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@@ -32,6 +32,8 @@ flowchart LR
|
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oa --> output
|
||||
```
|
||||
|
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<p class="nj-caption" markdown>Data flow through the library: input runs left to right through an input adapter and the lexer and parser (JSON text) or the `binary_reader` (binary formats) into SAX events, which build the value tree; the `serializer` or the `binary_writer` writes the tree to an output adapter.</p>
|
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|
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- **JSON text** is read by an [input adapter](#input-adapters), tokenized by the lexer, and turned into SAX events by
|
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the parser.
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- **Binary formats** (BJData, BON8, BSON, CBOR, MessagePack, UBJSON) are read by an input adapter and turned into the same SAX
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@@ -192,6 +194,8 @@ packet-beta
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96-127: "next"
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```
|
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|
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<p class="nj-caption" markdown>Layout of one 16-byte node of a JSON view index. Each row is 32 bits wide, and the numbers are the bit offsets of the fields `kind`, `flags`, `extra`, `off`, `len`, and `next`.</p>
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|
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| Bytes | Field | Type | Contents |
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|-------|---------|------------|-------------------------------------------------------------------------------------------------------------------------------|
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| 0 | `kind` | `uint8_t` | the type, numbered as [`value_t`](../api/basic_json/value_t.md): 0 null, 1 object, 2 array, 3 string, 4 boolean, 5 signed integer, 6 unsigned integer, 7 float; 10 for a link (see below). There is no node for a discarded value: a [discarded](../api/basic_json_view/is_discarded.md) view has none |
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@@ -201,6 +205,8 @@ packet-beta
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| 8-11 | `len` | `uint32_t` | strings: the length after decoding; floats and literals: the length of the token; arrays and objects: the number of elements |
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| 12-15 | `next` | `uint32_t` | arrays and objects: the number of nodes of the subtree, including the node itself |
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<p class="nj-table-caption" markdown>Fields of a node, by their byte offset within the 16-byte node. Integers use bytes 8-15 differently, see below.</p>
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||||
|
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- **Integers** keep their converted value in bytes 8-15 instead of `len` and `next`; the length of their token follows
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from the number of digits in `extra` (and the sign). Non-negative integers are unsigned integers, as with
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[`parse`](../api/basic_json/parse.md).
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@@ -234,6 +240,8 @@ flowchart LR
|
||||
n2 -. next .-> e
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```
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<p class="nj-caption" markdown>The five nodes of `#!json {"a": [1, 2.5]}` in document order. Solid arrows lead from each node to the one after it; dotted arrows show where `next` leads from the object and the array, past their subtrees.</p>
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|
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| Node | `kind` | `extra` | `off` | `len` | `next` |
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|------|----------------------|---------|-------|-------|--------|
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| 0 | 1 (object) | 0 | 0 | 1 | 5 |
|
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@@ -242,6 +250,8 @@ flowchart LR
|
||||
| 3 | 6 (unsigned integer) | 0x0001 | 7 | - | - |
|
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| 4 | 7 (float) | 0x0101 | 10 | 3 | 0 |
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<p class="nj-table-caption" markdown>Fields of the five nodes of `#!json {"a": [1, 2.5]}`. `off` is the byte offset in the text, and - marks the bytes 8-15 that hold the integer's value instead of `len` and `next`.</p>
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All `flags` are 0. The integer's bytes 8-15 hold its value, 1; its `extra` says it has one digit. The float's `extra`
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says it has one integer and one fraction digit, and its `len` is that of the token `2.5`.
|
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@@ -287,8 +297,9 @@ template<class T>
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std::size_t get_elements(T* dest, std::size_t count = 1);
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```
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|
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The lexer detects two optional extensions at compile time. Only `iterator_input_adapter` provides them, and only for
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random-access input of single-byte characters:
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The lexer detects two optional extensions at compile time. `iterator_input_adapter` provides both, and only for
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random-access input of single-byte characters. `input_stream_adapter` provides the second one (as a window onto the
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streambuf's buffer) unless `JSON_DISABLE_STREAM_BULK_SCAN` is defined:
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- `supports_seek`, `get_consumed_count()`, and `copy_consumed_range()` let the lexer reconstruct already consumed input
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for error messages instead of copying every character it reads. With `get_read_count()` and
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@@ -306,6 +317,40 @@ The function `input_adapter` picks the right adapter for the argument passed to
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- `input_stream_adapter` reads from a `std::istream`.
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- `file_input_adapter` reads from a `std::FILE*`.
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The adapters have no common base class: the lexer and the parser are templates on the adapter type, and
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`wide_string_input_adapter` wraps an `iterator_input_adapter`:
|
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|
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```mermaid
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classDiagram
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class input_adapter ["input adapter"] {
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<<concept>>
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+char_type
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+get_character() int_type
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+get_elements(T* dest, size_t count) size_t
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}
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class iterator_input_adapter {
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-IteratorType current
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-SentinelType end
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}
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class wide_string_input_adapter {
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-BaseInputAdapter base_adapter
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}
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class input_stream_adapter {
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-std::istream* is
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-std::streambuf* sb
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}
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class file_input_adapter {
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-std::FILE* m_file
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}
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input_adapter <|.. iterator_input_adapter
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input_adapter <|.. wide_string_input_adapter
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input_adapter <|.. input_stream_adapter
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input_adapter <|.. file_input_adapter
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wide_string_input_adapter o-- iterator_input_adapter : converts to UTF-8
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```
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<p class="nj-caption" markdown>The input adapters as a class diagram. The dotted arrows mean that each adapter implements the input adapter concept; the diamond shows that `wide_string_input_adapter` holds an `iterator_input_adapter`.</p>
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## SAX interface
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The parser does not build values itself. It reports what it reads as events to a [SAX](../features/parsing/sax_interface.md)
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@@ -321,6 +366,7 @@ The library comes with two consumers in `detail/input/json_sax.hpp`:
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The `binary_reader` emits the same events for binary formats, so [`sax_parse`](../api/basic_json/sax_parse.md) works
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with a user-defined consumer for JSON and for all binary formats alike.
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The [SAX event stepper](../features/parsing/sax_interface.md#sax-event-stepper) shows the events for a small input.
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## Output adapters
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@@ -339,6 +385,36 @@ The `serializer` (used by [`dump`](../api/basic_json/dump.md) and [`operator<<`]
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- `output_stream_adapter` writes to a `std::ostream`.
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- `output_string_adapter` appends to a string.
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They implement the abstract class `output_adapter_protocol`. The class `output_adapter` creates the one that matches
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its argument and holds it in a `std::shared_ptr` (`output_adapter_t`):
|
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|
||||
```mermaid
|
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classDiagram
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class output_adapter_protocol~CharType~ {
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<<interface>>
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+write_character(CharType c)*
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+write_characters(const CharType* s, size_t length)*
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}
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class output_vector_adapter {
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-std::vector& v
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}
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class output_stream_adapter {
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-std::basic_ostream& stream
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}
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class output_string_adapter {
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-StringType& str
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}
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class output_adapter {
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-output_adapter_t oa
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}
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output_adapter_protocol <|-- output_vector_adapter
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output_adapter_protocol <|-- output_stream_adapter
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output_adapter_protocol <|-- output_string_adapter
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output_adapter o-- output_adapter_protocol : shared_ptr
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||||
```
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|
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<p class="nj-caption" markdown>The output adapters as a class diagram. The three adapters derive from `output_adapter_protocol` (solid arrows), and `output_adapter` holds one of them through a `shared_ptr` (diamond).</p>
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|
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The `binary_writer` does not call an adapter for every byte. The `to_*` functions that return a `std::vector` write
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into the vector through a sink (`output_vector_sink`) that is not virtual. The functions that take an output adapter
|
||||
write through a sink (`output_adapter_sink`) that collects the output in a buffer of one kibibyte and passes it to the
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@@ -377,3 +453,14 @@ release. Besides the components above, it contains:
|
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- type traits to detect the capabilities of user-defined types (`detail/meta/type_traits.hpp`),
|
||||
- backports of C++14/17 features to C++11 (`detail/meta/cpp_future.hpp`), and
|
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- helpers such as `string_concat` and `string_escape`.
|
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|
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## See also
|
||||
|
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- [`basic_json`](../api/basic_json/index.md) - the main class and all its member functions
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- [`adl_serializer`](../api/adl_serializer/index.md) - customization point for type conversions
|
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- [`json_sax`](../api/json_sax/index.md) - interface of the SAX parser events
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- [SAX Interface](../features/parsing/sax_interface.md) - how to consume parser events without building a DOM
|
||||
- [Zero-copy JSON views](../features/json_view.md) - the flat node index that backs views and documents
|
||||
- [Template Parameter Requirements](../features/types/template_parameters.md) - the template parameters of basic_json
|
||||
- [Serialization](../features/serialization.md) - the output side of the library
|
||||
- [`nlohmann` Namespace](../features/namespace.md) - how the library namespace is structured
|
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@@ -1,4 +1,4 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/architecture/" rel="canonical"><link href=../design_goals/ rel=prev><link href=../customers/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Architecture - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#architecture class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Architecture </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-seaLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/architecture/" rel="canonical"><link href=../design_goals/ rel=prev><link href=../customers/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Architecture - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#architecture class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Architecture </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5Line truncated
|
||||
input[/"input<br>(string, stream,<br>iterator range, file)"/]
|
||||
ia["input adapter"]
|
||||
lexer["lexer"]
|
||||
@@ -17,7 +17,7 @@
|
||||
sax --> value
|
||||
value --> serializer --> oa
|
||||
value --> bwriter --> oa
|
||||
oa --> output</code></pre> <ul> <li><strong><abbr title="JavaScript Object Notation">JSON</abbr> text</strong> is read by an <a href=#input-adapters>input adapter</a>, tokenized by the lexer, and turned into <abbr title="Simple API for XML">SAX</abbr> events by the parser.</li> <li><strong>Binary formats</strong> (<abbr title="Binary JData">BJData</abbr>, <abbr title="Binary Object Notation 8">BON8</abbr>, <abbr title="Binary JSON">BSON</abbr>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, <abbr title="Universal Binary JSON">UBJSON</abbr>) are read by an input adapter and turned into the same <abbr title="Simple API for XML">SAX</abbr> events by the <code>binary_reader</code>.</li> <li>A <a href=#sax-interface><abbr title="Simple API for XML">SAX</abbr> consumer</a> receives the events. The one used by <a href=../../api/basic_json/parse/ ><code>parse</code></a> builds a <code>basic_json</code> value tree.</li> <li>The <code>serializer</code> (<abbr title="JavaScript Object Notation">JSON</abbr> text) or the <code>binary_writer</code> (binary formats) writes a value tree to an <a href=#output-adapters>output adapter</a>.</li> </ul> <h2 id=source-layout>Source layout<a class=headerlink href=#source-layout title="Permanent link">¶</a></h2> <p>The public headers are in <a href="https://github.com/nlohmann/json/tree/develop/include/nlohmann"><code>include/nlohmann</code></a>:</p> <ul> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/json.hpp"><code>json.hpp</code></a> defines class <a href=../../api/basic_json/ ><code>basic_json</code></a>.</li> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/json_fwd.hpp"><code>json_fwd.hpp</code></a> contains forward declarations.</li> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/adl_serializer.hpp"><code>adl_serializer.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/byte_container_with_subtype.hpp"><code>byte_container_with_subtype.hpp</code></a>, and <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/ordered_map.hpp"><code>ordered_map.hpp</code></a> define <a href=../../api/adl_serializer/ ><code>adl_serializer</code></a>, <a href=../../api/byte_container_with_subtype/ ><code>byte_container_with_subtype</code></a>, and <a href=../../api/ordered_map/ ><code>ordered_map</code></a>.</li> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/json_view.hpp"><code>json_view.hpp</code></a> is a separate, optional header that defines <a href=../../api/basic_json_document/ ><code>basic_json_document</code></a> and <a href=../../api/basic_json_view/ ><code>basic_json_view</code></a>, a flat-index, read-only, non-owning way to look at a parsed <abbr title="JavaScript Object Notation">JSON</abbr> text; see <a href=../../features/json_view/ >Zero-copy <abbr title="JavaScript Object Notation">JSON</abbr> views</a>. It builds on <code>json.hpp</code> internals (it requires the same library version) and has its own <code>detail/view/</code> subdirectory.</li> </ul> <p>Everything else lives in <a href="https://github.com/nlohmann/json/tree/develop/include/nlohmann/detail"><code>detail/</code></a> and namespace <code>nlohmann::detail</code>, which is not part of the public <abbr title="Application Programming Interface">API</abbr>. Paths below are relative to <code>include/nlohmann</code>.</p> <table> <thead> <tr> <th>Component</th> <th>Location</th> </tr> </thead> <tbody> <tr> <td>Value type enumeration</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/value_t.hpp"><code>detail/value_t.hpp</code></a></td> </tr> <tr> <td>Input adapters</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/input_adapters.hpp"><code>detail/input/input_adapters.hpp</code></a></td> </tr> <tr> <td>Lexer</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/lexer.hpp"><code>detail/input/lexer.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/number_parse.hpp"><code>detail/input/number_parse.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/string_scan.hpp"><code>detail/input/string_scan.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/simd_scan.hpp"><code>detail/input/simd_scan.hpp</code></a></td> </tr> <tr> <td>Parser</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/parser.hpp"><code>detail/input/parser.hpp</code></a></td> </tr> <tr> <td><abbr title="Simple API for XML">SAX</abbr> interface and <abbr title="Document Object Model">DOM</abbr> builders</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/json_sax.hpp"><code>detail/input/json_sax.hpp</code><Line truncated
|
||||
oa --> output</code></pre> <p class=nj-caption>Data flow through the library: input runs left to right through an input adapter and the lexer and parser (<abbr title="JavaScript Object Notation">JSON</abbr> text) or the <code>binary_reader</code> (binary formats) into <abbr title="Simple API for XML">SAX</abbr> events, which build the value tree; the <code>serializer</code> or the <code>binary_writer</code> writes the tree to an output adapter.</p> <ul> <li><strong><abbr title="JavaScript Object Notation">JSON</abbr> text</strong> is read by an <a href=#input-adapters>input adapter</a>, tokenized by the lexer, and turned into <abbr title="Simple API for XML">SAX</abbr> events by the parser.</li> <li><strong>Binary formats</strong> (<abbr title="Binary JData">BJData</abbr>, <abbr title="Binary Object Notation 8">BON8</abbr>, <abbr title="Binary JSON">BSON</abbr>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, <abbr title="Universal Binary JSON">UBJSON</abbr>) are read by an input adapter and turned into the same <abbr title="Simple API for XML">SAX</abbr> events by the <code>binary_reader</code>.</li> <li>A <a href=#sax-interface><abbr title="Simple API for XML">SAX</abbr> consumer</a> receives the events. The one used by <a href=../../api/basic_json/parse/ ><code>parse</code></a> builds a <code>basic_json</code> value tree.</li> <li>The <code>serializer</code> (<abbr title="JavaScript Object Notation">JSON</abbr> text) or the <code>binary_writer</code> (binary formats) writes a value tree to an <a href=#output-adapters>output adapter</a>.</li> </ul> <h2 id=source-layout>Source layout<a class=headerlink href=#source-layout title="Permanent link">¶</a></h2> <p>The public headers are in <a href="https://github.com/nlohmann/json/tree/develop/include/nlohmann"><code>include/nlohmann</code></a>:</p> <ul> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/json.hpp"><code>json.hpp</code></a> defines class <a href=../../api/basic_json/ ><code>basic_json</code></a>.</li> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/json_fwd.hpp"><code>json_fwd.hpp</code></a> contains forward declarations.</li> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/adl_serializer.hpp"><code>adl_serializer.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/byte_container_with_subtype.hpp"><code>byte_container_with_subtype.hpp</code></a>, and <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/ordered_map.hpp"><code>ordered_map.hpp</code></a> define <a href=../../api/adl_serializer/ ><code>adl_serializer</code></a>, <a href=../../api/byte_container_with_subtype/ ><code>byte_container_with_subtype</code></a>, and <a href=../../api/ordered_map/ ><code>ordered_map</code></a>.</li> <li><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/json_view.hpp"><code>json_view.hpp</code></a> is a separate, optional header that defines <a href=../../api/basic_json_document/ ><code>basic_json_document</code></a> and <a href=../../api/basic_json_view/ ><code>basic_json_view</code></a>, a flat-index, read-only, non-owning way to look at a parsed <abbr title="JavaScript Object Notation">JSON</abbr> text; see <a href=../../features/json_view/ >Zero-copy <abbr title="JavaScript Object Notation">JSON</abbr> views</a>. It builds on <code>json.hpp</code> internals (it requires the same library version) and has its own <code>detail/view/</code> subdirectory.</li> </ul> <p>Everything else lives in <a href="https://github.com/nlohmann/json/tree/develop/include/nlohmann/detail"><code>detail/</code></a> and namespace <code>nlohmann::detail</code>, which is not part of the public <abbr title="Application Programming Interface">API</abbr>. Paths below are relative to <code>include/nlohmann</code>.</p> <table> <thead> <tr> <th>Component</th> <th>Location</th> </tr> </thead> <tbody> <tr> <td>Value type enumeration</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/value_t.hpp"><code>detail/value_t.hpp</code></a></td> </tr> <tr> <td>Input adapters</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/input_adapters.hpp"><code>detail/input/input_adapters.hpp</code></a></td> </tr> <tr> <td>Lexer</td> <td><a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/lexer.hpp"><code>detail/input/lexer.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/number_parse.hpp"><code>detail/input/number_parse.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/string_scan.hpp"><code>detail/input/string_scan.hpp</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/input/simd_scan.hpp"><code>detail/input/simd_scan.hpp</code></a></td> </tr> <tr> <td>Parser</tLine truncated
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>/// the type of the current element</span>
|
||||
<span class=w> </span><span class=n>value_t</span><span class=w> </span><span class=n>m_type</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>value_t</span><span class=o>::</span><span class=n>null</span><span class=p>;</span>
|
||||
@@ -65,7 +65,7 @@
|
||||
16-31: "extra"
|
||||
32-63: "off"
|
||||
64-95: "len"
|
||||
96-127: "next"</code></pre> <table> <thead> <tr> <th>Bytes</th> <th>Field</th> <th>Type</th> <th>Contents</th> </tr> </thead> <tbody> <tr> <td>0</td> <td><code>kind</code></td> <td><code>uint8_t</code></td> <td>the type, numbered as <a href=../../api/basic_json/value_t/ ><code>value_t</code></a>: 0 null, 1 object, 2 array, 3 string, 4 boolean, 5 signed integer, 6 unsigned integer, 7 float; 10 for a link (see below). There is no node for a discarded value: a <a href=../../api/basic_json_view/is_discarded/ >discarded</a> view has none</td> </tr> <tr> <td>1</td> <td><code>flags</code></td> <td><code>uint8_t</code></td> <td>bits 0-1: where a string's bytes (or a number's token) are (0: the source text, 1: the buffer of decoded strings, for strings with escapes, 2: the edit buffer); bit 2: the value of a boolean; bit 3: moved, bit 4: new, bit 5: linked (see below)</td> </tr> <tr> <td>2-3</td> <td><code>extra</code></td> <td><code>uint16_t</code></td> <td>numbers: the number of integer digits (low byte) and fraction digits (high byte), 255 for more; objects: the number of their key hash index (1-based), or 0; otherwise 0</td> </tr> <tr> <td>4-7</td> <td><code>off</code></td> <td><code>uint32_t</code></td> <td>where the value starts: the first byte after a string's opening quote (or its position in the buffer of decoded strings), the first byte of a number or literal, the bracket of an array or object</td> </tr> <tr> <td>8-11</td> <td><code>len</code></td> <td><code>uint32_t</code></td> <td>strings: the length after decoding; floats and literals: the length of the token; arrays and objects: the number of elements</td> </tr> <tr> <td>12-15</td> <td><code>next</code></td> <td><code>uint32_t</code></td> <td>arrays and objects: the number of nodes of the subtree, including the node itself</td> </tr> </tbody> </table> <ul> <li><strong>Integers</strong> keep their converted value in bytes 8-15 instead of <code>len</code> and <code>next</code>; the length of their token follows from the number of digits in <code>extra</code> (and the sign). Non-negative integers are unsigned integers, as with <a href=../../api/basic_json/parse/ ><code>parse</code></a>.</li> <li><strong>Floats</strong> keep only their token. The digit layout in <code>extra</code> lets the conversion read the digits without scanning the token again, and only when the value is read.</li> <li><strong>Object members</strong> are the node of the key (a string) followed by the nodes of the value.</li> <li><strong>Navigation</strong> needs no pointers: the elements of an array or object follow its node, and the node after a value's subtree is <code>next</code> nodes further for an array or object, and the next node otherwise (<code>document_data::after</code>). Views step from element to element this way and skip whole subtrees in constant time.</li> <li><strong>Offsets</strong> are 32 bits wide, so a document is limited to 4294967279 bytes, 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> minus 16 bytes (a margin below 2^32 for positions one scanner step past the end of the text; <code>out_of_range.416</code>).</li> <li><strong>Large objects</strong> (128 members or more) get a hash index for their keys after parsing (<a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/object_index.hpp"><code>detail/view/object_index.hpp</code></a>): an open-addressing table whose slots hold the distance from the object's node to a key's node, so that a lookup does not compare every key. Of duplicate keys the table leads to the first, as a linear search does. The object's <code>extra</code> holds the number of its table. Only 65,535 tables fit into <code>extra</code>; objects beyond them are searched linearly.</li> </ul> <p>For example, <code class=highlight><span class=p>{</span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mf>2.5</span><span class=p>]}</span></code> becomes five nodes. Each node's elements follow it, and <code>next</code> leads from an array or object past its subtree:</p> <pre class=mermaid><code>flowchart LR
|
||||
96-127: "next"</code></pre> <p class=nj-caption>Layout of one 16-byte node of a <abbr title="JavaScript Object Notation">JSON</abbr> view index. Each row is 32 bits wide, and the numbers are the bit offsets of the fields <code>kind</code>, <code>flags</code>, <code>extra</code>, <code>off</code>, <code>len</code>, and <code>next</code>.</p> <table> <thead> <tr> <th>Bytes</th> <th>Field</th> <th>Type</th> <th>Contents</th> </tr> </thead> <tbody> <tr> <td>0</td> <td><code>kind</code></td> <td><code>uint8_t</code></td> <td>the type, numbered as <a href=../../api/basic_json/value_t/ ><code>value_t</code></a>: 0 null, 1 object, 2 array, 3 string, 4 boolean, 5 signed integer, 6 unsigned integer, 7 float; 10 for a link (see below). There is no node for a discarded value: a <a href=../../api/basic_json_view/is_discarded/ >discarded</a> view has none</td> </tr> <tr> <td>1</td> <td><code>flags</code></td> <td><code>uint8_t</code></td> <td>bits 0-1: where a string's bytes (or a number's token) are (0: the source text, 1: the buffer of decoded strings, for strings with escapes, 2: the edit buffer); bit 2: the value of a boolean; bit 3: moved, bit 4: new, bit 5: linked (see below)</td> </tr> <tr> <td>2-3</td> <td><code>extra</code></td> <td><code>uint16_t</code></td> <td>numbers: the number of integer digits (low byte) and fraction digits (high byte), 255 for more; objects: the number of their key hash index (1-based), or 0; otherwise 0</td> </tr> <tr> <td>4-7</td> <td><code>off</code></td> <td><code>uint32_t</code></td> <td>where the value starts: the first byte after a string's opening quote (or its position in the buffer of decoded strings), the first byte of a number or literal, the bracket of an array or object</td> </tr> <tr> <td>8-11</td> <td><code>len</code></td> <td><code>uint32_t</code></td> <td>strings: the length after decoding; floats and literals: the length of the token; arrays and objects: the number of elements</td> </tr> <tr> <td>12-15</td> <td><code>next</code></td> <td><code>uint32_t</code></td> <td>arrays and objects: the number of nodes of the subtree, including the node itself</td> </tr> </tbody> </table> <p class=nj-table-caption>Fields of a node, by their byte offset within the 16-byte node. Integers use bytes 8-15 differently, see below.</p> <ul> <li><strong>Integers</strong> keep their converted value in bytes 8-15 instead of <code>len</code> and <code>next</code>; the length of their token follows from the number of digits in <code>extra</code> (and the sign). Non-negative integers are unsigned integers, as with <a href=../../api/basic_json/parse/ ><code>parse</code></a>.</li> <li><strong>Floats</strong> keep only their token. The digit layout in <code>extra</code> lets the conversion read the digits without scanning the token again, and only when the value is read.</li> <li><strong>Object members</strong> are the node of the key (a string) followed by the nodes of the value.</li> <li><strong>Navigation</strong> needs no pointers: the elements of an array or object follow its node, and the node after a value's subtree is <code>next</code> nodes further for an array or object, and the next node otherwise (<code>document_data::after</code>). Views step from element to element this way and skip whole subtrees in constant time.</li> <li><strong>Offsets</strong> are 32 bits wide, so a document is limited to 4294967279 bytes, 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> minus 16 bytes (a margin below 2^32 for positions one scanner step past the end of the text; <code>out_of_range.416</code>).</li> <li><strong>Large objects</strong> (128 members or more) get a hash index for their keys after parsing (<a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/object_index.hpp"><code>detail/view/object_index.hpp</code></a>): an open-addressing table whose slots hold the distance from the object's node to a key's node, so that a lookup does not compare every key. Of duplicate keys the table leads to the first, as a linear search does. The object's <code>extra</code> holds the number of its table. Only 65,535 tables fit into <code>extra</code>; objects beyond them are searched linearly.</li> </ul> <p>For example, <code class=highlight><span class=p>{</span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mf>2.5</span><span class=p>]}</span></code> becomes five nodes. Each node's elements follow it, and <code>next</code> leads from an array or object past its subtree:</p> <pre class=mermaid><code>flowchart LR
|
||||
n0["0: object<br>len 1, next 5"]
|
||||
n1["1: key a"]
|
||||
n2["2: array<br>len 2, next 3"]
|
||||
@@ -74,7 +74,7 @@
|
||||
e(["end"])
|
||||
n0 --> n1 --> n2 --> n3 --> n4 --> e
|
||||
n0 -. next .-> e
|
||||
n2 -. next .-> e</code></pre> <table> <thead> <tr> <th>Node</th> <th><code>kind</code></th> <th><code>extra</code></th> <th><code>off</code></th> <th><code>len</code></th> <th><code>next</code></th> </tr> </thead> <tbody> <tr> <td>0</td> <td>1 (object)</td> <td>0</td> <td>0</td> <td>1</td> <td>5</td> </tr> <tr> <td>1</td> <td>3 (string)</td> <td>0</td> <td>2</td> <td>1</td> <td>0</td> </tr> <tr> <td>2</td> <td>2 (array)</td> <td>0</td> <td>6</td> <td>2</td> <td>3</td> </tr> <tr> <td>3</td> <td>6 (unsigned integer)</td> <td>0x0001</td> <td>7</td> <td>-</td> <td>-</td> </tr> <tr> <td>4</td> <td>7 (float)</td> <td>0x0101</td> <td>10</td> <td>3</td> <td>0</td> </tr> </tbody> </table> <p>All <code>flags</code> are 0. The integer's bytes 8-15 hold its value, 1; its <code>extra</code> says it has one digit. The float's <code>extra</code> says it has one integer and one fraction digit, and its <code>len</code> is that of the token <code>2.5</code>.</p> <p>Editable documents (<a href=../../api/json_editable_document/ ><code>json_editable_document</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/edit.hpp"><code>detail/view/edit.hpp</code></a> and <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/edit_storage.hpp"><code>detail/view/edit_storage.hpp</code></a>) never write the source text and never move or resize the parsed index, so views stay valid while the document is edited:</p> <ul> <li>A new scalar is written over its node. Its text (a string, or the token of a number as <code>dump()</code> writes it) goes to the edit buffer, which <code>flags</code> bits 0-1 then name.</li> <li>An array or object whose elements change gets the flag <em>moved</em> (bit 3): its elements then live in a separate sequence (a header node, then the entries), whose number is in <code>off</code>. The entries are links (<code>kind</code> 10), whose bytes 8-15 hold the address of the value's node, so values never move.</li> <li>A node written by an edit gets the flag <em>new</em> (bit 4): it has no position in the source text.</li> <li>A value that an entry of such a sequence links to gets the flag <em>linked</em> (bit 5): its extent in the parsed layout (<code>next</code>) no longer matters, so a scalar can replace an array or object there in place.</li> <li>Views of read-only documents compile without any of this: how views walk the index is a template parameter (<code>navigation<Editable></code>).</li> </ul> <p>Images (<a href=../../api/basic_json_document/save/ ><code>save</code></a> and <a href=../../api/basic_json_document/load/ ><code>load</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/image.hpp"><code>detail/view/image.hpp</code></a>) store the nodes as they are: a 64-byte header (the magic bytes <code>NJVI</code>, a format version, the sizes, and reserved bytes that must be zero), the nodes, the text, and the decoded strings. An edited document is first written in document order, as the parser would have written it (without links), and the numbers of the hash indexes are cleared, since <code>load</code> rebuilds the indexes. So a change of the node layout is a change of the image format: it must raise <code>image_version</code>, and <code>load</code> then rejects images of other versions (<code>parse_error.116</code>) instead of misreading them.</p> <h2 id=input-adapters>Input adapters<a class=headerlink href=#input-adapters title="Permanent link">¶</a></h2> <p>Input is read via <strong>input adapters</strong> that abstract a source. Every input adapter provides this interface:</p> <div class=highlight><pre><span></span><code><span class=c1>/// the type of the characters in the input</span>
|
||||
n2 -. next .-> e</code></pre> <p class=nj-caption>The five nodes of <code class=highlight><span class=p>{</span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mf>2.5</span><span class=p>]}</span></code> in document order. Solid arrows lead from each node to the one after it; dotted arrows show where <code>next</code> leads from the object and the array, past their subtrees.</p> <table> <thead> <tr> <th>Node</th> <th><code>kind</code></th> <th><code>extra</code></th> <th><code>off</code></th> <th><code>len</code></th> <th><code>next</code></th> </tr> </thead> <tbody> <tr> <td>0</td> <td>1 (object)</td> <td>0</td> <td>0</td> <td>1</td> <td>5</td> </tr> <tr> <td>1</td> <td>3 (string)</td> <td>0</td> <td>2</td> <td>1</td> <td>0</td> </tr> <tr> <td>2</td> <td>2 (array)</td> <td>0</td> <td>6</td> <td>2</td> <td>3</td> </tr> <tr> <td>3</td> <td>6 (unsigned integer)</td> <td>0x0001</td> <td>7</td> <td>-</td> <td>-</td> </tr> <tr> <td>4</td> <td>7 (float)</td> <td>0x0101</td> <td>10</td> <td>3</td> <td>0</td> </tr> </tbody> </table> <p class=nj-table-caption>Fields of the five nodes of <code class=highlight><span class=p>{</span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mf>2.5</span><span class=p>]}</span></code>. <code>off</code> is the byte offset in the text, and - marks the bytes 8-15 that hold the integer's value instead of <code>len</code> and <code>next</code>.</p> <p>All <code>flags</code> are 0. The integer's bytes 8-15 hold its value, 1; its <code>extra</code> says it has one digit. The float's <code>extra</code> says it has one integer and one fraction digit, and its <code>len</code> is that of the token <code>2.5</code>.</p> <p>Editable documents (<a href=../../api/json_editable_document/ ><code>json_editable_document</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/edit.hpp"><code>detail/view/edit.hpp</code></a> and <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/edit_storage.hpp"><code>detail/view/edit_storage.hpp</code></a>) never write the source text and never move or resize the parsed index, so views stay valid while the document is edited:</p> <ul> <li>A new scalar is written over its node. Its text (a string, or the token of a number as <code>dump()</code> writes it) goes to the edit buffer, which <code>flags</code> bits 0-1 then name.</li> <li>An array or object whose elements change gets the flag <em>moved</em> (bit 3): its elements then live in a separate sequence (a header node, then the entries), whose number is in <code>off</code>. The entries are links (<code>kind</code> 10), whose bytes 8-15 hold the address of the value's node, so values never move.</li> <li>A node written by an edit gets the flag <em>new</em> (bit 4): it has no position in the source text.</li> <li>A value that an entry of such a sequence links to gets the flag <em>linked</em> (bit 5): its extent in the parsed layout (<code>next</code>) no longer matters, so a scalar can replace an array or object there in place.</li> <li>Views of read-only documents compile without any of this: how views walk the index is a template parameter (<code>navigation<Editable></code>).</li> </ul> <p>Images (<a href=../../api/basic_json_document/save/ ><code>save</code></a> and <a href=../../api/basic_json_document/load/ ><code>load</code></a>, <a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/image.hpp"><code>detail/view/image.hpp</code></a>) store the nodes as they are: a 64-byte header (the magic bytes <code>NJVI</code>, a format version, the sizes, and reserved bytes that must be zero), the nodes, the text, and the decoded strings. An edited document is first written in document order, as the parser would have written it (without links), and the numbers of the hash indexes are cleared, since <code>load</code> rebuilds the indexes. So a change of the node layout is a change of the image format: it must raise <code>image_version</code>, and <code>load</code> then rejects images of other versions (<code>parse_error.116</code>) instead of misreading them.</p> <h2 id=input-adapters>Input adapters<a class=headerlink href=#input-adapters title="Permanent link">¶</a></h2> <p>Input is read via <strong>input adapters</strong> that abstract a source. Every input adapter provides this interface:</p> <div class=highlight><pre><span></span><code><span class=c1>/// the type of the characters in the input</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>char_type</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>...;</span>
|
||||
|
||||
<span class=c1>/// read a single character; returns std::char_traits<char_type>::eof() at the end of the input</span>
|
||||
@@ -84,12 +84,58 @@
|
||||
<span class=c1>/// (used by the binary readers)</span>
|
||||
<span class=k>template</span><span class=o><</span><span class=k>class</span><span class=w> </span><span class=nc>T</span><span class=o>></span>
|
||||
<span class=n>std</span><span class=o>::</span><span class=kt>size_t</span><span class=w> </span><span class=n>get_elements</span><span class=p>(</span><span class=n>T</span><span class=o>*</span><span class=w> </span><span class=n>dest</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=kt>size_t</span><span class=w> </span><span class=n>count</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>1</span><span class=p>);</span>
|
||||
</code></pre></div> <p>The lexer detects two optional extensions at compile time. Only <code>iterator_input_adapter</code> provides them, and only for random-access input of single-byte characters:</p> <ul> <li><code>supports_seek</code>, <code>get_consumed_count()</code>, and <code>copy_consumed_range()</code> let the lexer reconstruct already consumed input for error messages instead of copying every character it reads. With <code>get_read_count()</code> and <code>count_consumed_lines()</code>, the lexer also derives the read position from the adapter and counts lines only when an error needs them, instead of counting characters and lines on every read.</li> <li><code>supports_bulk_scan</code>, <code>bulk_data()</code>, <code>bulk_remaining()</code>, and <code>bulk_skip()</code> let the lexer scan strings directly in contiguous memory, several bytes at a time, and skip the spaces that indent a line in 8-byte steps.</li> </ul> <p>The function <code>input_adapter</code> picks the right adapter for the argument passed to <code>parse</code>, <code>accept</code>, <code>sax_parse</code>, or the <code>from_*</code> functions:</p> <ul> <li><code>iterator_input_adapter</code> reads from an iterator range, which also covers strings, containers, and pointers.</li> <li><code>wide_string_input_adapter</code> reads from ranges of <code>wchar_t</code>, <code>char16_t</code>, or <code>char32_t</code> and converts them to <abbr title="Unicode Transformation Format">UTF</abbr>-8. It cannot be used for binary formats; its <code>get_elements()</code> throws.</li> <li><code>input_stream_adapter</code> reads from a <code>std::istream</code>.</li> <li><code>file_input_adapter</code> reads from a <code>std::FILE*</code>.</li> </ul> <h2 id=sax-interface><abbr title="Simple API for XML">SAX</abbr> interface<a class=headerlink href=#sax-interface title="Permanent link">¶</a></h2> <p>The parser does not build values itself. It reports what it reads as events to a <a href=../../features/parsing/sax_interface/ ><abbr title="Simple API for XML">SAX</abbr></a> consumer, which implements the interface <a href=../../api/json_sax/ ><code>json_sax</code></a>: <code>null</code>, <code>boolean</code>, <code>number_integer</code>, <code>number_unsigned</code>, <code>number_float</code>, <code>string</code>, <code>binary</code>, <code>start_object</code>, <code>key</code>, <code>end_object</code>, <code>start_array</code>, <code>end_array</code>, and <code>parse_error</code>.</p> <p>The library comes with two consumers in <code>detail/input/json_sax.hpp</code>:</p> <ul> <li><code>json_sax_dom_parser</code> builds a <a href=../../api/basic_json/ ><code>basic_json</code></a> value tree. <a href=../../api/basic_json/parse/ ><code>parse</code></a> uses it.</li> <li><code>json_sax_dom_callback_parser</code> does the same, but calls a <a href=../../features/parsing/parser_callbacks/ >parser callback</a> for each event, which can skip values. <code>parse</code> uses it when a callback is given.</li> </ul> <p>The <code>binary_reader</code> emits the same events for binary formats, so <a href=../../api/basic_json/sax_parse/ ><code>sax_parse</code></a> works with a user-defined consumer for <abbr title="JavaScript Object Notation">JSON</abbr> and for all binary formats alike.</p> <h2 id=output-adapters>Output adapters<a class=headerlink href=#output-adapters title="Permanent link">¶</a></h2> <p>Output is written via <strong>output adapters</strong>:</p> <div class=highlight><pre><span></span><code><span class=kt>void</span><span class=w> </span><span class=nf>write_character</span><span class=p>(</span><span class=n>CharType</span><span class=w> </span><span class=n>c</span><span class=p>);</span>
|
||||
</code></pre></div> <p>The lexer detects two optional extensions at compile time. <code>iterator_input_adapter</code> provides both, and only for random-access input of single-byte characters. <code>input_stream_adapter</code> provides the second one (as a window onto the streambuf's buffer) unless <code>JSON_DISABLE_STREAM_BULK_SCAN</code> is defined:</p> <ul> <li><code>supports_seek</code>, <code>get_consumed_count()</code>, and <code>copy_consumed_range()</code> let the lexer reconstruct already consumed input for error messages instead of copying every character it reads. With <code>get_read_count()</code> and <code>count_consumed_lines()</code>, the lexer also derives the read position from the adapter and counts lines only when an error needs them, instead of counting characters and lines on every read.</li> <li><code>supports_bulk_scan</code>, <code>bulk_data()</code>, <code>bulk_remaining()</code>, and <code>bulk_skip()</code> let the lexer scan strings directly in contiguous memory, several bytes at a time, and skip the spaces that indent a line in 8-byte steps.</li> </ul> <p>The function <code>input_adapter</code> picks the right adapter for the argument passed to <code>parse</code>, <code>accept</code>, <code>sax_parse</code>, or the <code>from_*</code> functions:</p> <ul> <li><code>iterator_input_adapter</code> reads from an iterator range, which also covers strings, containers, and pointers.</li> <li><code>wide_string_input_adapter</code> reads from ranges of <code>wchar_t</code>, <code>char16_t</code>, or <code>char32_t</code> and converts them to <abbr title="Unicode Transformation Format">UTF</abbr>-8. It cannot be used for binary formats; its <code>get_elements()</code> throws.</li> <li><code>input_stream_adapter</code> reads from a <code>std::istream</code>.</li> <li><code>file_input_adapter</code> reads from a <code>std::FILE*</code>.</li> </ul> <p>The adapters have no common base class: the lexer and the parser are templates on the adapter type, and <code>wide_string_input_adapter</code> wraps an <code>iterator_input_adapter</code>:</p> <pre class=mermaid><code>classDiagram
|
||||
class input_adapter ["input adapter"] {
|
||||
<<concept>>
|
||||
+char_type
|
||||
+get_character() int_type
|
||||
+get_elements(T* dest, size_t count) size_t
|
||||
}
|
||||
class iterator_input_adapter {
|
||||
-IteratorType current
|
||||
-SentinelType end
|
||||
}
|
||||
class wide_string_input_adapter {
|
||||
-BaseInputAdapter base_adapter
|
||||
}
|
||||
class input_stream_adapter {
|
||||
-std::istream* is
|
||||
-std::streambuf* sb
|
||||
}
|
||||
class file_input_adapter {
|
||||
-std::FILE* m_file
|
||||
}
|
||||
input_adapter <|.. iterator_input_adapter
|
||||
input_adapter <|.. wide_string_input_adapter
|
||||
input_adapter <|.. input_stream_adapter
|
||||
input_adapter <|.. file_input_adapter
|
||||
wide_string_input_adapter o-- iterator_input_adapter : converts to UTF-8</code></pre> <p class=nj-caption>The input adapters as a class diagram. The dotted arrows mean that each adapter implements the input adapter concept; the diamond shows that <code>wide_string_input_adapter</code> holds an <code>iterator_input_adapter</code>.</p> <h2 id=sax-interface><abbr title="Simple API for XML">SAX</abbr> interface<a class=headerlink href=#sax-interface title="Permanent link">¶</a></h2> <p>The parser does not build values itself. It reports what it reads as events to a <a href=../../features/parsing/sax_interface/ ><abbr title="Simple API for XML">SAX</abbr></a> consumer, which implements the interface <a href=../../api/json_sax/ ><code>json_sax</code></a>: <code>null</code>, <code>boolean</code>, <code>number_integer</code>, <code>number_unsigned</code>, <code>number_float</code>, <code>string</code>, <code>binary</code>, <code>start_object</code>, <code>key</code>, <code>end_object</code>, <code>start_array</code>, <code>end_array</code>, and <code>parse_error</code>.</p> <p>The library comes with two consumers in <code>detail/input/json_sax.hpp</code>:</p> <ul> <li><code>json_sax_dom_parser</code> builds a <a href=../../api/basic_json/ ><code>basic_json</code></a> value tree. <a href=../../api/basic_json/parse/ ><code>parse</code></a> uses it.</li> <li><code>json_sax_dom_callback_parser</code> does the same, but calls a <a href=../../features/parsing/parser_callbacks/ >parser callback</a> for each event, which can skip values. <code>parse</code> uses it when a callback is given.</li> </ul> <p>The <code>binary_reader</code> emits the same events for binary formats, so <a href=../../api/basic_json/sax_parse/ ><code>sax_parse</code></a> works with a user-defined consumer for <abbr title="JavaScript Object Notation">JSON</abbr> and for all binary formats alike. The <a href=../../features/parsing/sax_interface/#sax-event-stepper><abbr title="Simple API for XML">SAX</abbr> event stepper</a> shows the events for a small input.</p> <h2 id=output-adapters>Output adapters<a class=headerlink href=#output-adapters title="Permanent link">¶</a></h2> <p>Output is written via <strong>output adapters</strong>:</p> <div class=highlight><pre><span></span><code><span class=kt>void</span><span class=w> </span><span class=nf>write_character</span><span class=p>(</span><span class=n>CharType</span><span class=w> </span><span class=n>c</span><span class=p>);</span>
|
||||
|
||||
<span class=kt>void</span><span class=w> </span><span class=nf>write_characters</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>CharType</span><span class=o>*</span><span class=w> </span><span class=n>s</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=kt>size_t</span><span class=w> </span><span class=n>length</span><span class=p>);</span>
|
||||
</code></pre></div> <p>The <code>serializer</code> (used by <a href=../../api/basic_json/dump/ ><code>dump</code></a> and <a href=../../api/operator_ltlt/ ><code>operator<<</code></a>) and the <code>binary_writer</code> (used by the <code>to_*</code> functions) write to one of these adapters:</p> <ul> <li><code>output_vector_adapter</code> appends to a <code>std::vector</code>.</li> <li><code>output_stream_adapter</code> writes to a <code>std::ostream</code>.</li> <li><code>output_string_adapter</code> appends to a string.</li> </ul> <p>The <code>binary_writer</code> does not call an adapter for every byte. The <code>to_*</code> functions that return a <code>std::vector</code> write into the vector through a sink (<code>output_vector_sink</code>) that is not virtual. The functions that take an output adapter write through a sink (<code>output_adapter_sink</code>) that collects the output in a buffer of one kibibyte and passes it to the adapter in blocks, so that the adapter is called (and a stream locked) once per block instead of once per value.</p> <h2 id=value-conversion>Value conversion<a class=headerlink href=#value-conversion title="Permanent link">¶</a></h2> <p>Values are converted from and to other types with the <code>JSONSerializer</code> template parameter. The default, <a href=../../api/adl_serializer/ ><code>adl_serializer</code></a>, calls the free functions</p> <div class=highlight><pre><span></span><code><span class=k>template</span><span class=o><</span><span class=k>class</span><span class=w> </span><span class=nc>T</span><span class=o>></span>
|
||||
</code></pre></div> <p>The <code>serializer</code> (used by <a href=../../api/basic_json/dump/ ><code>dump</code></a> and <a href=../../api/operator_ltlt/ ><code>operator<<</code></a>) and the <code>binary_writer</code> (used by the <code>to_*</code> functions) write to one of these adapters:</p> <ul> <li><code>output_vector_adapter</code> appends to a <code>std::vector</code>.</li> <li><code>output_stream_adapter</code> writes to a <code>std::ostream</code>.</li> <li><code>output_string_adapter</code> appends to a string.</li> </ul> <p>They implement the abstract class <code>output_adapter_protocol</code>. The class <code>output_adapter</code> creates the one that matches its argument and holds it in a <code>std::shared_ptr</code> (<code>output_adapter_t</code>):</p> <pre class=mermaid><code>classDiagram
|
||||
class output_adapter_protocol~CharType~ {
|
||||
<<interface>>
|
||||
+write_character(CharType c)*
|
||||
+write_characters(const CharType* s, size_t length)*
|
||||
}
|
||||
class output_vector_adapter {
|
||||
-std::vector& v
|
||||
}
|
||||
class output_stream_adapter {
|
||||
-std::basic_ostream& stream
|
||||
}
|
||||
class output_string_adapter {
|
||||
-StringType& str
|
||||
}
|
||||
class output_adapter {
|
||||
-output_adapter_t oa
|
||||
}
|
||||
output_adapter_protocol <|-- output_vector_adapter
|
||||
output_adapter_protocol <|-- output_stream_adapter
|
||||
output_adapter_protocol <|-- output_string_adapter
|
||||
output_adapter o-- output_adapter_protocol : shared_ptr</code></pre> <p class=nj-caption>The output adapters as a class diagram. The three adapters derive from <code>output_adapter_protocol</code> (solid arrows), and <code>output_adapter</code> holds one of them through a <code>shared_ptr</code> (diamond).</p> <p>The <code>binary_writer</code> does not call an adapter for every byte. The <code>to_*</code> functions that return a <code>std::vector</code> write into the vector through a sink (<code>output_vector_sink</code>) that is not virtual. The functions that take an output adapter write through a sink (<code>output_adapter_sink</code>) that collects the output in a buffer of one kibibyte and passes it to the adapter in blocks, so that the adapter is called (and a stream locked) once per block instead of once per value.</p> <h2 id=value-conversion>Value conversion<a class=headerlink href=#value-conversion title="Permanent link">¶</a></h2> <p>Values are converted from and to other types with the <code>JSONSerializer</code> template parameter. The default, <a href=../../api/adl_serializer/ ><code>adl_serializer</code></a>, calls the free functions</p> <div class=highlight><pre><span></span><code><span class=k>template</span><span class=o><</span><span class=k>class</span><span class=w> </span><span class=nc>T</span><span class=o>></span>
|
||||
<span class=kt>void</span><span class=w> </span><span class=n>to_json</span><span class=p>(</span><span class=n>basic_json</span><span class=o>&</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>T</span><span class=o>&</span><span class=w> </span><span class=n>t</span><span class=p>);</span>
|
||||
|
||||
<span class=k>template</span><span class=o><</span><span class=k>class</span><span class=w> </span><span class=nc>T</span><span class=o>></span>
|
||||
<span class=kt>void</span><span class=w> </span><span class=n>from_json</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>basic_json</span><span class=o>&</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=n>T</span><span class=o>&</span><span class=w> </span><span class=n>t</span><span class=p>);</span>
|
||||
</code></pre></div> <p>found by argument-dependent lookup. The library defines them for standard types in <code>detail/conversions</code>; users add them for their own types, see <a href=../../features/arbitrary_types/ >Arbitrary Type Conversions</a>. The <a href=../../features/macros/ >serialization macros</a> generate these functions.</p> <h2 id=additional-features>Additional features<a class=headerlink href=#additional-features title="Permanent link">¶</a></h2> <ul> <li><a href=../../features/json_pointer/ ><abbr title="JavaScript Object Notation">JSON</abbr> Pointer</a> (class <code>json_pointer</code>) addresses values inside a tree. It is also the basis of <a href=../../features/json_patch/ ><abbr title="JavaScript Object Notation">JSON</abbr> Patch</a>.</li> <li><a href=../../features/binary_formats/ >Binary formats</a> are read by <code>binary_reader</code> and written by <code>binary_writer</code>.</li> <li>A <a href=../../api/basic_json/json_base_class_t/ >custom base class</a> can add members to every <a href=../../api/basic_json/ ><code>basic_json</code></a> value.</li> <li><a href=../../features/macros/ >Serialization macros</a> generate <code>to_json</code> and <code>from_json</code> functions for user-defined types.</li> </ul> <h2 id=details-namespace>Details namespace<a class=headerlink href=#details-namespace title="Permanent link">¶</a></h2> <p>Namespace <code>nlohmann::detail</code> contains all implementation details. It is not part of the public <abbr title="Application Programming Interface">API</abbr> and may change in any release. Besides the components above, it contains:</p> <ul> <li>type traits to detect the capabilities of user-defined types (<code>detail/meta/type_traits.hpp</code>),</li> <li>backports of C++14/17 features to C++11 (<code>detail/meta/cpp_future.hpp</code>), and</li> <li>helpers such as <code>string_concat</code> and <code>string_escape</code>.</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 23, 2026 04:52:58 UTC">October 23, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 5Line truncated
|
||||
</code></pre></div> <p>found by argument-dependent lookup. The library defines them for standard types in <code>detail/conversions</code>; users add them for their own types, see <a href=../../features/arbitrary_types/ >Arbitrary Type Conversions</a>. The <a href=../../features/macros/ >serialization macros</a> generate these functions.</p> <h2 id=additional-features>Additional features<a class=headerlink href=#additional-features title="Permanent link">¶</a></h2> <ul> <li><a href=../../features/json_pointer/ ><abbr title="JavaScript Object Notation">JSON</abbr> Pointer</a> (class <code>json_pointer</code>) addresses values inside a tree. It is also the basis of <a href=../../features/json_patch/ ><abbr title="JavaScript Object Notation">JSON</abbr> Patch</a>.</li> <li><a href=../../features/binary_formats/ >Binary formats</a> are read by <code>binary_reader</code> and written by <code>binary_writer</code>.</li> <li>A <a href=../../api/basic_json/json_base_class_t/ >custom base class</a> can add members to every <a href=../../api/basic_json/ ><code>basic_json</code></a> value.</li> <li><a href=../../features/macros/ >Serialization macros</a> generate <code>to_json</code> and <code>from_json</code> functions for user-defined types.</li> </ul> <h2 id=details-namespace>Details namespace<a class=headerlink href=#details-namespace title="Permanent link">¶</a></h2> <p>Namespace <code>nlohmann::detail</code> contains all implementation details. It is not part of the public <abbr title="Application Programming Interface">API</abbr> and may change in any release. Besides the components above, it contains:</p> <ul> <li>type traits to detect the capabilities of user-defined types (<code>detail/meta/type_traits.hpp</code>),</li> <li>backports of C++14/17 features to C++11 (<code>detail/meta/cpp_future.hpp</code>), and</li> <li>helpers such as <code>string_concat</code> and <code>string_escape</code>.</li> </ul> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../api/basic_json/ ><code>basic_json</code></a> - the main class and all its member functions</li> <li><a href=../../api/adl_serializer/ ><code>adl_serializer</code></a> - customization point for type conversions</li> <li><a href=../../api/json_sax/ ><code>json_sax</code></a> - interface of the <abbr title="Simple API for XML">SAX</abbr> parser events</li> <li><a href=../../features/parsing/sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> Interface</a> - how to consume parser events without building a <abbr title="Document Object Model">DOM</abbr></li> <li><a href=../../features/json_view/ >Zero-copy <abbr title="JavaScript Object Notation">JSON</abbr> views</a> - the flat node index that backs views and documents</li> <li><a href=../../features/types/template_parameters/ >Template Parameter Requirements</a> - the template parameters of basic_json</li> <li><a href=../../features/serialization/ >Serialization</a> - the output side of the library</li> <li><a href=../../features/namespace/ ><code>nlohmann</code> Namespace</a> - how the library namespace is structured</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 27, 2026 06:41:42 UTC">October 27, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../design_goals/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Design goals"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 Line truncated
|
||||
@@ -29,6 +29,8 @@ flowchart LR
|
||||
oa --> output
|
||||
```
|
||||
|
||||
Data flow through the library: input runs left to right through an input adapter and the lexer and parser (JSON text) or the `binary_reader` (binary formats) into SAX events, which build the value tree; the `serializer` or the `binary_writer` writes the tree to an output adapter.
|
||||
|
||||
- **JSON text** is read by an [input adapter](#input-adapters), tokenized by the lexer, and turned into SAX events by the parser.
|
||||
- **Binary formats** (BJData, BON8, BSON, CBOR, MessagePack, UBJSON) are read by an input adapter and turned into the same SAX events by the `binary_reader`.
|
||||
- A [SAX consumer](#sax-interface) receives the events. The one used by [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md) builds a `basic_json` value tree.
|
||||
@@ -160,6 +162,8 @@ packet-beta
|
||||
96-127: "next"
|
||||
```
|
||||
|
||||
Layout of one 16-byte node of a JSON view index. Each row is 32 bits wide, and the numbers are the bit offsets of the fields `kind`, `flags`, `extra`, `off`, `len`, and `next`.
|
||||
|
||||
| Bytes | Field | Type | Contents |
|
||||
| ----- | ------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| 0 | `kind` | `uint8_t` | the type, numbered as [`value_t`](https://json.nlohmann.me/api/basic_json/value_t/index.md): 0 null, 1 object, 2 array, 3 string, 4 boolean, 5 signed integer, 6 unsigned integer, 7 float; 10 for a link (see below). There is no node for a discarded value: a [discarded](https://json.nlohmann.me/api/basic_json_view/is_discarded/index.md) view has none |
|
||||
@@ -169,6 +173,8 @@ packet-beta
|
||||
| 8-11 | `len` | `uint32_t` | strings: the length after decoding; floats and literals: the length of the token; arrays and objects: the number of elements |
|
||||
| 12-15 | `next` | `uint32_t` | arrays and objects: the number of nodes of the subtree, including the node itself |
|
||||
|
||||
Fields of a node, by their byte offset within the 16-byte node. Integers use bytes 8-15 differently, see below.
|
||||
|
||||
- **Integers** keep their converted value in bytes 8-15 instead of `len` and `next`; the length of their token follows from the number of digits in `extra` (and the sign). Non-negative integers are unsigned integers, as with [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md).
|
||||
- **Floats** keep only their token. The digit layout in `extra` lets the conversion read the digits without scanning the token again, and only when the value is read.
|
||||
- **Object members** are the node of the key (a string) followed by the nodes of the value.
|
||||
@@ -191,6 +197,8 @@ flowchart LR
|
||||
n2 -. next .-> e
|
||||
```
|
||||
|
||||
The five nodes of `{"a": [1, 2.5]}` in document order. Solid arrows lead from each node to the one after it; dotted arrows show where `next` leads from the object and the array, past their subtrees.
|
||||
|
||||
| Node | `kind` | `extra` | `off` | `len` | `next` |
|
||||
| ---- | -------------------- | ------- | ----- | ----- | ------ |
|
||||
| 0 | 1 (object) | 0 | 0 | 1 | 5 |
|
||||
@@ -199,6 +207,8 @@ flowchart LR
|
||||
| 3 | 6 (unsigned integer) | 0x0001 | 7 | - | - |
|
||||
| 4 | 7 (float) | 0x0101 | 10 | 3 | 0 |
|
||||
|
||||
Fields of the five nodes of `{"a": [1, 2.5]}`. `off` is the byte offset in the text, and - marks the bytes 8-15 that hold the integer's value instead of `len` and `next`.
|
||||
|
||||
All `flags` are 0. The integer's bytes 8-15 hold its value, 1; its `extra` says it has one digit. The float's `extra` says it has one integer and one fraction digit, and its `len` is that of the token `2.5`.
|
||||
|
||||
Editable documents ([`json_editable_document`](https://json.nlohmann.me/api/json_editable_document/index.md), [`detail/view/edit.hpp`](https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/edit.hpp) and [`detail/view/edit_storage.hpp`](https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/edit_storage.hpp)) never write the source text and never move or resize the parsed index, so views stay valid while the document is edited:
|
||||
@@ -228,7 +238,7 @@ template<class T>
|
||||
std::size_t get_elements(T* dest, std::size_t count = 1);
|
||||
```
|
||||
|
||||
The lexer detects two optional extensions at compile time. Only `iterator_input_adapter` provides them, and only for random-access input of single-byte characters:
|
||||
The lexer detects two optional extensions at compile time. `iterator_input_adapter` provides both, and only for random-access input of single-byte characters. `input_stream_adapter` provides the second one (as a window onto the streambuf's buffer) unless `JSON_DISABLE_STREAM_BULK_SCAN` is defined:
|
||||
|
||||
- `supports_seek`, `get_consumed_count()`, and `copy_consumed_range()` let the lexer reconstruct already consumed input for error messages instead of copying every character it reads. With `get_read_count()` and `count_consumed_lines()`, the lexer also derives the read position from the adapter and counts lines only when an error needs them, instead of counting characters and lines on every read.
|
||||
- `supports_bulk_scan`, `bulk_data()`, `bulk_remaining()`, and `bulk_skip()` let the lexer scan strings directly in contiguous memory, several bytes at a time, and skip the spaces that indent a line in 8-byte steps.
|
||||
@@ -240,6 +250,39 @@ The function `input_adapter` picks the right adapter for the argument passed to
|
||||
- `input_stream_adapter` reads from a `std::istream`.
|
||||
- `file_input_adapter` reads from a `std::FILE*`.
|
||||
|
||||
The adapters have no common base class: the lexer and the parser are templates on the adapter type, and `wide_string_input_adapter` wraps an `iterator_input_adapter`:
|
||||
|
||||
```
|
||||
classDiagram
|
||||
class input_adapter ["input adapter"] {
|
||||
<<concept>>
|
||||
+char_type
|
||||
+get_character() int_type
|
||||
+get_elements(T* dest, size_t count) size_t
|
||||
}
|
||||
class iterator_input_adapter {
|
||||
-IteratorType current
|
||||
-SentinelType end
|
||||
}
|
||||
class wide_string_input_adapter {
|
||||
-BaseInputAdapter base_adapter
|
||||
}
|
||||
class input_stream_adapter {
|
||||
-std::istream* is
|
||||
-std::streambuf* sb
|
||||
}
|
||||
class file_input_adapter {
|
||||
-std::FILE* m_file
|
||||
}
|
||||
input_adapter <|.. iterator_input_adapter
|
||||
input_adapter <|.. wide_string_input_adapter
|
||||
input_adapter <|.. input_stream_adapter
|
||||
input_adapter <|.. file_input_adapter
|
||||
wide_string_input_adapter o-- iterator_input_adapter : converts to UTF-8
|
||||
```
|
||||
|
||||
The input adapters as a class diagram. The dotted arrows mean that each adapter implements the input adapter concept; the diamond shows that `wide_string_input_adapter` holds an `iterator_input_adapter`.
|
||||
|
||||
## SAX interface
|
||||
|
||||
The parser does not build values itself. It reports what it reads as events to a [SAX](https://json.nlohmann.me/features/parsing/sax_interface/index.md) consumer, which implements the interface [`json_sax`](https://json.nlohmann.me/api/json_sax/index.md): `null`, `boolean`, `number_integer`, `number_unsigned`, `number_float`, `string`, `binary`, `start_object`, `key`, `end_object`, `start_array`, `end_array`, and `parse_error`.
|
||||
@@ -249,7 +292,7 @@ The library comes with two consumers in `detail/input/json_sax.hpp`:
|
||||
- `json_sax_dom_parser` builds a [`basic_json`](https://json.nlohmann.me/api/basic_json/index.md) value tree. [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md) uses it.
|
||||
- `json_sax_dom_callback_parser` does the same, but calls a [parser callback](https://json.nlohmann.me/features/parsing/parser_callbacks/index.md) for each event, which can skip values. `parse` uses it when a callback is given.
|
||||
|
||||
The `binary_reader` emits the same events for binary formats, so [`sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md) works with a user-defined consumer for JSON and for all binary formats alike.
|
||||
The `binary_reader` emits the same events for binary formats, so [`sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md) works with a user-defined consumer for JSON and for all binary formats alike. The [SAX event stepper](https://json.nlohmann.me/features/parsing/sax_interface/#sax-event-stepper) shows the events for a small input.
|
||||
|
||||
## Output adapters
|
||||
|
||||
@@ -267,6 +310,35 @@ The `serializer` (used by [`dump`](https://json.nlohmann.me/api/basic_json/dump/
|
||||
- `output_stream_adapter` writes to a `std::ostream`.
|
||||
- `output_string_adapter` appends to a string.
|
||||
|
||||
They implement the abstract class `output_adapter_protocol`. The class `output_adapter` creates the one that matches its argument and holds it in a `std::shared_ptr` (`output_adapter_t`):
|
||||
|
||||
```
|
||||
classDiagram
|
||||
class output_adapter_protocol~CharType~ {
|
||||
<<interface>>
|
||||
+write_character(CharType c)*
|
||||
+write_characters(const CharType* s, size_t length)*
|
||||
}
|
||||
class output_vector_adapter {
|
||||
-std::vector& v
|
||||
}
|
||||
class output_stream_adapter {
|
||||
-std::basic_ostream& stream
|
||||
}
|
||||
class output_string_adapter {
|
||||
-StringType& str
|
||||
}
|
||||
class output_adapter {
|
||||
-output_adapter_t oa
|
||||
}
|
||||
output_adapter_protocol <|-- output_vector_adapter
|
||||
output_adapter_protocol <|-- output_stream_adapter
|
||||
output_adapter_protocol <|-- output_string_adapter
|
||||
output_adapter o-- output_adapter_protocol : shared_ptr
|
||||
```
|
||||
|
||||
The output adapters as a class diagram. The three adapters derive from `output_adapter_protocol` (solid arrows), and `output_adapter` holds one of them through a `shared_ptr` (diamond).
|
||||
|
||||
The `binary_writer` does not call an adapter for every byte. The `to_*` functions that return a `std::vector` write into the vector through a sink (`output_vector_sink`) that is not virtual. The functions that take an output adapter write through a sink (`output_adapter_sink`) that collects the output in a buffer of one kibibyte and passes it to the adapter in blocks, so that the adapter is called (and a stream locked) once per block instead of once per value.
|
||||
|
||||
## Value conversion
|
||||
@@ -297,3 +369,14 @@ Namespace `nlohmann::detail` contains all implementation details. It is not part
|
||||
- type traits to detect the capabilities of user-defined types (`detail/meta/type_traits.hpp`),
|
||||
- backports of C++14/17 features to C++11 (`detail/meta/cpp_future.hpp`), and
|
||||
- helpers such as `string_concat` and `string_escape`.
|
||||
|
||||
## See also
|
||||
|
||||
- [`basic_json`](https://json.nlohmann.me/api/basic_json/index.md) - the main class and all its member functions
|
||||
- [`adl_serializer`](https://json.nlohmann.me/api/adl_serializer/index.md) - customization point for type conversions
|
||||
- [`json_sax`](https://json.nlohmann.me/api/json_sax/index.md) - interface of the SAX parser events
|
||||
- [SAX Interface](https://json.nlohmann.me/features/parsing/sax_interface/index.md) - how to consume parser events without building a DOM
|
||||
- [Zero-copy JSON views](https://json.nlohmann.me/features/json_view/index.md) - the flat node index that backs views and documents
|
||||
- [Template Parameter Requirements](https://json.nlohmann.me/features/types/template_parameters/index.md) - the template parameters of basic_json
|
||||
- [Serialization](https://json.nlohmann.me/features/serialization/index.md) - the output side of the library
|
||||
- [`nlohmann` Namespace](https://json.nlohmann.me/features/namespace/index.md) - how the library namespace is structured
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/customers/" rel="canonical"><link href=../architecture/ rel=prev><link href=../sponsors/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Customers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/customers/" rel="canonical"><link href=../architecture/ rel=prev><link href=../sponsors/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Customers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#customers class=md-skip> Skip to content </a> </div> <div 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12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5vLine truncated
|
||||
+8
-1
@@ -50,5 +50,12 @@ Defining [`JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md) before includin
|
||||
`type_error`/`out_of_range`-style exceptions with a JSON Pointer to the offending value, which can help pinpoint
|
||||
where in a large document a runtime error occurred. This only applies to exceptions thrown *after* a value
|
||||
exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not
|
||||
covered by this mechanism -- see [Parsing and exceptions](../features/parsing/parse_exceptions.md) for how parse
|
||||
covered by this mechanism — see [Parsing and exceptions](../features/parsing/parse_exceptions.md) for how parse
|
||||
errors report their own location instead.
|
||||
|
||||
## See also
|
||||
|
||||
- [`JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md) - extended exception messages with the path of the failing value
|
||||
- [`JSON_DIAGNOSTIC_POSITIONS`](../api/macros/json_diagnostic_positions.md) - record byte positions of values for error messages
|
||||
- [Exceptions](exceptions.md) - all exceptions and their error codes
|
||||
- [`exception`](../api/basic_json/exception.md) - base class of all exceptions thrown by the library
|
||||
@@ -1,3 +1,3 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/debugging/" rel="canonical"><link href=../sponsors/ rel=prev><link href=../../features/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Debugging - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-coLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/debugging/" rel="canonical"><link href=../sponsors/ rel=prev><link href=../../features/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Debugging - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet 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data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Debugging </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-Line truncated
|
||||
</code></pre></div> </li> <li> <p>Generate a Natvis file with the tags of your configuration, for example for <code>JSON_DIAGNOSTICS</code>, <code>JSON_DIAGNOSTIC_POSITIONS</code>, and <code>JSON_NO_SIMD</code>:</p> <div class=highlight><pre><span></span><code>make<span class=w> </span>natvis<span class=w> </span><span class=nv>NATVIS_ARGS</span><span class=o>=</span><span class=s2>"--abi-tags _diag,_dp,_ns --output my_nlohmann_json.natvis"</span>
|
||||
</code></pre></div> </li> <li> <p>Use the generated file instead of <code>nlohmann_json.natvis</code>.</p> </li> </ol> <p><code>--abi-tags</code> can be repeated for several configurations, and <code>--all</code> generates every combination (about 60 MB for 12 <abbr title="Application Binary Interface">ABI</abbr> tags, doubling with each further tag). See <a href="https://github.com/nlohmann/json/tree/develop/tools/generate_natvis"><code>tools/generate_natvis</code></a> for all options.</p> <p>Debug engines that wrap <abbr title="LLVM Debugger">LLDB</abbr> instead of the <abbr title="Microsoft Visual C++">MSVC</abbr> debug engine (for example, <code>codelldb</code> in VS Code) only have partial/experimental Natvis support, and commonly fall back to showing raw internal fields even with the <code>.natvis</code> file present. Switching to <code>cppvsdbg</code> where available, or checking your debug extension's own Natvis support/version, are the next things to try if this happens. There is currently no bundled <abbr title="LLVM Debugger">LLDB</abbr>-native pretty-printer script in this repository.</p> <h2 id=gdb><abbr title="GNU Debugger">GDB</abbr><a class=headerlink href=#gdb title="Permanent link">¶</a></h2> <p>The repository ships a <a href="https://github.com/nlohmann/json/tree/develop/tools/gdb_pretty_printer"><abbr title="GNU Debugger">GDB</abbr> Python pretty printer</a> under <code>tools/gdb_pretty_printer</code>, with its own usage instructions in that directory's <code>README.md</code>.</p> <h2 id=extended-exception-diagnostics>Extended exception diagnostics<a class=headerlink href=#extended-exception-diagnostics title="Permanent link">¶</a></h2> <p>Defining <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> before including the library augments <code>type_error</code>/<code>out_of_range</code>-style exceptions with a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer to the offending value, which can help pinpoint where in a large document a runtime error occurred. This only applies to exceptions thrown <em>after</em> a value exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not covered by this mechanism -- see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> for how parse errors report their own location instead.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 26, 2026 19:13:31 UTC">October 26, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27Line truncated
|
||||
</code></pre></div> </li> <li> <p>Use the generated file instead of <code>nlohmann_json.natvis</code>.</p> </li> </ol> <p><code>--abi-tags</code> can be repeated for several configurations, and <code>--all</code> generates every combination (about 60 MB for 12 <abbr title="Application Binary Interface">ABI</abbr> tags, doubling with each further tag). See <a href="https://github.com/nlohmann/json/tree/develop/tools/generate_natvis"><code>tools/generate_natvis</code></a> for all options.</p> <p>Debug engines that wrap <abbr title="LLVM Debugger">LLDB</abbr> instead of the <abbr title="Microsoft Visual C++">MSVC</abbr> debug engine (for example, <code>codelldb</code> in VS Code) only have partial/experimental Natvis support, and commonly fall back to showing raw internal fields even with the <code>.natvis</code> file present. Switching to <code>cppvsdbg</code> where available, or checking your debug extension's own Natvis support/version, are the next things to try if this happens. There is currently no bundled <abbr title="LLVM Debugger">LLDB</abbr>-native pretty-printer script in this repository.</p> <h2 id=gdb><abbr title="GNU Debugger">GDB</abbr><a class=headerlink href=#gdb title="Permanent link">¶</a></h2> <p>The repository ships a <a href="https://github.com/nlohmann/json/tree/develop/tools/gdb_pretty_printer"><abbr title="GNU Debugger">GDB</abbr> Python pretty printer</a> under <code>tools/gdb_pretty_printer</code>, with its own usage instructions in that directory's <code>README.md</code>.</p> <h2 id=extended-exception-diagnostics>Extended exception diagnostics<a class=headerlink href=#extended-exception-diagnostics title="Permanent link">¶</a></h2> <p>Defining <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> before including the library augments <code>type_error</code>/<code>out_of_range</code>-style exceptions with a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer to the offending value, which can help pinpoint where in a large document a runtime error occurred. This only applies to exceptions thrown <em>after</em> a value exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not covered by this mechanism — see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> for how parse errors report their own location instead.</p> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> - extended exception messages with the path of the failing value</li> <li><a href=../../api/macros/json_diagnostic_positions/ ><code>JSON_DIAGNOSTIC_POSITIONS</code></a> - record byte positions of values for error messages</li> <li><a href=../exceptions/ >Exceptions</a> - all exceptions and their error codes</li> <li><a href=../../api/basic_json/exception/ ><code>exception</code></a> - base class of all exceptions thrown by the library</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 27, 2026 06:41:42 UTC">October 27, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../sponsors/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Sponsors"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction>Line truncated
|
||||
@@ -34,4 +34,11 @@ The repository ships a [GDB Python pretty printer](https://github.com/nlohmann/j
|
||||
|
||||
## Extended exception diagnostics
|
||||
|
||||
Defining [`JSON_DIAGNOSTICS`](https://json.nlohmann.me/api/macros/json_diagnostics/index.md) before including the library augments `type_error`/`out_of_range`-style exceptions with a JSON Pointer to the offending value, which can help pinpoint where in a large document a runtime error occurred. This only applies to exceptions thrown *after* a value exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not covered by this mechanism -- see [Parsing and exceptions](https://json.nlohmann.me/features/parsing/parse_exceptions/index.md) for how parse errors report their own location instead.
|
||||
Defining [`JSON_DIAGNOSTICS`](https://json.nlohmann.me/api/macros/json_diagnostics/index.md) before including the library augments `type_error`/`out_of_range`-style exceptions with a JSON Pointer to the offending value, which can help pinpoint where in a large document a runtime error occurred. This only applies to exceptions thrown *after* a value exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not covered by this mechanism — see [Parsing and exceptions](https://json.nlohmann.me/features/parsing/parse_exceptions/index.md) for how parse errors report their own location instead.
|
||||
|
||||
## See also
|
||||
|
||||
- [`JSON_DIAGNOSTICS`](https://json.nlohmann.me/api/macros/json_diagnostics/index.md) - extended exception messages with the path of the failing value
|
||||
- [`JSON_DIAGNOSTIC_POSITIONS`](https://json.nlohmann.me/api/macros/json_diagnostic_positions/index.md) - record byte positions of values for error messages
|
||||
- [Exceptions](https://json.nlohmann.me/home/exceptions/index.md) - all exceptions and their error codes
|
||||
- [`exception`](https://json.nlohmann.me/api/basic_json/exception/index.md) - base class of all exceptions thrown by the library
|
||||
@@ -15,3 +15,10 @@ Other aspects were not so important to us:
|
||||
- **Speed**. There are certainly [faster JSON libraries](https://github.com/miloyip/nativejson-benchmark#parsing-time) out there. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. If you know how to use a `std::vector` or `std::map`, you are already set.
|
||||
|
||||
See the [contribution guidelines](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#please-dont) for more information.
|
||||
|
||||
## See also
|
||||
|
||||
- [`basic_json`](../api/basic_json/index.md) - the main class and all its member functions
|
||||
- [Macros](../api/macros/index.md) - reference of all macros
|
||||
- [Performance](../features/performance.md) - how the library performs and what is not optimized
|
||||
- [Architecture](architecture.md) - how the library is put together
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/design_goals/" rel="canonical"><link href=../releases/v1.0.0/ rel=prev><link href=../architecture/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Design goals - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#design-goals class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Design goals </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=Line truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/design_goals/" rel="canonical"><link href=../releases/v1.0.0/ rel=prev><link href=../architecture/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Design goals - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet 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data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Design goals </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default 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0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.Line truncated
|
||||
@@ -12,3 +12,10 @@ Other aspects were not so important to us:
|
||||
- **Speed**. There are certainly [faster JSON libraries](https://github.com/miloyip/nativejson-benchmark#parsing-time) out there. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. If you know how to use a `std::vector` or `std::map`, you are already set.
|
||||
|
||||
See the [contribution guidelines](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#please-dont) for more information.
|
||||
|
||||
## See also
|
||||
|
||||
- [`basic_json`](https://json.nlohmann.me/api/basic_json/index.md) - the main class and all its member functions
|
||||
- [Macros](https://json.nlohmann.me/api/macros/index.md) - reference of all macros
|
||||
- [Performance](https://json.nlohmann.me/features/performance/index.md) - how the library performs and what is not optimized
|
||||
- [Architecture](https://json.nlohmann.me/home/architecture/index.md) - how the library is put together
|
||||
+228
-42
@@ -6,35 +6,209 @@
|
||||
|
||||
All exceptions inherit from class `json::exception` (which in turn inherits from `std::exception`). It is used as the base class for all exceptions thrown by the `basic_json` class. This class can hence be used as "wildcard" to catch exceptions.
|
||||
|
||||
``` mermaid
|
||||
classDiagram
|
||||
direction LR
|
||||
class `std::exception` {
|
||||
<<interface>>
|
||||
}
|
||||
The map shows the class tree and every exception id documented on this page; click an id to jump to its section.
|
||||
|
||||
class `json::exception` {
|
||||
+const int id
|
||||
+const char* what() const
|
||||
}
|
||||
<div class="nj-fig-wrap" markdown>
|
||||
<svg class="nj-fig nj-exceptions-map nj-exceptions-map--wide" viewBox="0 0 760 694" aria-labelledby="nj-exc-map-title-w nj-exc-map-desc-w" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
|
||||
<title id="nj-exc-map-title-w">Exception id map</title>
|
||||
<desc id="nj-exc-map-desc-w">Class tree: std::exception is the base of json::exception, which is the base of the five exception families parse_error (ids 1xx), invalid_iterator (2xx), type_error (3xx), out_of_range (4xx) and other_error (5xx). Each family lists the ids documented on this page, 68 in total; every id links to its section.</desc>
|
||||
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||||
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||||
<rect class="nj-exceptions-box" x="12" y="12" width="200" height="52" rx="7"/><text class="nj-exceptions-name" x="24" y="34">std::exception</text><text class="nj-exceptions-sub" x="24" y="53">C++ standard library base</text>
|
||||
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<rect class="nj-exceptions-box" x="12" y="104" width="300" height="52" rx="7"/><text class="nj-exceptions-name" x="24" y="126">json::exception</text><text class="nj-exceptions-sub" x="24" y="145">id, what() · catch-all</text>
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||||
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|
||||
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||||
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||||
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|
||||
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|
||||
<a class="nj-exceptions-fam" xlink:href="#iterator-errors" aria-label="json::invalid_iterator, 2xx · 14 ids"><rect class="nj-exceptions-box nj-exceptions-box--fam" x="64" y="296" width="214" height="52" rx="7"/><text class="nj-exceptions-name" x="76" y="318">json::invalid_iterator</text><text class="nj-exceptions-sub" x="76" y="337">2xx · 14 ids</text></a>
|
||||
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|
||||
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||||
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|
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|
||||
<title id="nj-exc-map-title-n">Exception id map</title>
|
||||
<desc id="nj-exc-map-desc-n">Class tree: std::exception is the base of json::exception, which is the base of the five exception families parse_error (ids 1xx), invalid_iterator (2xx), type_error (3xx), out_of_range (4xx) and other_error (5xx). Each family lists the ids documented on this page, 68 in total; every id links to its section.</desc>
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|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error312" aria-label="json.exception.type_error.312"><rect x="302.5" y="702" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="311.5" y="723.5">312</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error313" aria-label="json.exception.type_error.313"><rect x="64" y="742" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="73" y="763.5">313</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error314" aria-label="json.exception.type_error.314"><rect x="111.7" y="742" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="120.7" y="763.5">314</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error315" aria-label="json.exception.type_error.315"><rect x="159.4" y="742" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="168.4" y="763.5">315</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error316" aria-label="json.exception.type_error.316"><rect x="207.1" y="742" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="216.1" y="763.5">316</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error317" aria-label="json.exception.type_error.317"><rect x="254.8" y="742" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="263.8" y="763.5">317</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error318" aria-label="json.exception.type_error.318"><rect x="302.5" y="742" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="311.5" y="763.5">318</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error319" aria-label="json.exception.type_error.319"><rect x="64" y="782" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="73" y="803.5">319</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error320" aria-label="json.exception.type_error.320"><rect x="111.7" y="782" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="120.7" y="803.5">320</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptiontype_error321" aria-label="json.exception.type_error.321"><rect x="159.4" y="782" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="168.4" y="803.5">321</text></a>
|
||||
<line class="nj-exceptions-edge" x1="34" y1="868" x2="64" y2="868"/>
|
||||
<a class="nj-exceptions-fam" xlink:href="#out-of-range" aria-label="json::out_of_range, 4xx · 16 ids"><rect class="nj-exceptions-box nj-exceptions-box--fam" x="64" y="842" width="284" height="52" rx="7"/><text class="nj-exceptions-name" x="76" y="864">json::out_of_range</text><text class="nj-exceptions-sub" x="76" y="883">4xx · 16 ids</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range401" aria-label="json.exception.out_of_range.401"><rect x="64" y="904" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="73" y="925.5">401</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range402" aria-label="json.exception.out_of_range.402"><rect x="111.7" y="904" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="120.7" y="925.5">402</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range403" aria-label="json.exception.out_of_range.403"><rect x="159.4" y="904" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="168.4" y="925.5">403</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range404" aria-label="json.exception.out_of_range.404"><rect x="207.1" y="904" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="216.1" y="925.5">404</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range405" aria-label="json.exception.out_of_range.405"><rect x="254.8" y="904" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="263.8" y="925.5">405</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range406" aria-label="json.exception.out_of_range.406"><rect x="302.5" y="904" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="311.5" y="925.5">406</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range407" aria-label="json.exception.out_of_range.407"><rect x="64" y="944" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="73" y="965.5">407</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range408" aria-label="json.exception.out_of_range.408"><rect x="111.7" y="944" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="120.7" y="965.5">408</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range409" aria-label="json.exception.out_of_range.409"><rect x="159.4" y="944" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="168.4" y="965.5">409</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range410" aria-label="json.exception.out_of_range.410"><rect x="207.1" y="944" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="216.1" y="965.5">410</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range411" aria-label="json.exception.out_of_range.411"><rect x="254.8" y="944" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="263.8" y="965.5">411</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range412" aria-label="json.exception.out_of_range.412"><rect x="302.5" y="944" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="311.5" y="965.5">412</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range413" aria-label="json.exception.out_of_range.413"><rect x="64" y="984" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="73" y="1005.5">413</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range414" aria-label="json.exception.out_of_range.414"><rect x="111.7" y="984" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="120.7" y="1005.5">414</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range415" aria-label="json.exception.out_of_range.415"><rect x="159.4" y="984" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="168.4" y="1005.5">415</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionout_of_range416" aria-label="json.exception.out_of_range.416"><rect x="207.1" y="984" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="216.1" y="1005.5">416</text></a>
|
||||
<line class="nj-exceptions-edge" x1="34" y1="1070" x2="64" y2="1070"/>
|
||||
<a class="nj-exceptions-fam" xlink:href="#further-exceptions" aria-label="json::other_error, 5xx · 2 ids"><rect class="nj-exceptions-box nj-exceptions-box--fam" x="64" y="1044" width="284" height="52" rx="7"/><text class="nj-exceptions-name" x="76" y="1066">json::other_error</text><text class="nj-exceptions-sub" x="76" y="1085">5xx · 2 ids</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionother_error501" aria-label="json.exception.other_error.501"><rect x="64" y="1106" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="73" y="1127.5">501</text></a>
|
||||
<a class="nj-exceptions-chip" xlink:href="#jsonexceptionother_error502" aria-label="json.exception.other_error.502"><rect x="111.7" y="1106" width="41.7" height="34" rx="6"/><text class="nj-exceptions-id" x="120.7" y="1127.5">502</text></a>
|
||||
</svg>
|
||||
|
||||
class `json::parse_error` {
|
||||
+const std::size_t byte
|
||||
}
|
||||
</div>
|
||||
|
||||
class `json::invalid_iterator`
|
||||
class `json::type_error`
|
||||
class `json::out_of_range`
|
||||
class `json::other_error`
|
||||
<p class="nj-caption" markdown>The exception classes from `std::exception` down to the five families, each with the ids it can throw. Every id chip links to the section that describes it.</p>
|
||||
|
||||
`std::exception` <|-- `json::exception`
|
||||
`json::exception` <|-- `json::parse_error`
|
||||
`json::exception` <|-- `json::invalid_iterator`
|
||||
`json::exception` <|-- `json::type_error`
|
||||
`json::exception` <|-- `json::out_of_range`
|
||||
`json::exception` <|-- `json::other_error`
|
||||
Which exception an element access throws depends on the function and on the type of the value:
|
||||
|
||||
```mermaid
|
||||
flowchart LR
|
||||
S{{"which call?"}} -->|"at(key)"| A{{"j is"}}
|
||||
A -->|"object, key missing"| A1["out_of_range.403"]
|
||||
A -->|"array or null"| A2["type_error.304"]
|
||||
S -->|"at(index)"| B{{"j is"}}
|
||||
B -->|"array, index >= size()"| B1["out_of_range.401"]
|
||||
B -->|"object or null"| B2["type_error.304"]
|
||||
S -->|"non-const operator[](key)"| C{{"j is"}}
|
||||
C -->|"object or null"| C1["no exception: a missing key is inserted as null"]
|
||||
C -->|"array"| C2["type_error.305"]
|
||||
S -->|"value(key, default)"| D{{"j is"}}
|
||||
D -->|"object, key missing"| D1["no exception: returns the default"]
|
||||
D -->|"object, incompatible value type"| D2["type_error.302"]
|
||||
D -->|"array or null"| D3["type_error.306"]
|
||||
```
|
||||
|
||||
<p class="nj-caption" markdown>Exceptions thrown by element access. Start at the call on the left, follow the edge that matches the type of `j`, and read the exception id (or "no exception") in the box at the end.</p>
|
||||
|
||||
### Switch off exceptions
|
||||
|
||||
Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol [`JSON_NOEXCEPTION`](../api/macros/json_noexception.md). In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER` (overriding `#!cpp throw`), `JSON_TRY_USER` (overriding `#!cpp try`), and `JSON_CATCH_USER` (overriding `#!cpp catch`).
|
||||
@@ -297,7 +471,7 @@ JSON uses the `\uxxxx` format to describe Unicode characters. Code points above
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
parse error at 14: missing or wrong low surrogate
|
||||
[json.exception.parse_error.102] parse error at 14: missing or wrong low surrogate
|
||||
```
|
||||
|
||||
!!! note
|
||||
@@ -311,7 +485,7 @@ Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are inva
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
parse error: code points above 0x10FFFF are invalid
|
||||
[json.exception.parse_error.103] parse error: code points above 0x10FFFF are invalid
|
||||
```
|
||||
|
||||
!!! note
|
||||
@@ -1081,7 +1255,7 @@ The provided array index `i` is larger than `size-1`.
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
array index 3 is out of range
|
||||
[json.exception.out_of_range.401] array index 3 is out of range
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.402
|
||||
@@ -1091,7 +1265,7 @@ The special array index `-` in a JSON Pointer never describes a valid element of
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
array index '-' (3) is out of range
|
||||
[json.exception.out_of_range.402] array index '-' (3) is out of range
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.403
|
||||
@@ -1101,7 +1275,7 @@ The provided key was not found in the JSON object.
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
key 'foo' not found
|
||||
[json.exception.out_of_range.403] key 'foo' not found
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.404
|
||||
@@ -1112,7 +1286,7 @@ contains other characters (e.g., `1a`), or `-` where it cannot be used.
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
unresolved reference token 'foo'
|
||||
[json.exception.out_of_range.404] unresolved reference token 'foo'
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.405
|
||||
@@ -1124,7 +1298,7 @@ also thrown when the parent or a reference token of an empty JSON Pointer is req
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
JSON pointer has no parent
|
||||
[json.exception.out_of_range.405] JSON pointer has no parent
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.406
|
||||
@@ -1136,7 +1310,7 @@ double-precision number when `number_float_t` is `#!cpp float`.
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
number overflow parsing '10E1000'
|
||||
[json.exception.out_of_range.406] number overflow parsing '10E1000'
|
||||
```
|
||||
```
|
||||
[json.exception.out_of_range.406] syntax error while parsing CBOR value: number overflow
|
||||
@@ -1172,10 +1346,10 @@ exception, because they serialize integers beyond 64 bits as high-precision numb
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
[json.exception.out_of_range.407] integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
```
|
||||
```
|
||||
integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
[json.exception.out_of_range.407] integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.408
|
||||
@@ -1193,7 +1367,7 @@ count and one marker per element are kept), so any value it produces can still b
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
excessive array size: 8658170730974374167
|
||||
[json.exception.out_of_range.408] excessive array size: 8658170730974374167
|
||||
```
|
||||
```
|
||||
[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive array size
|
||||
@@ -1212,7 +1386,7 @@ Key identifiers to be serialized to BSON cannot contain code point U+0000, since
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
BSON key cannot contain code point U+0000 (at byte 2)
|
||||
[json.exception.out_of_range.409] BSON key cannot contain code point U+0000 (at byte 2)
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.410
|
||||
@@ -1224,8 +1398,8 @@ a JSON pointer exceeds the range of `size_type` (e.g., on 32-bit platforms).
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
enum value out of range
|
||||
array index 18446744073709551615 exceeds size_type
|
||||
[json.exception.out_of_range.410] enum value out of range
|
||||
[json.exception.out_of_range.410] array index 18446744073709551615 exceeds size_type
|
||||
```
|
||||
|
||||
The second message is thrown, for instance, by `#!cpp json::parse("[1, 2]").at("/18446744073709551615"_json_pointer)`
|
||||
@@ -1240,7 +1414,7 @@ A JSON Patch `add` operation cannot be applied because the target location's par
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
[json.exception.out_of_range.411] cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
```
|
||||
|
||||
!!! note
|
||||
@@ -1258,10 +1432,10 @@ is thrown when a value is too large to be described by such a length field.
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
BSON length 2147483661 exceeds maximum of 2147483647
|
||||
[json.exception.out_of_range.412] BSON length 2147483661 exceeds maximum of 2147483647
|
||||
```
|
||||
```
|
||||
MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
[json.exception.out_of_range.412] MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
```
|
||||
|
||||
!!! note
|
||||
@@ -1278,7 +1452,7 @@ A JSON Patch `remove` operation cannot be applied because the target location's
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
[json.exception.out_of_range.413] cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
```
|
||||
|
||||
!!! note
|
||||
@@ -1292,7 +1466,7 @@ A JSON Patch `move` operation's `"from"` location is a proper prefix of its `"pa
|
||||
!!! failure "Example message"
|
||||
|
||||
```
|
||||
cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
[json.exception.out_of_range.414] cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
```
|
||||
|
||||
!!! note
|
||||
@@ -1428,3 +1602,15 @@ do not throw.
|
||||
|
||||
This exception was added in version 3.13.0. Before that, debug builds aborted on an assertion and release builds
|
||||
wrote a `$` marker without `#`, which [`from_ubjson`](../api/basic_json/from_ubjson.md) then rejected.
|
||||
|
||||
## See also
|
||||
|
||||
- [`exception`](../api/basic_json/exception.md) - base class of all exceptions thrown by the library
|
||||
- [`parse_error`](../api/basic_json/parse_error.md) - exceptions indicating a parse error
|
||||
- [`invalid_iterator`](../api/basic_json/invalid_iterator.md) - exceptions indicating errors with iterators
|
||||
- [`type_error`](../api/basic_json/type_error.md) - exceptions indicating a wrong type
|
||||
- [`out_of_range`](../api/basic_json/out_of_range.md) - exceptions indicating access out of range
|
||||
- [`other_error`](../api/basic_json/other_error.md) - exceptions indicating other library errors
|
||||
- [`JSON_NOEXCEPTION`](../api/macros/json_noexception.md) - switch off exceptions
|
||||
- [`JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md) - extended exception messages with the path of the failing value
|
||||
- [Working Without Exceptions](../features/no_exceptions.md) - use the library without exceptions
|
||||
+34
-46
@@ -1,29 +1,17 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/exceptions/" rel="canonical"><link href=../faq/ rel=prev><link href=../releases/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Exceptions - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#exceptions class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Exceptions </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-componLine truncated
|
||||
direction LR
|
||||
class `std::exception` {
|
||||
<<interface>>
|
||||
}
|
||||
|
||||
class `json::exception` {
|
||||
+const int id
|
||||
+const char* what() const
|
||||
}
|
||||
|
||||
class `json::parse_error` {
|
||||
+const std::size_t byte
|
||||
}
|
||||
|
||||
class `json::invalid_iterator`
|
||||
class `json::type_error`
|
||||
class `json::out_of_range`
|
||||
class `json::other_error`
|
||||
|
||||
`std::exception` <|-- `json::exception`
|
||||
`json::exception` <|-- `json::parse_error`
|
||||
`json::exception` <|-- `json::invalid_iterator`
|
||||
`json::exception` <|-- `json::type_error`
|
||||
`json::exception` <|-- `json::out_of_range`
|
||||
`json::exception` <|-- `json::other_error`</code></pre> <h3 id=switch-off-exceptions>Switch off exceptions<a class=headerlink href=#switch-off-exceptions title="Permanent link">¶</a></h3> <p>Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag <code>-fno-exceptions</code> or by defining the symbol <a href=../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a>. In this case, exceptions are replaced by <code>abort()</code> calls. You can further control this behavior by defining <code>JSON_THROW_USER</code> (overriding <code class=highlight><span class=k>throw</span></code>), <code>JSON_TRY_USER</code> (overriding <code class=highlight><span class=k>try</span></code>), and <code>JSON_CATCH_USER</code> (overriding <code class=highlight><span class=k>catch</span></code>).</p> <p>See <a href=../../features/no_exceptions/ >Working without exceptions</a> for the functions that report errors without throwing.</p> <p>Note that <a href=../../api/macros/json_throw_user/ ><code>JSON_THROW_USER</code></a> should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.</p> <details class=example> <summary>Example: switch off exceptions and log errors before aborting</summary> <p>The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/exceptions/" rel="canonical"><link href=../faq/ rel=prev><link href=../releases/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Exceptions - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#exceptions class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Exceptions </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79lLine truncated
|
||||
S{{"which call?"}} -->|"at(key)"| A{{"j is"}}
|
||||
A -->|"object, key missing"| A1["out_of_range.403"]
|
||||
A -->|"array or null"| A2["type_error.304"]
|
||||
S -->|"at(index)"| B{{"j is"}}
|
||||
B -->|"array, index >= size()"| B1["out_of_range.401"]
|
||||
B -->|"object or null"| B2["type_error.304"]
|
||||
S -->|"non-const operator[](key)"| C{{"j is"}}
|
||||
C -->|"object or null"| C1["no exception: a missing key is inserted as null"]
|
||||
C -->|"array"| C2["type_error.305"]
|
||||
S -->|"value(key, default)"| D{{"j is"}}
|
||||
D -->|"object, key missing"| D1["no exception: returns the default"]
|
||||
D -->|"object, incompatible value type"| D2["type_error.302"]
|
||||
D -->|"array or null"| D3["type_error.306"]</code></pre> <p class=nj-caption>Exceptions thrown by element access. Start at the call on the left, follow the edge that matches the type of <code>j</code>, and read the exception id (or "no exception") in the box at the end.</p> <h3 id=switch-off-exceptions>Switch off exceptions<a class=headerlink href=#switch-off-exceptions title="Permanent link">¶</a></h3> <p>Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag <code>-fno-exceptions</code> or by defining the symbol <a href=../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a>. In this case, exceptions are replaced by <code>abort()</code> calls. You can further control this behavior by defining <code>JSON_THROW_USER</code> (overriding <code class=highlight><span class=k>throw</span></code>), <code>JSON_TRY_USER</code> (overriding <code class=highlight><span class=k>try</span></code>), and <code>JSON_CATCH_USER</code> (overriding <code class=highlight><span class=k>catch</span></code>).</p> <p>See <a href=../../features/no_exceptions/ >Working without exceptions</a> for the functions that report errors without throwing.</p> <p>Note that <a href=../../api/macros/json_throw_user/ ><code>JSON_THROW_USER</code></a> should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.</p> <details class=example> <summary>Example: switch off exceptions and log errors before aborting</summary> <p>The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
|
||||
<span class=cp>#define JSON_TRY_USER if(true)</span>
|
||||
<span class=cp>#define JSON_CATCH_USER(exception) if(false)</span>
|
||||
@@ -116,8 +104,8 @@ byte position of error: 8
|
||||
<span class=w> </span><span class=k>return</span><span class=w> </span><span class=mi>1</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
<span class=n>json</span><span class=w> </span><span class=n>data</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>f</span><span class=p>);</span>
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionparse_error102>json.exception.parse_error.102<a class=headerlink href=#jsonexceptionparse_error102 title="Permanent link">¶</a></h3> <p><abbr title="JavaScript Object Notation">JSON</abbr> uses the <code>\uxxxx</code> format to describe Unicode characters. Code points above 0xFFFF are split into two <code>\uxxxx</code> entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>parse error at 14: missing or wrong low surrogate
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception is not used any more. Instead <a href=#jsonexceptionparse_error101>json.exception.parse_error.101</a> with a more detailed description is used.</p> </div> <h3 id=jsonexceptionparse_error103>json.exception.parse_error.103<a class=headerlink href=#jsonexceptionparse_error103 title="Permanent link">¶</a></h3> <p>Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are invalid.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>parse error: code points above 0x10FFFF are invalid
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionparse_error102>json.exception.parse_error.102<a class=headerlink href=#jsonexceptionparse_error102 title="Permanent link">¶</a></h3> <p><abbr title="JavaScript Object Notation">JSON</abbr> uses the <code>\uxxxx</code> format to describe Unicode characters. Code points above 0xFFFF are split into two <code>\uxxxx</code> entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.102] parse error at 14: missing or wrong low surrogate
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception is not used any more. Instead <a href=#jsonexceptionparse_error101>json.exception.parse_error.101</a> with a more detailed description is used.</p> </div> <h3 id=jsonexceptionparse_error103>json.exception.parse_error.103<a class=headerlink href=#jsonexceptionparse_error103 title="Permanent link">¶</a></h3> <p>Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are invalid.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.103] parse error: code points above 0x10FFFF are invalid
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception is not used any more. Instead <a href=#jsonexceptionparse_error101>json.exception.parse_error.101</a> with a more detailed description is used.</p> </div> <h3 id=jsonexceptionparse_error104>json.exception.parse_error.104<a class=headerlink href=#jsonexceptionparse_error104 title="Permanent link">¶</a></h3> <p><a href="https://tools.ietf.org/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a> requires a <abbr title="JavaScript Object Notation">JSON</abbr> Patch document to be a <abbr title="JavaScript Object Notation">JSON</abbr> document that represents an array of objects.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.104] parse error: JSON patch must be an array of objects
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error105>json.exception.parse_error.105<a class=headerlink href=#jsonexceptionparse_error105 title="Permanent link">¶</a></h3> <p>An operation of a <abbr title="JavaScript Object Notation">JSON</abbr> Patch document must contain exactly one "op" member, whose value indicates the operation to perform. Its value must be one of "add", "remove", "replace", "move", "copy", or "test"; other values are errors.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation 'add' must have member 'value'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation 'copy' must have string member 'from'
|
||||
@@ -258,27 +246,27 @@ exception id: 308
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code>message: [json.exception.out_of_range.401] array index 4 is out of range
|
||||
exception id: 401
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionout_of_range401>json.exception.out_of_range.401<a class=headerlink href=#jsonexceptionout_of_range401 title="Permanent link">¶</a></h3> <p>The provided array index <code>i</code> is larger than <code>size-1</code>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>array index 3 is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range402>json.exception.out_of_range.402<a class=headerlink href=#jsonexceptionout_of_range402 title="Permanent link">¶</a></h3> <p>The special array index <code>-</code> in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>array index '-' (3) is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range403>json.exception.out_of_range.403<a class=headerlink href=#jsonexceptionout_of_range403 title="Permanent link">¶</a></h3> <p>The provided key was not found in the <abbr title="JavaScript Object Notation">JSON</abbr> object.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>key 'foo' not found
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range404>json.exception.out_of_range.404<a class=headerlink href=#jsonexceptionout_of_range404 title="Permanent link">¶</a></h3> <p>A reference token in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer could not be resolved, for instance an array index that begins with a digit but contains other characters (e.g., <code>1a</code>), or <code>-</code> where it cannot be used.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>unresolved reference token 'foo'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range405>json.exception.out_of_range.405<a class=headerlink href=#jsonexceptionout_of_range405 title="Permanent link">¶</a></h3> <p>The <abbr title="JavaScript Object Notation">JSON</abbr> Patch operations 'remove' and 'move' cannot be applied to the root element of the <abbr title="JavaScript Object Notation">JSON</abbr> value. The exception is also thrown when the parent or a reference token of an empty <abbr title="JavaScript Object Notation">JSON</abbr> Pointer is requested, for instance by <a href=../../api/json_pointer/back/ ><code>back</code></a> or <a href=../../api/json_pointer/pop_back/ ><code>pop_back</code></a>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>JSON pointer has no parent
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range406>json.exception.out_of_range.406<a class=headerlink href=#jsonexceptionout_of_range406 title="Permanent link">¶</a></h3> <p>A parsed number could not be stored without changing it to <abbr title="Not a Number">NaN</abbr> or INF. For the binary formats, this happens when a finite floating-point number does not fit into <a href=../../api/basic_json/number_float_t/ ><code>number_float_t</code></a>, for example a double-precision number when <code>number_float_t</code> is <code class=highlight><span class=kt>float</span></code>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>number overflow parsing '10E1000'
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionout_of_range401>json.exception.out_of_range.401<a class=headerlink href=#jsonexceptionout_of_range401 title="Permanent link">¶</a></h3> <p>The provided array index <code>i</code> is larger than <code>size-1</code>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.401] array index 3 is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range402>json.exception.out_of_range.402<a class=headerlink href=#jsonexceptionout_of_range402 title="Permanent link">¶</a></h3> <p>The special array index <code>-</code> in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.402] array index '-' (3) is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range403>json.exception.out_of_range.403<a class=headerlink href=#jsonexceptionout_of_range403 title="Permanent link">¶</a></h3> <p>The provided key was not found in the <abbr title="JavaScript Object Notation">JSON</abbr> object.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.403] key 'foo' not found
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range404>json.exception.out_of_range.404<a class=headerlink href=#jsonexceptionout_of_range404 title="Permanent link">¶</a></h3> <p>A reference token in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer could not be resolved, for instance an array index that begins with a digit but contains other characters (e.g., <code>1a</code>), or <code>-</code> where it cannot be used.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.404] unresolved reference token 'foo'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range405>json.exception.out_of_range.405<a class=headerlink href=#jsonexceptionout_of_range405 title="Permanent link">¶</a></h3> <p>The <abbr title="JavaScript Object Notation">JSON</abbr> Patch operations 'remove' and 'move' cannot be applied to the root element of the <abbr title="JavaScript Object Notation">JSON</abbr> value. The exception is also thrown when the parent or a reference token of an empty <abbr title="JavaScript Object Notation">JSON</abbr> Pointer is requested, for instance by <a href=../../api/json_pointer/back/ ><code>back</code></a> or <a href=../../api/json_pointer/pop_back/ ><code>pop_back</code></a>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.405] JSON pointer has no parent
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range406>json.exception.out_of_range.406<a class=headerlink href=#jsonexceptionout_of_range406 title="Permanent link">¶</a></h3> <p>A parsed number could not be stored without changing it to <abbr title="Not a Number">NaN</abbr> or INF. For the binary formats, this happens when a finite floating-point number does not fit into <a href=../../api/basic_json/number_float_t/ ><code>number_float_t</code></a>, for example a double-precision number when <code>number_float_t</code> is <code class=highlight><span class=kt>float</span></code>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.406] number overflow parsing '10E1000'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.406] syntax error while parsing CBOR value: number overflow
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range407>json.exception.out_of_range.407<a class=headerlink href=#jsonexceptionout_of_range407 title="Permanent link">¶</a></h3> <p>An integer number cannot be represented by the binary format it is serialized to:</p> <ul> <li><a href=../../features/binary_formats/bon8/ ><abbr title="Binary Object Notation 8">BON8</abbr></a> only stores integers that fit into int64, so <a href=../../api/basic_json/to_bon8/ ><code>to_bon8</code></a> throws for unsigned integers greater than 9223372036854775807 and, with a number type wider than 64 bits, for any integer outside the int64 range.</li> <li><a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>, <a href=../../features/binary_formats/messagepack/ >MessagePack</a>, and <a href=../../features/binary_formats/bson/ ><abbr title="Binary JSON">BSON</abbr></a> store integers in at most 64 bits. With the default number types, every integer fits, but a <a href=../../api/basic_json/number_integer_t/ ><code>number_integer_t</code></a> or <a href=../../api/basic_json/number_unsigned_t/ ><code>number_unsigned_t</code></a> wider than 64 bits (e.g., <code>__int128</code>) can hold values outside the range of the format: [-2^64, 2^64-1] for <abbr title="Concise Binary Object Representation">CBOR</abbr>, [-2^63, 2^64-1] for MessagePack, and the range of int64 (signed integers) or uint64 (unsigned integers) for <abbr title="Binary JSON">BSON</abbr>.</li> </ul> <p><a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> and <a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a> never throw this exception, because they serialize integers beyond 64 bits as high-precision numbers.</p> <div class="admonition note"> <p class=admonition-title>Former occurrences</p> <p>The <abbr title="Universal Binary JSON">UBJSON</abbr> and <abbr title="Binary JSON">BSON</abbr> writers used to throw this exception as well:</p> <ul> <li>Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision <abbr title="Universal Binary JSON">UBJSON</abbr> numbers.</li> <li>Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 <abbr title="Binary JSON">BSON</abbr> numbers.</li> </ul> <p>Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, and <abbr title="Binary JSON">BSON</abbr> silently truncated integers wider than 64 bits, and <abbr title="Binary JData">BJData</abbr> truncated unsigned integers wider than 64 bits that were elements of ND-arrays with <code>"_ArrayType_": "uint64"</code>.</p> </div> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range408>json.exception.out_of_range.408<a class=headerlink href=#jsonexceptionout_of_range408 title="Permanent link">¶</a></h3> <p>The size of an array or object in a <a href=../../features/binary_formats/ >binary format</a> exceeds the maximal capacity: the size following <code>#</code> for <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a>/<a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a>, or the encoded length for <a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>.</p> <p>The exception is also thrown for a <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> array of a type that is encoded by its marker alone (<code>Z</code>, <code>T</code> or <code>F</code>) whose declared count exceeds 1,048,576 (<code>1 << 20</code>). Such an array has no payload, so its count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values. <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> writes longer arrays of these types without the <code>$</code> type annotation (the <code>#</code> count and one marker per element are kept), so any value it produces can still be read back.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>excessive array size: 8658170730974374167
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range407>json.exception.out_of_range.407<a class=headerlink href=#jsonexceptionout_of_range407 title="Permanent link">¶</a></h3> <p>An integer number cannot be represented by the binary format it is serialized to:</p> <ul> <li><a href=../../features/binary_formats/bon8/ ><abbr title="Binary Object Notation 8">BON8</abbr></a> only stores integers that fit into int64, so <a href=../../api/basic_json/to_bon8/ ><code>to_bon8</code></a> throws for unsigned integers greater than 9223372036854775807 and, with a number type wider than 64 bits, for any integer outside the int64 range.</li> <li><a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>, <a href=../../features/binary_formats/messagepack/ >MessagePack</a>, and <a href=../../features/binary_formats/bson/ ><abbr title="Binary JSON">BSON</abbr></a> store integers in at most 64 bits. With the default number types, every integer fits, but a <a href=../../api/basic_json/number_integer_t/ ><code>number_integer_t</code></a> or <a href=../../api/basic_json/number_unsigned_t/ ><code>number_unsigned_t</code></a> wider than 64 bits (e.g., <code>__int128</code>) can hold values outside the range of the format: [-2^64, 2^64-1] for <abbr title="Concise Binary Object Representation">CBOR</abbr>, [-2^63, 2^64-1] for MessagePack, and the range of int64 (signed integers) or uint64 (unsigned integers) for <abbr title="Binary JSON">BSON</abbr>.</li> </ul> <p><a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> and <a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a> never throw this exception, because they serialize integers beyond 64 bits as high-precision numbers.</p> <div class="admonition note"> <p class=admonition-title>Former occurrences</p> <p>The <abbr title="Universal Binary JSON">UBJSON</abbr> and <abbr title="Binary JSON">BSON</abbr> writers used to throw this exception as well:</p> <ul> <li>Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision <abbr title="Universal Binary JSON">UBJSON</abbr> numbers.</li> <li>Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 <abbr title="Binary JSON">BSON</abbr> numbers.</li> </ul> <p>Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, and <abbr title="Binary JSON">BSON</abbr> silently truncated integers wider than 64 bits, and <abbr title="Binary JData">BJData</abbr> truncated unsigned integers wider than 64 bits that were elements of ND-arrays with <code>"_ArrayType_": "uint64"</code>.</p> </div> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.407] integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.407] integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range408>json.exception.out_of_range.408<a class=headerlink href=#jsonexceptionout_of_range408 title="Permanent link">¶</a></h3> <p>The size of an array or object in a <a href=../../features/binary_formats/ >binary format</a> exceeds the maximal capacity: the size following <code>#</code> for <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a>/<a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a>, or the encoded length for <a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>.</p> <p>The exception is also thrown for a <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> array of a type that is encoded by its marker alone (<code>Z</code>, <code>T</code> or <code>F</code>) whose declared count exceeds 1,048,576 (<code>1 << 20</code>). Such an array has no payload, so its count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values. <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> writes longer arrays of these types without the <code>$</code> type annotation (the <code>#</code> count and one marker per element are kept), so any value it produces can still be read back.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] excessive array size: 8658170730974374167
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive array size
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive map size
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] syntax error while parsing UBJSON size: excessive array size
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range409>json.exception.out_of_range.409<a class=headerlink href=#jsonexceptionout_of_range409 title="Permanent link">¶</a></h3> <p>Key identifiers to be serialized to <abbr title="Binary JSON">BSON</abbr> cannot contain code point U+0000, since the key is stored as zero-terminated c-string.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>BSON key cannot contain code point U+0000 (at byte 2)
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range410>json.exception.out_of_range.410<a class=headerlink href=#jsonexceptionout_of_range410 title="Permanent link">¶</a></h3> <p>This exception is thrown when an undefined value is used with <a href=../../api/macros/nlohmann_json_serialize_enum_strict/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM_STRICT</code></a>, or when an array index in a <abbr title="JavaScript Object Notation">JSON</abbr> pointer exceeds the range of <code>size_type</code> (e.g., on 32-bit platforms).</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>enum value out of range
|
||||
array index 18446744073709551615 exceeds size_type
|
||||
</code></pre></div> <p>The second message is thrown, for instance, by <code class=highlight><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=s>"[1, 2]"</span><span class=p>).</span><span class=n>at</span><span class=p>(</span><span class=s>"/18446744073709551615"</span><span class=n>_json_pointer</span><span class=p>)</span></code> on a 64-bit platform, where <code>size_type</code> is <code class=highlight><span class=n>std</span><span class=o>::</span><span class=kt>size_t</span></code> and this index is <code>SIZE_MAX</code>. An index that does not fit into 64 bits (such as <code>18446744073709551616</code>) is not reported as 410 but as <a href=#jsonexceptionout_of_range404><code>out_of_range.404</code></a>.</p> </div> <h3 id=jsonexceptionout_of_range411>json.exception.out_of_range.411<a class=headerlink href=#jsonexceptionout_of_range411 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>add</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, an <code>add</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) cannot receive a new member or element.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.</p> <p>A <code>null</code> parent is rejected as well. Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, an <code>add</code> into a <code>null</code> parent silently converted it to an object (e.g., <code>add</code> at <code>/foo/bar</code> turned <code>{"foo":null}</code> into <code>{"foo":{"bar":1}}</code>).</p> </div> <h3 id=jsonexceptionout_of_range412>json.exception.out_of_range.412<a class=headerlink href=#jsonexceptionout_of_range412 title="Permanent link">¶</a></h3> <p><abbr title="Binary JSON">BSON</abbr> stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer, and MessagePack stores the length of strings, binary values, arrays, and objects in at most an unsigned 32-bit integer. This exception is thrown when a value is too large to be described by such a length field.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>BSON length 2147483661 exceeds maximum of 2147483647
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, the <abbr title="Binary JSON">BSON</abbr> length was silently truncated, and <a href=../../api/basic_json/to_bson/ ><code>to_bson</code></a> produced documents with negative length prefixes that <a href=../../api/basic_json/from_bson/ ><code>from_bson</code></a> rejected; <a href=../../api/basic_json/to_msgpack/ ><code>to_msgpack</code></a> wrote such a value without any length, producing output that could not be read back.</p> </div> <h3 id=jsonexceptionout_of_range413>json.exception.out_of_range.413<a class=headerlink href=#jsonexceptionout_of_range413 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>remove</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, a <code>remove</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) or <code>null</code> has no members or elements to remove.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation was silently ignored (the <code>remove</code> operation had no effect).</p> </div> <h3 id=jsonexceptionout_of_range414>json.exception.out_of_range.414<a class=headerlink href=#jsonexceptionout_of_range414 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>move</code> operation's <code>"from"</code> location is a proper prefix of its <code>"path"</code> location. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a> (section 4.4), a location cannot be moved into one of its own children.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range409>json.exception.out_of_range.409<a class=headerlink href=#jsonexceptionout_of_range409 title="Permanent link">¶</a></h3> <p>Key identifiers to be serialized to <abbr title="Binary JSON">BSON</abbr> cannot contain code point U+0000, since the key is stored as zero-terminated c-string.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.409] BSON key cannot contain code point U+0000 (at byte 2)
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range410>json.exception.out_of_range.410<a class=headerlink href=#jsonexceptionout_of_range410 title="Permanent link">¶</a></h3> <p>This exception is thrown when an undefined value is used with <a href=../../api/macros/nlohmann_json_serialize_enum_strict/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM_STRICT</code></a>, or when an array index in a <abbr title="JavaScript Object Notation">JSON</abbr> pointer exceeds the range of <code>size_type</code> (e.g., on 32-bit platforms).</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.410] enum value out of range
|
||||
[json.exception.out_of_range.410] array index 18446744073709551615 exceeds size_type
|
||||
</code></pre></div> <p>The second message is thrown, for instance, by <code class=highlight><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=s>"[1, 2]"</span><span class=p>).</span><span class=n>at</span><span class=p>(</span><span class=s>"/18446744073709551615"</span><span class=n>_json_pointer</span><span class=p>)</span></code> on a 64-bit platform, where <code>size_type</code> is <code class=highlight><span class=n>std</span><span class=o>::</span><span class=kt>size_t</span></code> and this index is <code>SIZE_MAX</code>. An index that does not fit into 64 bits (such as <code>18446744073709551616</code>) is not reported as 410 but as <a href=#jsonexceptionout_of_range404><code>out_of_range.404</code></a>.</p> </div> <h3 id=jsonexceptionout_of_range411>json.exception.out_of_range.411<a class=headerlink href=#jsonexceptionout_of_range411 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>add</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, an <code>add</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) cannot receive a new member or element.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.411] cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.</p> <p>A <code>null</code> parent is rejected as well. Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, an <code>add</code> into a <code>null</code> parent silently converted it to an object (e.g., <code>add</code> at <code>/foo/bar</code> turned <code>{"foo":null}</code> into <code>{"foo":{"bar":1}}</code>).</p> </div> <h3 id=jsonexceptionout_of_range412>json.exception.out_of_range.412<a class=headerlink href=#jsonexceptionout_of_range412 title="Permanent link">¶</a></h3> <p><abbr title="Binary JSON">BSON</abbr> stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer, and MessagePack stores the length of strings, binary values, arrays, and objects in at most an unsigned 32-bit integer. This exception is thrown when a value is too large to be described by such a length field.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.412] BSON length 2147483661 exceeds maximum of 2147483647
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.412] MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, the <abbr title="Binary JSON">BSON</abbr> length was silently truncated, and <a href=../../api/basic_json/to_bson/ ><code>to_bson</code></a> produced documents with negative length prefixes that <a href=../../api/basic_json/from_bson/ ><code>from_bson</code></a> rejected; <a href=../../api/basic_json/to_msgpack/ ><code>to_msgpack</code></a> wrote such a value without any length, producing output that could not be read back.</p> </div> <h3 id=jsonexceptionout_of_range413>json.exception.out_of_range.413<a class=headerlink href=#jsonexceptionout_of_range413 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>remove</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, a <code>remove</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) or <code>null</code> has no members or elements to remove.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.413] cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation was silently ignored (the <code>remove</code> operation had no effect).</p> </div> <h3 id=jsonexceptionout_of_range414>json.exception.out_of_range.414<a class=headerlink href=#jsonexceptionout_of_range414 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>move</code> operation's <code>"from"</code> location is a proper prefix of its <code>"path"</code> location. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a> (section 4.4), a location cannot be moved into one of its own children.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.414] cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation could succeed with a corrupted result: for an array target, removing the "from" element before the "add" step shifted subsequent indices, so "path" silently re-resolved to a different element than intended.</p> </div> <h3 id=jsonexceptionout_of_range415>json.exception.out_of_range.415<a class=headerlink href=#jsonexceptionout_of_range415 title="Permanent link">¶</a></h3> <p>MessagePack's ext type and <abbr title="Binary JSON">BSON</abbr>'s binary subtype are each stored in a single byte. This exception is thrown when serializing a <a href=../../api/byte_container_with_subtype/ ><code>byte_container_with_subtype</code></a> whose subtype exceeds 255, the largest value the library can store in that byte.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.415] subtype 70000 is too large for the MessagePack ext type (max 255)
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.415] subtype 70000 is too large for the BSON binary subtype (max 255)
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, subtypes above 255 were silently truncated modulo 256 instead of raising an error.</p> </div> <h3 id=jsonexceptionout_of_range416>json.exception.out_of_range.416<a class=headerlink href=#jsonexceptionout_of_range416 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/parse/ ><code>basic_json_document::parse()</code></a> and the other parsing functions of <a href=../../api/basic_json_document/ ><code>basic_json_document</code></a> index a value's position in the source text in 32 bits, so they do not support an input of 4294967280 bytes (4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> minus 16 bytes) or more. The same 32-bit limit applies to an <strong>editable</strong> document's own storage: <a href=../../api/basic_json_document/set/ ><code>set</code></a> and <a href=../../api/basic_json_document/push_back/ ><code>push_back</code></a> throw this exception once the strings and number tokens written by edits reach 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> in total, or once more than 4294967295 arrays/objects have had an element set or appended to them. The same limit applies to an <a href=../../features/json_view/#images>image</a>: <a href=../../api/basic_json_document/save/ ><code>save()</code></a> throws it if the node count, the text, or the decoded strings it would write would individually reach 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.416] input of 4294967280 bytes or more is not supported by json_document
|
||||
@@ -318,4 +306,4 @@ array index 18446744073709551615 exceeds size_type
|
||||
exception id: 501
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionother_error501>json.exception.other_error.501<a class=headerlink href=#jsonexceptionother_error501 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch operation 'test' failed. The unsuccessful operation is also printed.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Executing <code class=highlight><span class=p>{</span><span class=nt>"op"</span><span class=p>:</span><span class=s2>"test"</span><span class=p>,</span><span class=w> </span><span class=nt>"path"</span><span class=p>:</span><span class=s2>"/baz"</span><span class=p>,</span><span class=w> </span><span class=nt>"value"</span><span class=p>:</span><span class=s2>"bar"</span><span class=p>}</span></code> on <code class=highlight><span class=p>{</span><span class=nt>"baz"</span><span class=p>:</span><span class=w> </span><span class=s2>"qux"</span><span class=p>}</span></code>:</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.501] unsuccessful: {"op":"test","path":"/baz","value":"bar"}
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionother_error502>json.exception.other_error.502<a class=headerlink href=#jsonexceptionother_error502 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> and <a href=../../api/basic_json/to_bjdata/ ><code>to_bjdata</code></a> were called with <code>use_type = true</code> but <code>use_size = false</code>, and the value contains a non-empty array or object (or, with <abbr title="Binary JData">BJData</abbr> Draft 3, any binary value). <abbr title="Universal Binary JSON">UBJSON</abbr> requires a size marker (<code>#</code>) after a type marker (<code>$</code>); scalars and empty arrays or objects do not throw.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.502] use_type requires use_size = true
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, debug builds aborted on an assertion and release builds wrote a <code>$</code> marker without <code>#</code>, which <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a> then rejected.</p> </div> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 26, 2026 19:13:30 UTC">October 26, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.Line truncated
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, debug builds aborted on an assertion and release builds wrote a <code>$</code> marker without <code>#</code>, which <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a> then rejected.</p> </div> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../api/basic_json/exception/ ><code>exception</code></a> - base class of all exceptions thrown by the library</li> <li><a href=../../api/basic_json/parse_error/ ><code>parse_error</code></a> - exceptions indicating a parse error</li> <li><a href=../../api/basic_json/invalid_iterator/ ><code>invalid_iterator</code></a> - exceptions indicating errors with iterators</li> <li><a href=../../api/basic_json/type_error/ ><code>type_error</code></a> - exceptions indicating a wrong type</li> <li><a href=../../api/basic_json/out_of_range/ ><code>out_of_range</code></a> - exceptions indicating access out of range</li> <li><a href=../../api/basic_json/other_error/ ><code>other_error</code></a> - exceptions indicating other library errors</li> <li><a href=../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a> - switch off exceptions</li> <li><a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> - extended exception messages with the path of the failing value</li> <li><a href=../../features/no_exceptions/ >Working Without Exceptions</a> - use the library without exceptions</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 27, 2026 06:41:42 UTC">October 27, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../faq/ class="md-footer__link md-footer__link--prev" aria-label="Previous: FAQ"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> FAQ </div> </div> </a> <a href=../releases/ class="md-footer__link md-footer__link--next" aria-label="Next: Overview"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Overview </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 Line truncated
|
||||
+53
-45
@@ -6,35 +6,31 @@
|
||||
|
||||
All exceptions inherit from class `json::exception` (which in turn inherits from `std::exception`). It is used as the base class for all exceptions thrown by the `basic_json` class. This class can hence be used as "wildcard" to catch exceptions.
|
||||
|
||||
The map shows the class tree and every exception id documented on this page; click an id to jump to its section.
|
||||
|
||||
The exception classes from `std::exception` down to the five families, each with the ids it can throw. Every id chip links to the section that describes it.
|
||||
|
||||
Which exception an element access throws depends on the function and on the type of the value:
|
||||
|
||||
```
|
||||
classDiagram
|
||||
direction LR
|
||||
class `std::exception` {
|
||||
<<interface>>
|
||||
}
|
||||
|
||||
class `json::exception` {
|
||||
+const int id
|
||||
+const char* what() const
|
||||
}
|
||||
|
||||
class `json::parse_error` {
|
||||
+const std::size_t byte
|
||||
}
|
||||
|
||||
class `json::invalid_iterator`
|
||||
class `json::type_error`
|
||||
class `json::out_of_range`
|
||||
class `json::other_error`
|
||||
|
||||
`std::exception` <|-- `json::exception`
|
||||
`json::exception` <|-- `json::parse_error`
|
||||
`json::exception` <|-- `json::invalid_iterator`
|
||||
`json::exception` <|-- `json::type_error`
|
||||
`json::exception` <|-- `json::out_of_range`
|
||||
`json::exception` <|-- `json::other_error`
|
||||
flowchart LR
|
||||
S{{"which call?"}} -->|"at(key)"| A{{"j is"}}
|
||||
A -->|"object, key missing"| A1["out_of_range.403"]
|
||||
A -->|"array or null"| A2["type_error.304"]
|
||||
S -->|"at(index)"| B{{"j is"}}
|
||||
B -->|"array, index >= size()"| B1["out_of_range.401"]
|
||||
B -->|"object or null"| B2["type_error.304"]
|
||||
S -->|"non-const operator[](key)"| C{{"j is"}}
|
||||
C -->|"object or null"| C1["no exception: a missing key is inserted as null"]
|
||||
C -->|"array"| C2["type_error.305"]
|
||||
S -->|"value(key, default)"| D{{"j is"}}
|
||||
D -->|"object, key missing"| D1["no exception: returns the default"]
|
||||
D -->|"object, incompatible value type"| D2["type_error.302"]
|
||||
D -->|"array or null"| D3["type_error.306"]
|
||||
```
|
||||
|
||||
Exceptions thrown by element access. Start at the call on the left, follow the edge that matches the type of `j`, and read the exception id (or "no exception") in the box at the end.
|
||||
|
||||
### Switch off exceptions
|
||||
|
||||
Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol [`JSON_NOEXCEPTION`](https://json.nlohmann.me/api/macros/json_noexception/index.md). In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER` (overriding `throw`), `JSON_TRY_USER` (overriding `try`), and `JSON_CATCH_USER` (overriding `catch`).
|
||||
@@ -276,7 +272,7 @@ JSON uses the `\uxxxx` format to describe Unicode characters. Code points above
|
||||
Example message
|
||||
|
||||
```
|
||||
parse error at 14: missing or wrong low surrogate
|
||||
[json.exception.parse_error.102] parse error at 14: missing or wrong low surrogate
|
||||
```
|
||||
|
||||
Note
|
||||
@@ -290,7 +286,7 @@ Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are inva
|
||||
Example message
|
||||
|
||||
```
|
||||
parse error: code points above 0x10FFFF are invalid
|
||||
[json.exception.parse_error.103] parse error: code points above 0x10FFFF are invalid
|
||||
```
|
||||
|
||||
Note
|
||||
@@ -1045,7 +1041,7 @@ The provided array index `i` is larger than `size-1`.
|
||||
Example message
|
||||
|
||||
```
|
||||
array index 3 is out of range
|
||||
[json.exception.out_of_range.401] array index 3 is out of range
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.402
|
||||
@@ -1055,7 +1051,7 @@ The special array index `-` in a JSON Pointer never describes a valid element of
|
||||
Example message
|
||||
|
||||
```
|
||||
array index '-' (3) is out of range
|
||||
[json.exception.out_of_range.402] array index '-' (3) is out of range
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.403
|
||||
@@ -1065,7 +1061,7 @@ The provided key was not found in the JSON object.
|
||||
Example message
|
||||
|
||||
```
|
||||
key 'foo' not found
|
||||
[json.exception.out_of_range.403] key 'foo' not found
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.404
|
||||
@@ -1075,7 +1071,7 @@ A reference token in a JSON Pointer could not be resolved, for instance an array
|
||||
Example message
|
||||
|
||||
```
|
||||
unresolved reference token 'foo'
|
||||
[json.exception.out_of_range.404] unresolved reference token 'foo'
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.405
|
||||
@@ -1085,7 +1081,7 @@ The JSON Patch operations 'remove' and 'move' cannot be applied to the root elem
|
||||
Example message
|
||||
|
||||
```
|
||||
JSON pointer has no parent
|
||||
[json.exception.out_of_range.405] JSON pointer has no parent
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.406
|
||||
@@ -1095,7 +1091,7 @@ A parsed number could not be stored without changing it to NaN or INF. For the b
|
||||
Example messages
|
||||
|
||||
```
|
||||
number overflow parsing '10E1000'
|
||||
[json.exception.out_of_range.406] number overflow parsing '10E1000'
|
||||
```
|
||||
|
||||
```
|
||||
@@ -1123,11 +1119,11 @@ Before version 3.13.0 unreleased, CBOR, MessagePack, and BSON silently truncated
|
||||
Example messages
|
||||
|
||||
```
|
||||
integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
[json.exception.out_of_range.407] integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
```
|
||||
|
||||
```
|
||||
integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
[json.exception.out_of_range.407] integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.408
|
||||
@@ -1139,7 +1135,7 @@ The exception is also thrown for a [UBJSON](https://json.nlohmann.me/features/bi
|
||||
Example messages
|
||||
|
||||
```
|
||||
excessive array size: 8658170730974374167
|
||||
[json.exception.out_of_range.408] excessive array size: 8658170730974374167
|
||||
```
|
||||
|
||||
```
|
||||
@@ -1161,7 +1157,7 @@ Key identifiers to be serialized to BSON cannot contain code point U+0000, since
|
||||
Example message
|
||||
|
||||
```
|
||||
BSON key cannot contain code point U+0000 (at byte 2)
|
||||
[json.exception.out_of_range.409] BSON key cannot contain code point U+0000 (at byte 2)
|
||||
```
|
||||
|
||||
### json.exception.out_of_range.410
|
||||
@@ -1171,8 +1167,8 @@ This exception is thrown when an undefined value is used with [`NLOHMANN_JSON_SE
|
||||
Example message
|
||||
|
||||
```
|
||||
enum value out of range
|
||||
array index 18446744073709551615 exceeds size_type
|
||||
[json.exception.out_of_range.410] enum value out of range
|
||||
[json.exception.out_of_range.410] array index 18446744073709551615 exceeds size_type
|
||||
```
|
||||
|
||||
The second message is thrown, for instance, by `json::parse("[1, 2]").at("/18446744073709551615"_json_pointer)` on a 64-bit platform, where `size_type` is `std::size_t` and this index is `SIZE_MAX`. An index that does not fit into 64 bits (such as `18446744073709551616`) is not reported as 410 but as [`out_of_range.404`](#jsonexceptionout_of_range404).
|
||||
@@ -1184,7 +1180,7 @@ A JSON Patch `add` operation cannot be applied because the target location's par
|
||||
Example message
|
||||
|
||||
```
|
||||
cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
[json.exception.out_of_range.411] cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
```
|
||||
|
||||
Note
|
||||
@@ -1200,11 +1196,11 @@ BSON stores the length of documents, arrays, strings, and binary values in a sig
|
||||
Example messages
|
||||
|
||||
```
|
||||
BSON length 2147483661 exceeds maximum of 2147483647
|
||||
[json.exception.out_of_range.412] BSON length 2147483661 exceeds maximum of 2147483647
|
||||
```
|
||||
|
||||
```
|
||||
MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
[json.exception.out_of_range.412] MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
```
|
||||
|
||||
Note
|
||||
@@ -1218,7 +1214,7 @@ A JSON Patch `remove` operation cannot be applied because the target location's
|
||||
Example message
|
||||
|
||||
```
|
||||
cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
[json.exception.out_of_range.413] cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
```
|
||||
|
||||
Note
|
||||
@@ -1232,7 +1228,7 @@ A JSON Patch `move` operation's `"from"` location is a proper prefix of its `"pa
|
||||
Example message
|
||||
|
||||
```
|
||||
cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
[json.exception.out_of_range.414] cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
```
|
||||
|
||||
Note
|
||||
@@ -1354,3 +1350,15 @@ Example message
|
||||
Note
|
||||
|
||||
This exception was added in version 3.13.0 unreleased. Before that, debug builds aborted on an assertion and release builds wrote a `$` marker without `#`, which [`from_ubjson`](https://json.nlohmann.me/api/basic_json/from_ubjson/index.md) then rejected.
|
||||
|
||||
## See also
|
||||
|
||||
- [`exception`](https://json.nlohmann.me/api/basic_json/exception/index.md) - base class of all exceptions thrown by the library
|
||||
- [`parse_error`](https://json.nlohmann.me/api/basic_json/parse_error/index.md) - exceptions indicating a parse error
|
||||
- [`invalid_iterator`](https://json.nlohmann.me/api/basic_json/invalid_iterator/index.md) - exceptions indicating errors with iterators
|
||||
- [`type_error`](https://json.nlohmann.me/api/basic_json/type_error/index.md) - exceptions indicating a wrong type
|
||||
- [`out_of_range`](https://json.nlohmann.me/api/basic_json/out_of_range/index.md) - exceptions indicating access out of range
|
||||
- [`other_error`](https://json.nlohmann.me/api/basic_json/other_error/index.md) - exceptions indicating other library errors
|
||||
- [`JSON_NOEXCEPTION`](https://json.nlohmann.me/api/macros/json_noexception/index.md) - switch off exceptions
|
||||
- [`JSON_DIAGNOSTICS`](https://json.nlohmann.me/api/macros/json_diagnostics/index.md) - extended exception messages with the path of the failing value
|
||||
- [Working Without Exceptions](https://json.nlohmann.me/features/no_exceptions/index.md) - use the library without exceptions
|
||||
+12
-3
@@ -20,7 +20,7 @@
|
||||
|
||||
yield different results (`#!json [true]` vs. `#!json true`)?
|
||||
|
||||
This is a known issue, and -- even worse -- the behavior differs between GCC and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like
|
||||
This is a known issue, and — even worse — the behavior differs between GCC and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like
|
||||
|
||||
```cpp
|
||||
json array = {1, 2, 3, 4};
|
||||
@@ -192,6 +192,8 @@ The value is a `json`, and printing it produces JSON text. Convert it first: `#!
|
||||
|
||||
Use `contains` or `find`. Do not test with the non-const `operator[]`: like `std::map::operator[]`, it inserts a `null`
|
||||
value for a missing key. See [Does this key exist?](../features/element_access/index.md#does-this-key-exist).
|
||||
For choosing between `value`, `contains`/`find`, `at`, `operator[]`, and JSON Pointer, see the decision flow in
|
||||
[Element access](../features/element_access/index.md).
|
||||
|
||||
### Reading a value with a fallback
|
||||
|
||||
@@ -392,8 +394,8 @@ As described [above](#parse-errors-reading-non-ascii-characters), the library st
|
||||
|
||||
No. `basic_json` provides no built-in synchronization, the same as `std::map` or `std::vector`. Concurrent reads of
|
||||
the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent `json`
|
||||
objects. However, any concurrent write to a `json` object -- or a concurrent read while another thread writes to the
|
||||
same object -- is a data race and requires external synchronization (e.g., a `std::mutex`) by the caller.
|
||||
objects. However, any concurrent write to a `json` object — or a concurrent read while another thread writes to the
|
||||
same object — is a data race and requires external synchronization (e.g., a `std::mutex`) by the caller.
|
||||
|
||||
### Schema validation
|
||||
|
||||
@@ -596,3 +598,10 @@ well. See [#3669](https://github.com/nlohmann/json/issues/3669) for details.
|
||||
This is not an issue with the code, but rather with the compiler itself. On Android, use a current NDK (see above).
|
||||
For MinGW, please refer to [this site](http://tehsausage.com/mingw-to-string) and
|
||||
[this discussion](https://github.com/nlohmann/json/issues/136) for information on how to fix this bug.
|
||||
|
||||
## See also
|
||||
|
||||
- [`basic_json`](../api/basic_json/index.md) - the main class and all its member functions
|
||||
- [Macros](../api/macros/index.md) - reference of all macros
|
||||
- [Exceptions](exceptions.md) - all exceptions and their error codes
|
||||
- [Features](../features/index.md) - overview of all features
|
||||
+5
-5
@@ -1,6 +1,6 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/faq/" rel="canonical"><link href=../license/ rel=prev><link href=../exceptions/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>FAQ - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-cLine truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/faq/" rel="canonical"><link href=../license/ rel=prev><link href=../exceptions/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>FAQ - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link 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<header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> FAQ </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom 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6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 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</code></pre></div> <p>and</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=nf>j</span><span class=p>(</span><span class=nb>true</span><span class=p>);</span>
|
||||
</code></pre></div> <p>yield different results (<code class=highlight><span class=p>[</span><span class=kc>true</span><span class=p>]</span></code> vs. <code class=highlight><span class=kc>true</span></code>)?</p> </div> <p>This is a known issue, and -- even worse -- the behavior differs between <abbr title="GNU Compiler Collection">GCC</abbr> and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>,</span><span class=w> </span><span class=mi>3</span><span class=p>,</span><span class=w> </span><span class=mi>4</span><span class=p>};</span>
|
||||
</code></pre></div> <p>yield different results (<code class=highlight><span class=p>[</span><span class=kc>true</span><span class=p>]</span></code> vs. <code class=highlight><span class=kc>true</span></code>)?</p> </div> <p>This is a known issue, and — even worse — the behavior differs between <abbr title="GNU Compiler Collection">GCC</abbr> and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>,</span><span class=w> </span><span class=mi>3</span><span class=p>,</span><span class=w> </span><span class=mi>4</span><span class=p>};</span>
|
||||
</code></pre></div> <p>for arrays and</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>}};</span><span class=w> </span>
|
||||
</code></pre></div> <p>for objects.</p> <div class="admonition tip"> <p class=admonition-title>Tip</p> <p>To avoid any confusion and ensure portable code, <strong>do not</strong> use brace initialization with the types <code>basic_json</code>, <code>json</code>, or <code>ordered_json</code> unless you want to create an object or array as shown in the examples above.</p> <p>To explicitly create a single-element array, use <code>json::array({value})</code>:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>array</span><span class=p>({</span><span class=nb>true</span><span class=p>});</span><span class=w> </span><span class=c1>// [true]</span>
|
||||
</code></pre></div> </div> <p><strong>Opt-in copy semantics (since version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>)</strong></p> <p>If you define <a href=../../api/macros/json_brace_init_copy_semantics/ ><code>JSON_BRACE_INIT_COPY_SEMANTICS</code></a> to <code>1</code> before including the library, single-element brace initialization is treated as copy/move instead of creating a single-element array:</p> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_BRACE_INIT_COPY_SEMANTICS 1</span>
|
||||
@@ -8,7 +8,7 @@
|
||||
|
||||
<span class=n>json</span><span class=w> </span><span class=n>obj</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{{</span><span class=s>"key"</span><span class=p>,</span><span class=w> </span><span class=s>"value"</span><span class=p>}};</span>
|
||||
<span class=n>json</span><span class=w> </span><span class=n>j</span><span class=p>{</span><span class=n>obj</span><span class=p>};</span><span class=w> </span><span class=c1>// -> {"key":"value"} (copy, not array)</span>
|
||||
</code></pre></div> <p>Without the macro (default behavior), <code>json j{obj}</code> creates <code>[{"key":"value"}]</code>. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.</p> <h2 id=getting-started>Getting started<a class=headerlink href=#getting-started title="Permanent link">¶</a></h2> <h3 id=which-file-do-i-need>Which file do I need?<a class=headerlink href=#which-file-do-i-need title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Do I have to clone the repository or build the library?</p> </div> <p>No. The library is header-only: the single file <a href="https://github.com/nlohmann/json/releases"><code>json.hpp</code></a> from the releases page is all you need, including the <code>_json</code> literals. Put it in a directory <code>nlohmann</code> on your include path. Companion headers (<code>json_fwd.hpp</code>, <code>json_view.hpp</code>, <code>json_literals.hpp</code>) are only needed if you use them. See <a href=../../integration/#header-only>Integration</a>.</p> <h3 id=using-cmake-or-a-package-manager>Using CMake or a package manager<a class=headerlink href=#using-cmake-or-a-package-manager title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>How do I add the library with CMake, Conan, vcpkg, Homebrew, or another tool?</p> </div> <p>See <a href=../../integration/cmake/ >CMake</a> for <code>find_package</code>, <code>add_subdirectory</code>, and <code>FetchContent</code>, and <a href=../../integration/package_managers/ >Package managers</a> for the list of supported package managers.</p> <h3 id=the-ide-cannot-open-the-header>The <abbr title="Integrated Development Environment">IDE</abbr> cannot open the header<a class=headerlink href=#the-ide-cannot-open-the-header title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>The compiler finds <code>nlohmann/json.hpp</code>, but my <abbr title="Integrated Development Environment">IDE</abbr> reports "cannot open source file". Why?</p> </div> <p>The compiler's include path is set correctly, but the <abbr title="Integrated Development Environment">IDE</abbr>'s is not. Add the same directory to the include paths of the <abbr title="Integrated Development Environment">IDE</abbr> (or of its language server); the build itself is not affected.</p> <h3 id=compile-times>Compile times<a class=headerlink href=#compile-times title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Including the library slows down my build. What can I do?</p> </div> <p>Include <a href=../../integration/compile_times/#include-json_fwdhpp-in-headers><code>json_fwd.hpp</code></a> in headers and <code>json.hpp</code> only in the source files that need it, instantiate <code>basic_json</code> once, and consider precompiled headers or <a href=../../features/modules/ >C++20 modules</a>. See <a href=../../integration/compile_times/ >Compile times</a>.</p> <h2 id=parsing>Parsing<a class=headerlink href=#parsing title="Permanent link">¶</a></h2> <h3 id=parsing-a-file-fails-with-unexpected-end-of-input>Parsing a file fails with "unexpected end of input"<a class=headerlink href=#parsing-a-file-fails-with-unexpected-end-of-input title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p><code>json::parse(file)</code> throws <code>parse_error.101</code> at line 1, column 1 for a file that is valid <abbr title="JavaScript Object Notation">JSON</abbr>. Why?</p> </div> <p>The parser did not see any character: the file was most likely not opened. A relative path is resolved against the working directory of the running program, which is often the build directory of your <abbr title="Integrated Development Environment">IDE</abbr>, not the source directory. Check <code>is_open()</code> and try an absolute path. Other causes are an empty file and a stream that was already read. See <a href=../exceptions/#jsonexceptionparse_error101><code>parse_error.101</code></a>.</p> <h3 id=input-that-arrives-in-chunks>Input that arrives in chunks<a class=headerlink href=#input-that-arrives-in-chunks title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>My data comes from a socket in pieces. How do I parse it?</p> </div> <p>The parser cannot be resumed. Frame the messages (one value per line, a length prefix) and parse each complete frame, or buffer the chunks until the value is complete; a <code>parse_error</code> at the end of the buffer means the input ended prematurely. See <a href=../../features/parsing/large_and_partial_input/#input-arriving-in-chunks>Large, streamed, and partial input</a>.</p> <h3 id=several-values-in-one-stream>Several values in one stream<a class=headerlink href=#several-values-in-oneLine truncated
|
||||
</code></pre></div> <p>Without the macro (default behavior), <code>json j{obj}</code> creates <code>[{"key":"value"}]</code>. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.</p> <h2 id=getting-started>Getting started<a class=headerlink href=#getting-started title="Permanent link">¶</a></h2> <h3 id=which-file-do-i-need>Which file do I need?<a class=headerlink href=#which-file-do-i-need title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Do I have to clone the repository or build the library?</p> </div> <p>No. The library is header-only: the single file <a href="https://github.com/nlohmann/json/releases"><code>json.hpp</code></a> from the releases page is all you need, including the <code>_json</code> literals. Put it in a directory <code>nlohmann</code> on your include path. Companion headers (<code>json_fwd.hpp</code>, <code>json_view.hpp</code>, <code>json_literals.hpp</code>) are only needed if you use them. See <a href=../../integration/#header-only>Integration</a>.</p> <h3 id=using-cmake-or-a-package-manager>Using CMake or a package manager<a class=headerlink href=#using-cmake-or-a-package-manager title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>How do I add the library with CMake, Conan, vcpkg, Homebrew, or another tool?</p> </div> <p>See <a href=../../integration/cmake/ >CMake</a> for <code>find_package</code>, <code>add_subdirectory</code>, and <code>FetchContent</code>, and <a href=../../integration/package_managers/ >Package managers</a> for the list of supported package managers.</p> <h3 id=the-ide-cannot-open-the-header>The <abbr title="Integrated Development Environment">IDE</abbr> cannot open the header<a class=headerlink href=#the-ide-cannot-open-the-header title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>The compiler finds <code>nlohmann/json.hpp</code>, but my <abbr title="Integrated Development Environment">IDE</abbr> reports "cannot open source file". Why?</p> </div> <p>The compiler's include path is set correctly, but the <abbr title="Integrated Development Environment">IDE</abbr>'s is not. Add the same directory to the include paths of the <abbr title="Integrated Development Environment">IDE</abbr> (or of its language server); the build itself is not affected.</p> <h3 id=compile-times>Compile times<a class=headerlink href=#compile-times title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Including the library slows down my build. What can I do?</p> </div> <p>Include <a href=../../integration/compile_times/#include-json_fwdhpp-in-headers><code>json_fwd.hpp</code></a> in headers and <code>json.hpp</code> only in the source files that need it, instantiate <code>basic_json</code> once, and consider precompiled headers or <a href=../../features/modules/ >C++20 modules</a>. See <a href=../../integration/compile_times/ >Compile times</a>.</p> <h2 id=parsing>Parsing<a class=headerlink href=#parsing title="Permanent link">¶</a></h2> <h3 id=parsing-a-file-fails-with-unexpected-end-of-input>Parsing a file fails with "unexpected end of input"<a class=headerlink href=#parsing-a-file-fails-with-unexpected-end-of-input title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p><code>json::parse(file)</code> throws <code>parse_error.101</code> at line 1, column 1 for a file that is valid <abbr title="JavaScript Object Notation">JSON</abbr>. Why?</p> </div> <p>The parser did not see any character: the file was most likely not opened. A relative path is resolved against the working directory of the running program, which is often the build directory of your <abbr title="Integrated Development Environment">IDE</abbr>, not the source directory. Check <code>is_open()</code> and try an absolute path. Other causes are an empty file and a stream that was already read. See <a href=../exceptions/#jsonexceptionparse_error101><code>parse_error.101</code></a>.</p> <h3 id=input-that-arrives-in-chunks>Input that arrives in chunks<a class=headerlink href=#input-that-arrives-in-chunks title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>My data comes from a socket in pieces. How do I parse it?</p> </div> <p>The parser cannot be resumed. Frame the messages (one value per line, a length prefix) and parse each complete frame, or buffer the chunks until the value is complete; a <code>parse_error</code> at the end of the buffer means the input ended prematurely. See <a href=../../features/parsing/large_and_partial_input/#input-arriving-in-chunks>Large, streamed, and partial input</a>.</p> <h3 id=several-values-in-one-stream>Several values in one stream<a class=headerlink href=#several-values-in-oneLine truncated
|
||||
<span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=p>(</span><span class=s>"123"</span><span class=p>)</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=sc>'\0'</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=s>"true"</span><span class=p>);</span><span class=w> </span><span class=c1>// == 123, the "true" is silently ignored too</span>
|
||||
</code></pre></div> <p>This is different from any other unexpected trailing byte, which <em>does</em> raise <a href=../exceptions/#jsonexceptionparse_error101><code>parse_error.101</code></a>:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=s>"123x"</span><span class=p>);</span><span class=w> </span><span class=c1>// throws parse_error.101: unexpected additional data</span>
|
||||
</code></pre></div> <p>This falls out of the same convention used when no explicit input length is given at all: <code>json::parse(const char*)</code> already stops at the first <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> byte via <code>strlen()</code>, since a bare pointer has no length of its own. The library applies that same <abbr title="Null character (U+0000, byte value 0)">NUL</abbr>-terminated-C-string convention uniformly, rather than only when a length is genuinely unavailable — so a <code>std::string</code>, iterator range, or container whose content happens to include a <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> byte is affected the same way a raw <code>const char*</code> would be.</p> <p>If your input may contain a trailing or embedded <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> that is <strong>not</strong> meant to signal the end of the <abbr title="JavaScript Object Notation">JSON</abbr> text — for instance, a fixed-size, zero-padded buffer — trim it yourself before calling <code>parse()</code>, since the library will otherwise silently stop there instead of raising an error:</p> <div class=highlight><pre><span></span><code><span class=n>s</span><span class=p>.</span><span class=n>resize</span><span class=p>(</span><span class=n>s</span><span class=p>.</span><span class=n>find</span><span class=p>(</span><span class=sc>'\0'</span><span class=p>));</span><span class=w> </span><span class=c1>// drop everything from the first NUL onward, if any</span>
|
||||
@@ -39,7 +39,7 @@
|
||||
<span class=w> </span><span class=nt>"encoded"</span><span class=p>:</span><span class=w> </span><span class=s2>"車B1234 こんにちは"</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"original"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>36554</span><span class=p>,</span><span class=w> </span><span class=mi>66</span><span class=p>,</span><span class=w> </span><span class=mi>49</span><span class=p>,</span><span class=w> </span><span class=mi>50</span><span class=p>,</span><span class=w> </span><span class=mi>51</span><span class=p>,</span><span class=w> </span><span class=mi>52</span><span class=p>,</span><span class=w> </span><span class=mi>32</span><span class=p>,</span><span class=w> </span><span class=mi>12371</span><span class=p>,</span><span class=w> </span><span class=mi>12435</span><span class=p>,</span><span class=w> </span><span class=mi>12395</span><span class=p>,</span><span class=w> </span><span class=mi>12385</span><span class=p>,</span><span class=w> </span><span class=mi>12399</span><span class=p>]</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> </div> <h2 id=usage>Usage<a class=headerlink href=#usage title="Permanent link">¶</a></h2> <h3 id=thread-safety>Thread safety<a class=headerlink href=#thread-safety title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is <code>basic_json</code> thread-safe?</p> </div> <p>No. <code>basic_json</code> provides no built-in synchronization, the same as <code>std::map</code> or <code>std::vector</code>. Concurrent reads of the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent <code>json</code> objects. However, any concurrent write to a <code>json</code> object -- or a concurrent read while another thread writes to the same object -- is a data race and requires external synchronization (e.g., a <code>std::mutex</code>) by the caller.</p> <h3 id=schema-validation>Schema validation<a class=headerlink href=#schema-validation title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does this library support <abbr title="JavaScript Object Notation">JSON</abbr> Schema validation?</p> </div> <p>Not directly, but the companion project <a href="https://github.com/pboettch/json-schema-validator">json-schema-validator</a> builds <abbr title="JavaScript Object Notation">JSON</abbr> Schema (draft 7; draft 4 in its older, now-superseded 1.x releases) validation on top of this library and is a common recommendation for this use case.</p> <h3 id=memory-use>Memory use<a class=headerlink href=#memory-use title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does the library leak memory? My process stays large after I free a <code>json</code> value.</p> </div> <p>Destroying a value frees everything it owns. Freed memory is returned to the allocator, which does not necessarily give it back to the operating system, so a high resident size alone is not a leak. Copies are deep, and <code>clear()</code> keeps the capacity of an array. See <a href=../../features/performance/#memory>Memory</a>, and use Valgrind or the sanitizers to tell a leak from retained memory.</p> <h3 id=reproducible-builds>Reproducible builds<a class=headerlink href=#reproducible-builds title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>The header path ends up in my binary. How do I get path-independent builds?</p> </div> <p>The runtime assertions embed <code>__FILE__</code>. Define <code>NDEBUG</code> (the default for release builds) or map the path prefix; see <a href=../../integration/#notes-for-builds-and-distribution>Notes for builds and distribution</a>.</p> <h3 id=slow-debug-builds>Slow debug builds<a class=headerlink href=#slow-debug-builds title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Parsing a large file is very slow in my debug build. Can I compile the library with optimizations?</p> </div> <p>The library is header-only, so there is no separate source file. Keep the code that uses <code>json</code> in its own source file and compile that file with optimizations; see <a href=../../integration/#notes-for-builds-and-distribution>Notes for builds and distribution</a>.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <h3 id=parsing-without-exceptions>Parsing without exceptions<a class=headerlink href=#parsing-without-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is it possible to indicate a parse error without throwing an exception?</p> </div> <p>Yes, see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> and <a href=../../features/no_exceptions/ >Working without exceptions</a>.</p> <h3 id=key-name-in-exceptions>Key name in exceptions<a class=headerlink href=#key-name-in-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Can I get the key of the object item that caused an exception?</p> </div> <p>Yes, you can. Please define the symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to get <a href=../exceptions/#extended-diagnostic-messages>extended diagnostics messages</a>.</p> <h2 id=serialization-issues>Serialization issues<a class=headerlink href=#serialization-issues title="Permanent link">¶</a></h2> <h3 id=number-precision>Number precision<a class=headerlink href=#number-precision title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>It seems that precision is lost when serializing a double.</li> <li>Can I change the precision for floating-point serialization?</li> </ul> </div> <p>The library serializes floating-point numbers with theLine truncated
|
||||
</code></pre></div> </div> <h2 id=usage>Usage<a class=headerlink href=#usage title="Permanent link">¶</a></h2> <h3 id=thread-safety>Thread safety<a class=headerlink href=#thread-safety title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is <code>basic_json</code> thread-safe?</p> </div> <p>No. <code>basic_json</code> provides no built-in synchronization, the same as <code>std::map</code> or <code>std::vector</code>. Concurrent reads of the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent <code>json</code> objects. However, any concurrent write to a <code>json</code> object — or a concurrent read while another thread writes to the same object — is a data race and requires external synchronization (e.g., a <code>std::mutex</code>) by the caller.</p> <h3 id=schema-validation>Schema validation<a class=headerlink href=#schema-validation title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does this library support <abbr title="JavaScript Object Notation">JSON</abbr> Schema validation?</p> </div> <p>Not directly, but the companion project <a href="https://github.com/pboettch/json-schema-validator">json-schema-validator</a> builds <abbr title="JavaScript Object Notation">JSON</abbr> Schema (draft 7; draft 4 in its older, now-superseded 1.x releases) validation on top of this library and is a common recommendation for this use case.</p> <h3 id=memory-use>Memory use<a class=headerlink href=#memory-use title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does the library leak memory? My process stays large after I free a <code>json</code> value.</p> </div> <p>Destroying a value frees everything it owns. Freed memory is returned to the allocator, which does not necessarily give it back to the operating system, so a high resident size alone is not a leak. Copies are deep, and <code>clear()</code> keeps the capacity of an array. See <a href=../../features/performance/#memory>Memory</a>, and use Valgrind or the sanitizers to tell a leak from retained memory.</p> <h3 id=reproducible-builds>Reproducible builds<a class=headerlink href=#reproducible-builds title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>The header path ends up in my binary. How do I get path-independent builds?</p> </div> <p>The runtime assertions embed <code>__FILE__</code>. Define <code>NDEBUG</code> (the default for release builds) or map the path prefix; see <a href=../../integration/#notes-for-builds-and-distribution>Notes for builds and distribution</a>.</p> <h3 id=slow-debug-builds>Slow debug builds<a class=headerlink href=#slow-debug-builds title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Parsing a large file is very slow in my debug build. Can I compile the library with optimizations?</p> </div> <p>The library is header-only, so there is no separate source file. Keep the code that uses <code>json</code> in its own source file and compile that file with optimizations; see <a href=../../integration/#notes-for-builds-and-distribution>Notes for builds and distribution</a>.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <h3 id=parsing-without-exceptions>Parsing without exceptions<a class=headerlink href=#parsing-without-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is it possible to indicate a parse error without throwing an exception?</p> </div> <p>Yes, see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> and <a href=../../features/no_exceptions/ >Working without exceptions</a>.</p> <h3 id=key-name-in-exceptions>Key name in exceptions<a class=headerlink href=#key-name-in-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Can I get the key of the object item that caused an exception?</p> </div> <p>Yes, you can. Please define the symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to get <a href=../exceptions/#extended-diagnostic-messages>extended diagnostics messages</a>.</p> <h2 id=serialization-issues>Serialization issues<a class=headerlink href=#serialization-issues title="Permanent link">¶</a></h2> <h3 id=number-precision>Number precision<a class=headerlink href=#number-precision title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>It seems that precision is lost when serializing a double.</li> <li>Can I change the precision for floating-point serialization?</li> </ul> </div> <p>The library serializes floating-point numbers with tLine truncated
|
||||
<span class=k>const</span><span class=w> </span><span class=k>auto</span><span class=w> </span><span class=n>s</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>.</span><span class=n>dump</span><span class=p>(</span><span class=mi>-1</span><span class=p>,</span><span class=w> </span><span class=sc>' '</span><span class=p>,</span><span class=w> </span><span class=nb>false</span><span class=p>,</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>error_handler_t</span><span class=o>::</span><span class=n>replace</span><span class=p>);</span>
|
||||
</code></pre></div> <h3 id=using-json-values-with-stdformat-or-fmt>Using <abbr title="JavaScript Object Notation">JSON</abbr> values with <code>std::format</code> or <code>fmt</code><a class=headerlink href=#using-json-values-with-stdformat-or-fmt title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>Can I use <code>std::format("{}", j)</code> on a <abbr title="JavaScript Object Notation">JSON</abbr> value?</li> <li>Can I use <code>fmt::format("{}", j)</code> or <code>fmt::print("{}", j)</code> (the <a href="https://github.com/fmtlib/fmt">{fmt}</a> library) on a <abbr title="JavaScript Object Notation">JSON</abbr> value?</li> </ul> </div> <p><code>std::format</code> works out of the box since version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, as long as the standard library provides <code><format></code> (see <a href=../../api/macros/json_has_std_format/ ><code>JSON_HAS_STD_FORMAT</code></a>); see <a href=../../api/basic_json/std_formatter/ ><code>std::formatter<basic_json></code></a> for details, including the <code class=highlight><span class=s>"{:#}"</span></code> pretty-print spec, indent widths (<code class=highlight><span class=s>"{:2}"</span></code>), and custom indent characters (<code class=highlight><span class=s>"{:.>#}"</span></code>).</p> <p>For <code>fmt</code>, the library ships <a href=../../api/basic_json/format_as/ ><code>format_as</code></a>, a small customization point <code>fmt</code> looks for via argument-dependent lookup. It only has an effect on fmt 10.0.0 through 11.0.2 — from fmt 11.1.0 onwards, <code>fmt</code> no longer picks up a <code>format_as</code> overload that returns a <code>std::string</code>. On such versions (or any version, if you also want the same <code class=highlight><span class=s>"{:#}"</span></code>/width/fill-and-align spec support that <code>std::formatter<basic_json></code> has), define your own <code>fmt::formatter</code> specialization; see <a href=../../api/basic_json/format_as/ ><code>format_as</code></a> for a recipe that mirrors it.</p> <p>If you get ambiguous-overload errors when passing a <abbr title="JavaScript Object Notation">JSON</abbr> value to <code>fmt::format</code>/<code>fmt::print</code> without any <code>fmt::formatter<json></code> specialization in scope, that's <code>fmt</code> picking up <code>basic_json</code>'s implicit <code>operator ValueType()</code> conversion operator (see <a href="https://github.com/nlohmann/json/issues/964">#964</a> and <a href="https://github.com/nlohmann/json/issues/958">#958</a>); disabling it via <a href=../../api/macros/json_use_implicit_conversions/ ><code>JSON_USE_IMPLICIT_CONVERSIONS 0</code></a> avoids the ambiguity.</p> <h2 id=compilation-issues>Compilation issues<a class=headerlink href=#compilation-issues title="Permanent link">¶</a></h2> <h3 id=android-sdk>Android <abbr title="Software Development Kit">SDK</abbr><a class=headerlink href=#android-sdk title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Why does the code not compile with Android <abbr title="Software Development Kit">SDK</abbr>?</p> </div> <p>Since <a href="https://github.com/android/ndk/wiki/Changelog-r18"><abbr title="Native Development Kit">NDK</abbr> r18</a> (2018), <abbr title="GNU Compiler Collection">GCC</abbr> and the <code>gnustl</code>/<code>stlport</code> C++ libraries have been removed from the Android <abbr title="Native Development Kit">NDK</abbr>; Clang and <code>libc++</code> are now the only compiler and C++ library, and they support C++11 and later out of the box. With a current <abbr title="Native Development Kit">NDK</abbr>, no special configuration is needed to use this library.</p> <p>Only very old NDKs (before r18), which defaulted to <abbr title="GNU Compiler Collection">GCC</abbr> and <code>gnustl</code>, lacked C++11 library features such as <code>std::to_string</code>. If you run into this, update to a current <abbr title="Native Development Kit">NDK</abbr>.</p> <h3 id=incomplete-detector-type-with-gcc-11>Incomplete <code>detector</code> type with <abbr title="GNU Compiler Collection">GCC</abbr> < 11<a class=headerlink href=#incomplete-detector-type-with-gcc-11 title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Why does <abbr title="GNU Compiler Collection">GCC</abbr> 10 or older fail with <code>invalid use of incomplete type 'struct nlohmann::detail::detector<..., to_json_function, ...>'</code> for a type that holds an <code>optional</code> member?</p> </div> <p>This happens with <abbr title="GNU Compiler Collection">GCC</abbr> 10 and older in C++11/C++14 mode when all of these hold:</p> <ul> <li>a class <code>Holder</code> has an <code>optional<Dummy></code> member (e.g., <code>boost::optiLine truncated
|
||||
<span class=w> </span><span class=k>public</span><span class=o>:</span>
|
||||
@@ -56,4 +56,4 @@
|
||||
|
||||
<span class=w> </span><span class=k>friend</span><span class=w> </span><span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>Holder</span><span class=o>&</span><span class=w> </span><span class=n>h</span><span class=p>)</span><span class=w> </span><span class=p>{</span><span class=w> </span><span class=cm>/* ... */</span><span class=w> </span><span class=p>}</span>
|
||||
<span class=p>};</span>
|
||||
</code></pre></div> <p>The <a href=../../api/macros/nlohmann_define_type_intrusive/ ><code>NLOHMANN_DEFINE_TYPE_INTRUSIVE</code></a> macros define hidden friends as well. See <a href="https://github.com/nlohmann/json/issues/3669">#3669</a> for details.</p> <h3 id=missing-stl-function>Missing <abbr title="Standard Template Library">STL</abbr> function<a class=headerlink href=#missing-stl-function title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why do I get a compilation error <code>'to_string' is not a member of 'std'</code> (or similarly, for <code>strtod</code> or <code>strtof</code>)?</li> <li>Why does the code not compile with <abbr title="Minimalist GNU for Windows">MinGW</abbr> or Android <abbr title="Software Development Kit">SDK</abbr>?</li> </ul> </div> <p>This is not an issue with the code, but rather with the compiler itself. On Android, use a current <abbr title="Native Development Kit">NDK</abbr> (see above). For <abbr title="Minimalist GNU for Windows">MinGW</abbr>, please refer to <a href="http://tehsausage.com/mingw-to-string">this site</a> and <a href="https://github.com/nlohmann/json/issues/136">this discussion</a> for information on how to fix this bug.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 25, 2026 11:07:13 UTC">October 25, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontaweLine truncated
|
||||
</code></pre></div> <p>The <a href=../../api/macros/nlohmann_define_type_intrusive/ ><code>NLOHMANN_DEFINE_TYPE_INTRUSIVE</code></a> macros define hidden friends as well. See <a href="https://github.com/nlohmann/json/issues/3669">#3669</a> for details.</p> <h3 id=missing-stl-function>Missing <abbr title="Standard Template Library">STL</abbr> function<a class=headerlink href=#missing-stl-function title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why do I get a compilation error <code>'to_string' is not a member of 'std'</code> (or similarly, for <code>strtod</code> or <code>strtof</code>)?</li> <li>Why does the code not compile with <abbr title="Minimalist GNU for Windows">MinGW</abbr> or Android <abbr title="Software Development Kit">SDK</abbr>?</li> </ul> </div> <p>This is not an issue with the code, but rather with the compiler itself. On Android, use a current <abbr title="Native Development Kit">NDK</abbr> (see above). For <abbr title="Minimalist GNU for Windows">MinGW</abbr>, please refer to <a href="http://tehsausage.com/mingw-to-string">this site</a> and <a href="https://github.com/nlohmann/json/issues/136">this discussion</a> for information on how to fix this bug.</p> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../api/basic_json/ ><code>basic_json</code></a> - the main class and all its member functions</li> <li><a href=../../api/macros/ >Macros</a> - reference of all macros</li> <li><a href=../exceptions/ >Exceptions</a> - all exceptions and their error codes</li> <li><a href=../../features/ >Features</a> - overview of all features</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 27, 2026 06:41:42 UTC">October 27, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../license/ class="md-footer__link md-footer__link--prev" aria-label="Previous: License"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> License </div> </div> </a> <a href=../exceptions/ class="md-footer__link md-footer__link--next" aria-label="Next: Exceptions"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Exceptions </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 Line truncated
|
||||
+10
-3
@@ -20,7 +20,7 @@ json j(true);
|
||||
|
||||
yield different results (`[true]` vs. `true`)?
|
||||
|
||||
This is a known issue, and -- even worse -- the behavior differs between GCC and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like
|
||||
This is a known issue, and — even worse — the behavior differs between GCC and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like
|
||||
|
||||
```
|
||||
json array = {1, 2, 3, 4};
|
||||
@@ -166,7 +166,7 @@ Question
|
||||
|
||||
How do I check if a key exists, without changing the object?
|
||||
|
||||
Use `contains` or `find`. Do not test with the non-const `operator[]`: like `std::map::operator[]`, it inserts a `null` value for a missing key. See [Does this key exist?](https://json.nlohmann.me/features/element_access/#does-this-key-exist).
|
||||
Use `contains` or `find`. Do not test with the non-const `operator[]`: like `std::map::operator[]`, it inserts a `null` value for a missing key. See [Does this key exist?](https://json.nlohmann.me/features/element_access/#does-this-key-exist). For choosing between `value`, `contains`/`find`, `at`, `operator[]`, and JSON Pointer, see the decision flow in [Element access](https://json.nlohmann.me/features/element_access/index.md).
|
||||
|
||||
### Reading a value with a fallback
|
||||
|
||||
@@ -352,7 +352,7 @@ Question
|
||||
|
||||
Is `basic_json` thread-safe?
|
||||
|
||||
No. `basic_json` provides no built-in synchronization, the same as `std::map` or `std::vector`. Concurrent reads of the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent `json` objects. However, any concurrent write to a `json` object -- or a concurrent read while another thread writes to the same object -- is a data race and requires external synchronization (e.g., a `std::mutex`) by the caller.
|
||||
No. `basic_json` provides no built-in synchronization, the same as `std::map` or `std::vector`. Concurrent reads of the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent `json` objects. However, any concurrent write to a `json` object — or a concurrent read while another thread writes to the same object — is a data race and requires external synchronization (e.g., a `std::mutex`) by the caller.
|
||||
|
||||
### Schema validation
|
||||
|
||||
@@ -513,3 +513,10 @@ Questions
|
||||
- Why does the code not compile with MinGW or Android SDK?
|
||||
|
||||
This is not an issue with the code, but rather with the compiler itself. On Android, use a current NDK (see above). For MinGW, please refer to [this site](http://tehsausage.com/mingw-to-string) and [this discussion](https://github.com/nlohmann/json/issues/136) for information on how to fix this bug.
|
||||
|
||||
## See also
|
||||
|
||||
- [`basic_json`](https://json.nlohmann.me/api/basic_json/index.md) - the main class and all its member functions
|
||||
- [Macros](https://json.nlohmann.me/api/macros/index.md) - reference of all macros
|
||||
- [Exceptions](https://json.nlohmann.me/home/exceptions/index.md) - all exceptions and their error codes
|
||||
- [Features](https://json.nlohmann.me/features/index.md) - overview of all features
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/license/" rel="canonical"><link rel=prev href=../..><link href=../faq/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>License - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> License </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette 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6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-component=search role=diaLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/license/" rel="canonical"><link rel=prev href=../..><link href=../faq/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>License - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#license class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> License </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to dark 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4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 Line truncated
|
||||
+169
-43
@@ -14,6 +14,130 @@ changed in it. The API overview is generated from the "Version history" section
|
||||
[API pages](../../api/basic_json/index.md); it is not a change log, but helps to see whether a feature is available in
|
||||
the version you use.
|
||||
|
||||
All releases at a glance (hover a marker for its version and date):
|
||||
|
||||
<div class="nj-fig-wrap" markdown>
|
||||
<svg class="nj-fig nj-fig--timeline" viewBox="0 0 880 164" role="img" aria-labelledby="nj-int-tl-title" xmlns="http://www.w3.org/2000/svg">
|
||||
<title id="nj-int-tl-title">Timeline from the first commit (2013-07-04) and the 44 releases from v1.0.0 (2015-12-28) to v3.12.0 (2025-04-11): 17 minor or major releases, drawn as filled dots with their version above the axis, and 27 patch releases, drawn as rings. The first commit is drawn as a diamond.</title>
|
||||
<line class="nj-int-grid" x1="24.0" y1="78" x2="24.0" y2="102"/>
|
||||
<text class="nj-int-year" x="55.7" y="118">2013</text>
|
||||
<line class="nj-int-grid" x1="88.0" y1="78" x2="88.0" y2="102"/>
|
||||
<text class="nj-int-year" x="119.7" y="118">2014</text>
|
||||
<line class="nj-int-grid" x1="151.9" y1="78" x2="151.9" y2="102"/>
|
||||
<text class="nj-int-year" x="183.6" y="118">2015</text>
|
||||
<line class="nj-int-grid" x1="215.9" y1="78" x2="215.9" y2="102"/>
|
||||
<text class="nj-int-year" x="247.8" y="118">2016</text>
|
||||
<line class="nj-int-grid" x1="280.0" y1="78" x2="280.0" y2="102"/>
|
||||
<text class="nj-int-year" x="311.7" y="118">2017</text>
|
||||
<line class="nj-int-grid" x1="344.0" y1="78" x2="344.0" y2="102"/>
|
||||
<text class="nj-int-year" x="375.7" y="118">2018</text>
|
||||
<line class="nj-int-grid" x1="407.9" y1="78" x2="407.9" y2="102"/>
|
||||
<text class="nj-int-year" x="439.6" y="118">2019</text>
|
||||
<line class="nj-int-grid" x1="471.9" y1="78" x2="471.9" y2="102"/>
|
||||
<text class="nj-int-year" x="503.8" y="118">2020</text>
|
||||
<line class="nj-int-grid" x1="536.0" y1="78" x2="536.0" y2="102"/>
|
||||
<text class="nj-int-year" x="567.7" y="118">2021</text>
|
||||
<line class="nj-int-grid" x1="600.0" y1="78" x2="600.0" y2="102"/>
|
||||
<text class="nj-int-year" x="631.7" y="118">2022</text>
|
||||
<line class="nj-int-grid" x1="663.9" y1="78" x2="663.9" y2="102"/>
|
||||
<text class="nj-int-year" x="695.7" y="118">2023</text>
|
||||
<line class="nj-int-grid" x1="727.9" y1="78" x2="727.9" y2="102"/>
|
||||
<text class="nj-int-year" x="759.8" y="118">2024</text>
|
||||
<line class="nj-int-grid" x1="792.0" y1="78" x2="792.0" y2="102"/>
|
||||
<text class="nj-int-year" x="823.8" y="118">2025</text>
|
||||
<line class="nj-int-grid" x1="856.0" y1="78" x2="856.0" y2="102"/>
|
||||
<line class="nj-int-axis" x1="24" y1="94" x2="856" y2="94"/>
|
||||
<path class="nj-int-axis" fill="none" d="M215.2 131 V136 H219.9 V131"/>
|
||||
<text class="nj-int-major" x="215.2" y="153" text-anchor="start">1.x</text>
|
||||
<path class="nj-int-axis" fill="none" d="M246.5 131 V136 H289.7 V131"/>
|
||||
<text class="nj-int-major" x="268.1" y="153" text-anchor="middle">2.x</text>
|
||||
<path class="nj-int-axis" fill="none" d="M341.3 131 V136 H809.6 V131"/>
|
||||
<text class="nj-int-major" x="575.5" y="153" text-anchor="middle">3.x</text>
|
||||
<line class="nj-int-leader" x1="56.2" y1="85" x2="56.2" y2="87"/>
|
||||
<text class="nj-int-label" x="56.2" y="82">first commit</text>
|
||||
<line class="nj-int-leader" x1="215.2" y1="85" x2="215.2" y2="87"/>
|
||||
<text class="nj-int-label" x="215.2" y="82">1.0</text>
|
||||
<line class="nj-int-leader" x1="219.9" y1="68" x2="219.9" y2="87"/>
|
||||
<text class="nj-int-label" x="219.9" y="65">1.1</text>
|
||||
<line class="nj-int-leader" x1="246.5" y1="85" x2="246.5" y2="87"/>
|
||||
<text class="nj-int-label" x="246.5" y="82">2.0</text>
|
||||
<line class="nj-int-leader" x1="284.7" y1="85" x2="284.7" y2="87"/>
|
||||
<text class="nj-int-label" x="284.7" y="82">2.1</text>
|
||||
<line class="nj-int-leader" x1="341.3" y1="85" x2="341.3" y2="87"/>
|
||||
<text class="nj-int-label" x="341.3" y="82">3.0</text>
|
||||
<line class="nj-int-leader" x1="349.4" y1="68" x2="349.4" y2="87"/>
|
||||
<text class="nj-int-label" x="349.4" y="65">3.1</text>
|
||||
<line class="nj-int-leader" x1="384.5" y1="85" x2="384.5" y2="87"/>
|
||||
<text class="nj-int-label" x="384.5" y="82">3.2</text>
|
||||
<line class="nj-int-leader" x1="392.5" y1="68" x2="392.5" y2="87"/>
|
||||
<text class="nj-int-label" x="392.5" y="65">3.3</text>
|
||||
<line class="nj-int-leader" x1="396.9" y1="51" x2="396.9" y2="87"/>
|
||||
<text class="nj-int-label" x="396.9" y="48">3.4</text>
|
||||
<line class="nj-int-leader" x1="406.2" y1="34" x2="406.2" y2="87"/>
|
||||
<text class="nj-int-label" x="406.2" y="31">3.5</text>
|
||||
<line class="nj-int-leader" x1="421.6" y1="85" x2="421.6" y2="87"/>
|
||||
<text class="nj-int-label" x="421.6" y="82">3.6</text>
|
||||
<line class="nj-int-leader" x1="444.4" y1="68" x2="444.4" y2="87"/>
|
||||
<text class="nj-int-label" x="444.4" y="65">3.7</text>
|
||||
<line class="nj-int-leader" x1="500.8" y1="85" x2="500.8" y2="87"/>
|
||||
<text class="nj-int-label" x="500.8" y="82">3.8</text>
|
||||
<line class="nj-int-leader" x1="508.3" y1="68" x2="508.3" y2="87"/>
|
||||
<text class="nj-int-label" x="508.3" y="65">3.9</text>
|
||||
<line class="nj-int-leader" x1="576.0" y1="85" x2="576.0" y2="87"/>
|
||||
<text class="nj-int-label" x="576.0" y="82">3.10</text>
|
||||
<line class="nj-int-leader" x1="637.1" y1="85" x2="637.1" y2="87"/>
|
||||
<text class="nj-int-label" x="637.1" y="82">3.11</text>
|
||||
<line class="nj-int-leader" x1="809.6" y1="85" x2="809.6" y2="87"/>
|
||||
<text class="nj-int-label" x="809.6" y="82">3.12</text>
|
||||
<g><title>First commit 2013-07-04</title><circle class="nj-int-hit" cx="56.2" cy="94" r="9"/><path class="nj-int-minor" d="M56.2 94 l7 -7 l7 7 l-7 7z" transform="translate(-7 0)"/></g>
|
||||
<g><title>v2.0.1 released 2016-06-28</title><circle class="nj-int-hit" cx="247.2" cy="94" r="9"/><circle class="nj-int-patch" cx="247.2" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.2 released 2016-07-31</title><circle class="nj-int-hit" cx="253.0" cy="94" r="9"/><circle class="nj-int-patch" cx="253.0" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.3 released 2016-08-31</title><circle class="nj-int-hit" cx="258.5" cy="94" r="9"/><circle class="nj-int-patch" cx="258.5" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.4 released 2016-09-11</title><circle class="nj-int-hit" cx="260.4" cy="94" r="9"/><circle class="nj-int-patch" cx="260.4" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.5 released 2016-09-14</title><circle class="nj-int-hit" cx="260.9" cy="94" r="9"/><circle class="nj-int-patch" cx="260.9" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.6 released 2016-10-15</title><circle class="nj-int-hit" cx="266.3" cy="94" r="9"/><circle class="nj-int-patch" cx="266.3" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.7 released 2016-11-02</title><circle class="nj-int-hit" cx="269.5" cy="94" r="9"/><circle class="nj-int-patch" cx="269.5" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.8 released 2016-12-02</title><circle class="nj-int-hit" cx="274.8" cy="94" r="9"/><circle class="nj-int-patch" cx="274.8" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.9 released 2016-12-16</title><circle class="nj-int-hit" cx="277.2" cy="94" r="9"/><circle class="nj-int-patch" cx="277.2" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.0.10 released 2017-01-02</title><circle class="nj-int-hit" cx="280.2" cy="94" r="9"/><circle class="nj-int-patch" cx="280.2" cy="94" r="3.5"/></g>
|
||||
<g><title>v2.1.1 released 2017-02-25</title><circle class="nj-int-hit" cx="289.7" cy="94" r="9"/><circle class="nj-int-patch" cx="289.7" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.0.1 released 2017-12-29</title><circle class="nj-int-hit" cx="343.4" cy="94" r="9"/><circle class="nj-int-patch" cx="343.4" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.1.1 released 2018-02-13</title><circle class="nj-int-hit" cx="351.5" cy="94" r="9"/><circle class="nj-int-patch" cx="351.5" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.1.2 released 2018-03-14</title><circle class="nj-int-hit" cx="356.6" cy="94" r="9"/><circle class="nj-int-patch" cx="356.6" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.7.1 released 2019-11-06</title><circle class="nj-int-hit" cx="462.1" cy="94" r="9"/><circle class="nj-int-patch" cx="462.1" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.7.2 released 2019-11-10</title><circle class="nj-int-hit" cx="462.8" cy="94" r="9"/><circle class="nj-int-patch" cx="462.8" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.7.3 released 2019-11-17</title><circle class="nj-int-hit" cx="464.0" cy="94" r="9"/><circle class="nj-int-patch" cx="464.0" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.9.1 released 2020-08-06</title><circle class="nj-int-hit" cx="510.1" cy="94" r="9"/><circle class="nj-int-patch" cx="510.1" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.10.1 released 2021-08-24</title><circle class="nj-int-hit" cx="577.2" cy="94" r="9"/><circle class="nj-int-patch" cx="577.2" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.10.2 released 2021-08-26</title><circle class="nj-int-hit" cx="577.6" cy="94" r="9"/><circle class="nj-int-patch" cx="577.6" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.10.3 released 2021-10-08</title><circle class="nj-int-hit" cx="585.1" cy="94" r="9"/><circle class="nj-int-patch" cx="585.1" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.10.4 released 2021-10-16</title><circle class="nj-int-hit" cx="586.5" cy="94" r="9"/><circle class="nj-int-patch" cx="586.5" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.10.5 released 2022-01-03</title><circle class="nj-int-hit" cx="600.3" cy="94" r="9"/><circle class="nj-int-patch" cx="600.3" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.11.2 released 2022-08-12</title><circle class="nj-int-hit" cx="639.1" cy="94" r="9"/><circle class="nj-int-patch" cx="639.1" cy="94" r="3.5"/></g>
|
||||
<g><title>v3.11.3 released 2023-11-28</title><circle class="nj-int-hit" cx="721.9" cy="94" r="9"/><circle class="nj-int-patch" cx="721.9" cy="94" r="3.5"/></g>
|
||||
<g><title>v1.0.0 released 2015-12-28</title><circle class="nj-int-hit" cx="215.2" cy="94" r="9"/><circle class="nj-int-minor" cx="215.2" cy="94" r="6"/></g>
|
||||
<g><title>v1.1.0 released 2016-01-24</title><circle class="nj-int-hit" cx="219.9" cy="94" r="9"/><circle class="nj-int-minor" cx="219.9" cy="94" r="6"/></g>
|
||||
<g><title>v2.0.0 released 2016-06-24</title><circle class="nj-int-hit" cx="246.5" cy="94" r="9"/><circle class="nj-int-minor" cx="246.5" cy="94" r="6"/></g>
|
||||
<g><title>v2.1.0 released 2017-01-28</title><circle class="nj-int-hit" cx="284.7" cy="94" r="9"/><circle class="nj-int-minor" cx="284.7" cy="94" r="6"/></g>
|
||||
<g><title>v3.0.0 released 2017-12-17</title><circle class="nj-int-hit" cx="341.3" cy="94" r="9"/><circle class="nj-int-minor" cx="341.3" cy="94" r="6"/></g>
|
||||
<g><title>v3.1.0 released 2018-02-01</title><circle class="nj-int-hit" cx="349.4" cy="94" r="9"/><circle class="nj-int-minor" cx="349.4" cy="94" r="6"/></g>
|
||||
<g><title>v3.2.0 released 2018-08-20</title><circle class="nj-int-hit" cx="384.5" cy="94" r="9"/><circle class="nj-int-minor" cx="384.5" cy="94" r="6"/></g>
|
||||
<g><title>v3.3.0 released 2018-10-05</title><circle class="nj-int-hit" cx="392.5" cy="94" r="9"/><circle class="nj-int-minor" cx="392.5" cy="94" r="6"/></g>
|
||||
<g><title>v3.4.0 released 2018-10-30</title><circle class="nj-int-hit" cx="396.9" cy="94" r="9"/><circle class="nj-int-minor" cx="396.9" cy="94" r="6"/></g>
|
||||
<g><title>v3.5.0 released 2018-12-22</title><circle class="nj-int-hit" cx="406.2" cy="94" r="9"/><circle class="nj-int-minor" cx="406.2" cy="94" r="6"/></g>
|
||||
<g><title>v3.6.0, v3.6.1 released 2019-03-20</title><circle class="nj-int-hit" cx="421.6" cy="94" r="9"/><circle class="nj-int-minor" cx="421.6" cy="94" r="6"/></g>
|
||||
<g><title>v3.7.0 released 2019-07-28</title><circle class="nj-int-hit" cx="444.4" cy="94" r="9"/><circle class="nj-int-minor" cx="444.4" cy="94" r="6"/></g>
|
||||
<g><title>v3.8.0 released 2020-06-14</title><circle class="nj-int-hit" cx="500.8" cy="94" r="9"/><circle class="nj-int-minor" cx="500.8" cy="94" r="6"/></g>
|
||||
<g><title>v3.9.0 released 2020-07-27</title><circle class="nj-int-hit" cx="508.3" cy="94" r="9"/><circle class="nj-int-minor" cx="508.3" cy="94" r="6"/></g>
|
||||
<g><title>v3.10.0 released 2021-08-17</title><circle class="nj-int-hit" cx="576.0" cy="94" r="9"/><circle class="nj-int-minor" cx="576.0" cy="94" r="6"/></g>
|
||||
<g><title>v3.11.0, v3.11.1 released 2022-08-01</title><circle class="nj-int-hit" cx="637.1" cy="94" r="9"/><circle class="nj-int-minor" cx="637.1" cy="94" r="6"/></g>
|
||||
<g><title>v3.12.0 released 2025-04-11</title><circle class="nj-int-hit" cx="809.6" cy="94" r="9"/><circle class="nj-int-minor" cx="809.6" cy="94" r="6"/></g>
|
||||
</svg>
|
||||
|
||||
</div>
|
||||
|
||||
<p class="nj-caption" markdown>From the first commit (diamond) in 2013 to the latest release, on a time axis by year. Filled dots with a version label are minor or major releases, rings are patch releases.</p>
|
||||
|
||||
## Unreleased
|
||||
|
||||
| Release | Date | Summary |
|
||||
@@ -24,124 +148,124 @@ the version you use.
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.12.0](v3.12.0.md) | 2025-04-11 | Fixes bugs found in 3.11.3 and adds several features. No public API was removed or renamed. |
|
||||
| [v3.12.0](v3.12.0.md) | 2025-04-11 | Fixes bugs found in 3.11.3 and adds several features. No public API was removed or renamed. **Highlights:** diagnostic byte positions (`start_pos`/`end_pos`); templated conversion macros and `NLOHMANN_DEFINE_DERIVED_TYPE`; `std::optional` support. |
|
||||
|
||||
## Version 3.11.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.11.3](v3.11.3.md) | 2023-11-28 | Adds features and fixes bugs found in 3.11.2. All changes are backward-compatible. |
|
||||
| [v3.11.2](v3.11.2.md) | 2022-08-12 | Fixes bugs found in 3.11.1 and restructures the namespace. All changes are backward-compatible. |
|
||||
| [v3.11.1](v3.11.1.md) | 2022-08-01 | Fixes a regression from 3.11.0. All changes are backward-compatible. |
|
||||
| [v3.11.0](v3.11.0.md) | 2022-08-01 | One of the largest releases ever. All changes are backward-compatible. |
|
||||
| [v3.11.3](v3.11.3.md) | 2023-11-28 | Adds features and fixes bugs found in 3.11.2. All changes are backward-compatible. **Highlights:** custom base class for `basic_json`; serialization-only conversion macros; Bazel and Swift Package Manager support. |
|
||||
| [v3.11.2](v3.11.2.md) | 2022-08-12 | Fixes bugs found in 3.11.1 and restructures the namespace. All changes are backward-compatible. **Highlights:** fixes `value` for strings and size types; restores `json_pointer` as associative-container key; restructured inline namespace. |
|
||||
| [v3.11.1](v3.11.1.md) | 2022-08-01 | Fixes a regression from 3.11.0. All changes are backward-compatible. **Highlights:** restores the global `_json` and `_json_pointer` literals. |
|
||||
| [v3.11.0](v3.11.0.md) | 2022-08-01 | One of the largest releases ever. All changes are backward-compatible. **Highlights:** `std::string_view` keys; BJData binary format; C++20 support including `operator<=>`. |
|
||||
|
||||
## Version 3.10.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.10.5](v3.10.5.md) | 2022-01-03 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.10.4](v3.10.4.md) | 2021-10-16 | Fixes regressions introduced in 3.10.0. All changes are backward-compatible. |
|
||||
| [v3.10.3](v3.10.3.md) | 2021-10-08 | Fixes more regressions from 3.10.0. All changes are backward-compatible. |
|
||||
| [v3.10.2](v3.10.2.md) | 2021-08-26 | Re-release of 3.10.1, whose Git tag pointed at the wrong commit due to a bug in the release script. All changes are backward-compatible. |
|
||||
| [v3.10.1](v3.10.1.md) | 2021-08-24 | Fixes a regression from 3.10.0. All changes are backward-compatible. |
|
||||
| [v3.10.0](v3.10.0.md) | 2021-08-17 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.10.5](v3.10.5.md) | 2022-01-03 | Bug-fix release. All changes are backward-compatible. **Highlights:** guards the `std::filesystem` conversions with `JSON_HAS_FILESYSTEM`. |
|
||||
| [v3.10.4](v3.10.4.md) | 2021-10-16 | Fixes regressions introduced in 3.10.0. All changes are backward-compatible. **Highlights:** fixes the `std::filesystem::path` conversion; fixes types with explicit defaulted constructors; fixes `std::find`/`std::remove` return values. |
|
||||
| [v3.10.3](v3.10.3.md) | 2021-10-08 | Fixes more regressions from 3.10.0. All changes are backward-compatible. **Highlights:** fixes extended-diagnostics assertions in `update` and array insertion; custom allocators for binary output; conversion from `begin()`/`end()`-only types. |
|
||||
| [v3.10.2](v3.10.2.md) | 2021-08-26 | Re-release of 3.10.1, whose Git tag pointed at the wrong commit due to a bug in the release script. All changes are backward-compatible. **Highlights:** re-release of 3.10.1 with the correct Git tag. |
|
||||
| [v3.10.1](v3.10.1.md) | 2021-08-24 | Fixes a regression from 3.10.0. All changes are backward-compatible. **Highlights:** fixes an extended-diagnostics assertion with `ordered_json`; hardens the GDB pretty-printer. |
|
||||
| [v3.10.0](v3.10.0.md) | 2021-08-17 | Feature release. All changes are backward-compatible. **Highlights:** extended diagnostic messages (`JSON_DIAGNOSTICS`); GDB pretty-printer; CBOR tag storage. |
|
||||
|
||||
## Version 3.9.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.9.1](v3.9.1.md) | 2020-08-06 | Fixes two regressions from 3.9.0. All changes are backward-compatible. |
|
||||
| [v3.9.0](v3.9.0.md) | 2020-07-27 | Feature release adding four long-requested features. All changes are backward-compatible. |
|
||||
| [v3.9.1](v3.9.1.md) | 2020-08-06 | Fixes two regressions from 3.9.0. All changes are backward-compatible. **Highlights:** accepts consecutive comments; completes the `ordered_json` interface. |
|
||||
| [v3.9.0](v3.9.0.md) | 2020-07-27 | Feature release adding four long-requested features. All changes are backward-compatible. **Highlights:** comment parsing; `ordered_json`; switch to disable implicit conversions. |
|
||||
|
||||
## Version 3.8.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.8.0](v3.8.0.md) | 2020-06-14 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.8.0](v3.8.0.md) | 2020-06-14 | Feature release. All changes are backward-compatible. **Highlights:** binary value type for CBOR, BSON, and MessagePack; input adapters for any `LegacyInputIterator` container; fixes `contains` for JSON pointers. |
|
||||
|
||||
## Version 3.7.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.7.3](v3.7.3.md) | 2019-11-17 | Fixes a regression from 3.7.2 that could yield quadratic complexity in destructor calls. All changes are backward-compatible. |
|
||||
| [v3.7.2](v3.7.2.md) | 2019-11-10 | Fixes a stack overflow for deeply nested input by making the destructor iterative; parsing of JSON text is now bounded only by available memory (the binary-format parsers still recurse). All changes are backward-compatible. |
|
||||
| [v3.7.1](v3.7.1.md) | 2019-11-06 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.7.0](v3.7.0.md) | 2019-07-28 | Convenience features and house-keeping. All changes are backward-compatible. |
|
||||
| [v3.7.3](v3.7.3.md) | 2019-11-17 | Fixes a regression from 3.7.2 that could yield quadratic complexity in destructor calls. All changes are backward-compatible. **Highlights:** fixes quadratic complexity in destructor calls. |
|
||||
| [v3.7.2](v3.7.2.md) | 2019-11-10 | Fixes a stack overflow for deeply nested input by making the destructor iterative; parsing of JSON text is now bounded only by available memory (the binary-format parsers still recurse). All changes are backward-compatible. **Highlights:** iterative destructor fixes a stack overflow on deeply nested input. |
|
||||
| [v3.7.1](v3.7.1.md) | 2019-11-06 | Bug-fix release. All changes are backward-compatible. **Highlights:** fixes a crash when serializing the minimum `std::int64_t`; fixes `contains` for JSON pointers; `items` with custom string types. |
|
||||
| [v3.7.0](v3.7.0.md) | 2019-07-28 | Convenience features and house-keeping. All changes are backward-compatible. **Highlights:** `contains` overload for JSON pointers; generic `to_string`; return value for `emplace_back`. |
|
||||
|
||||
## Version 3.6.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.6.1](v3.6.1.md) | 2019-03-20 | Fixes a regression (GCC 7/8 compilation) and a `<Windows.h>` build error introduced in 3.6.0. All changes are backward-compatible. |
|
||||
| [v3.6.0](v3.6.0.md) | 2019-03-20 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.6.1](v3.6.1.md) | 2019-03-20 | Fixes a regression (GCC 7/8 compilation) and a `<Windows.h>` build error introduced in 3.6.0. All changes are backward-compatible. **Highlights:** fixes a GCC 7/8 compilation regression; fixes a `<Windows.h>` build error. |
|
||||
| [v3.6.0](v3.6.0.md) | 2019-03-20 | Feature release. All changes are backward-compatible. **Highlights:** reworked JSON pointer interface; `contains` function; faster integer serialization. |
|
||||
|
||||
## Version 3.5.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.5.0](v3.5.0.md) | 2018-12-22 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.5.0](v3.5.0.md) | 2018-12-22 | Feature release. All changes are backward-compatible. **Highlights:** structured bindings via `items`; reading from `FILE*`; fixes `eofbit` handling on streams. |
|
||||
|
||||
## Version 3.4.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.4.0](v3.4.0.md) | 2018-10-30 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.4.0](v3.4.0.md) | 2018-10-30 | Feature release. All changes are backward-compatible. **Highlights:** BSON support; Unicode error handlers for `dump`; `NLOHMANN_JSON_SERIALIZE_ENUM`. |
|
||||
|
||||
## Version 3.3.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.3.0](v3.3.0.md) | 2018-10-05 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.3.0](v3.3.0.md) | 2018-10-05 | Feature release. All changes are backward-compatible. **Highlights:** GCC 4.8 support; `get_to`; overhauled CMake integration. |
|
||||
|
||||
## Version 3.2.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.2.0](v3.2.0.md) | 2018-08-20 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.2.0](v3.2.0.md) | 2018-08-20 | Feature release. All changes are backward-compatible. **Highlights:** SAX interface and non-recursive parser; parsing from wide strings; conversion to `std::string_view`. |
|
||||
|
||||
## Version 3.1.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.1.2](v3.1.2.md) | 2018-03-14 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.1.1](v3.1.1.md) | 2018-02-13 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.1.0](v3.1.0.md) | 2018-02-01 | Feature release. All changes are backward-compatible. |
|
||||
| [v3.1.2](v3.1.2.md) | 2018-03-14 | Bug-fix release. All changes are backward-compatible. **Highlights:** fixes a memory leak in the parser callback; user-defined string types in parser and serializer. |
|
||||
| [v3.1.1](v3.1.1.md) | 2018-02-13 | Bug-fix release. All changes are backward-compatible. **Highlights:** fixes parsing of indefinite-length CBOR strings; fixes a user-defined conversion to vector types; fixes UBJSON overflow detection. |
|
||||
| [v3.1.0](v3.1.0.md) | 2018-02-01 | Feature release. All changes are backward-compatible. **Highlights:** UBJSON support; JSON Merge Patch; Grisu2 floating-point output. |
|
||||
|
||||
## Version 3.0.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v3.0.1](v3.0.1.md) | 2017-12-29 | Fixes small issues in the [JSON Pointer](../../features/json_pointer.md) and [JSON Patch](../../features/json_patch.md) implementations (invalid "copy" targets and non-integer array indices). All changes are backward-compatible. |
|
||||
| [v3.0.0](v3.0.0.md) | 2017-12-17 | First 3.x release — a major release with breaking changes (see the [migration guide](../../integration/migration_guide.md)). |
|
||||
| [v3.0.1](v3.0.1.md) | 2017-12-29 | Fixes small issues in the [JSON Pointer](../../features/json_pointer.md) and [JSON Patch](../../features/json_patch.md) implementations (invalid "copy" targets and non-integer array indices). All changes are backward-compatible. **Highlights:** fixes invalid JSON Patch "copy" targets; fixes non-integer array indices in JSON Pointer. |
|
||||
| [v3.0.0](v3.0.0.md) | 2017-12-17 | First 3.x release — a major release with breaking changes (see the [migration guide](../../integration/migration_guide.md)). **Highlights:** user-defined exceptions with identifiers; non-throwing `accept` and `allow_exceptions`; `update` to merge objects. |
|
||||
|
||||
## Version 2.1.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v2.1.1](v2.1.1.md) | 2017-02-25 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v2.1.0](v2.1.0.md) | 2017-01-28 | Feature release. All changes are backward-compatible. |
|
||||
| [v2.1.1](v2.1.1.md) | 2017-02-25 | Bug-fix release. All changes are backward-compatible. **Highlights:** locale-independent number parsing and serialization; correct floating-point round-tripping; GPG-signed commits and files. |
|
||||
| [v2.1.0](v2.1.0.md) | 2017-01-28 | Feature release. All changes are backward-compatible. **Highlights:** conversions from and to arbitrary user-defined types; `meta` function; `JSON_NOEXCEPTION`. |
|
||||
|
||||
## Version 2.0.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v2.0.10](v2.0.10.md) | 2017-01-02 | Fixes several security-relevant bugs in the CBOR and MessagePack parsers found by OSS-Fuzz. All changes are backward-compatible. |
|
||||
| [v2.0.9](v2.0.9.md) | 2016-12-16 | Adds the [CBOR](../../features/binary_formats/cbor.md) and [MessagePack](../../features/binary_formats/messagepack.md) binary formats. All changes are backward-compatible. |
|
||||
| [v2.0.8](v2.0.8.md) | 2016-12-02 | Adds the [`emplace`](../../api/basic_json/emplace.md) and [`emplace_back`](../../api/basic_json/emplace_back.md) functions and improves parsing and serialization performance. All changes are backward-compatible. |
|
||||
| [v2.0.7](v2.0.7.md) | 2016-11-02 | Fixes several parser bugs found through the "Parsing JSON is a Minefield" study (short files, encoding detection, surrogate pairs). All changes are backward-compatible. |
|
||||
| [v2.0.6](v2.0.6.md) | 2016-10-15 | Fixes [`operator[]`](../../api/basic_json/operator%5B%5D.md) for [JSON pointers](../../features/json_pointer.md) so that it creates missing values like the other overloads. All changes are backward-compatible. |
|
||||
| [v2.0.5](v2.0.5.md) | 2016-09-14 | Fixes a remaining stream end-of-file detection bug in the parser. All changes are backward-compatible. |
|
||||
| [v2.0.4](v2.0.4.md) | 2016-09-11 | Fixes stream end-of-file detection in the parser. All changes are backward-compatible. |
|
||||
| [v2.0.3](v2.0.3.md) | 2016-08-31 | Generalizes the parser to accept any contiguous sequence of one-byte elements and deprecates the input-stream constructor in favor of the [`parse`](../../api/basic_json/parse.md) function. All changes are backward-compatible. |
|
||||
| [v2.0.2](v2.0.2.md) | 2016-07-31 | Overhauls the parser (now rejecting unescaped control characters), tightens the class invariants, and cleans up the code. All changes are backward-compatible. |
|
||||
| [v2.0.1](v2.0.1.md) | 2016-06-28 | Fixes a performance regression in the [`dump`](../../api/basic_json/dump.md) function by adjusting the stream locale once per serialization. All changes are backward-compatible. |
|
||||
| [v2.0.0](v2.0.0.md) | 2016-06-24 | Feature release with a minor (potentially non-backward-compatible) API change from added `noexcept` and `constexpr` specifiers. |
|
||||
| [v2.0.10](v2.0.10.md) | 2017-01-02 | Fixes several security-relevant bugs in the CBOR and MessagePack parsers found by OSS-Fuzz. All changes are backward-compatible. **Highlights:** fixes security-relevant bugs in the CBOR parser; fixes security-relevant bugs in the MessagePack parser. |
|
||||
| [v2.0.9](v2.0.9.md) | 2016-12-16 | Adds the [CBOR](../../features/binary_formats/cbor.md) and [MessagePack](../../features/binary_formats/messagepack.md) binary formats. All changes are backward-compatible. **Highlights:** CBOR support; MessagePack support. |
|
||||
| [v2.0.8](v2.0.8.md) | 2016-12-02 | Adds the [`emplace`](../../api/basic_json/emplace.md) and [`emplace_back`](../../api/basic_json/emplace_back.md) functions and improves parsing and serialization performance. All changes are backward-compatible. **Highlights:** `emplace` and `emplace_back`; faster parsing; faster serialization. |
|
||||
| [v2.0.7](v2.0.7.md) | 2016-11-02 | Fixes several parser bugs found through the "Parsing JSON is a Minefield" study (short files, encoding detection, surrogate pairs). All changes are backward-compatible. **Highlights:** fixes short-file handling; fixes encoding detection; fixes surrogate pairs. |
|
||||
| [v2.0.6](v2.0.6.md) | 2016-10-15 | Fixes [`operator[]`](../../api/basic_json/operator%5B%5D.md) for [JSON pointers](../../features/json_pointer.md) so that it creates missing values like the other overloads. All changes are backward-compatible. **Highlights:** `operator[]` creates missing values for JSON pointers. |
|
||||
| [v2.0.5](v2.0.5.md) | 2016-09-14 | Fixes a remaining stream end-of-file detection bug in the parser. All changes are backward-compatible. **Highlights:** fixes a remaining stream end-of-file bug. |
|
||||
| [v2.0.4](v2.0.4.md) | 2016-09-11 | Fixes stream end-of-file detection in the parser. All changes are backward-compatible. **Highlights:** fixes stream end-of-file detection. |
|
||||
| [v2.0.3](v2.0.3.md) | 2016-08-31 | Generalizes the parser to accept any contiguous sequence of one-byte elements and deprecates the input-stream constructor in favor of the [`parse`](../../api/basic_json/parse.md) function. All changes are backward-compatible. **Highlights:** parser accepts any contiguous sequence of one-byte elements; deprecates the input-stream constructor in favor of `parse`. |
|
||||
| [v2.0.2](v2.0.2.md) | 2016-07-31 | Overhauls the parser (now rejecting unescaped control characters), tightens the class invariants, and cleans up the code. All changes are backward-compatible. **Highlights:** overhauled parser rejecting unescaped control characters; tighter class invariants; code cleanup. |
|
||||
| [v2.0.1](v2.0.1.md) | 2016-06-28 | Fixes a performance regression in the [`dump`](../../api/basic_json/dump.md) function by adjusting the stream locale once per serialization. All changes are backward-compatible. **Highlights:** fixes a performance regression in `dump`. |
|
||||
| [v2.0.0](v2.0.0.md) | 2016-06-24 | Feature release with a minor (potentially non-backward-compatible) API change from added `noexcept` and `constexpr` specifiers. **Highlights:** JSON Pointer support in `at` and `operator[]`, plus `flatten` and `unflatten`; JSON Patch via `diff` and `patch`; unsigned 64-bit integers. |
|
||||
|
||||
## Version 1.1.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
|---------|------|---------|
|
||||
| [v1.1.0](v1.1.0.md) | 2016-01-24 | Bug-fix and feature release. All changes are backward-compatible. |
|
||||
| [v1.1.0](v1.1.0.md) | 2016-01-24 | Bug-fix and feature release. All changes are backward-compatible. **Highlights:** improved floating-point round-tripping; `get_ref`; runtime assertions. |
|
||||
|
||||
## Version 1.0.x
|
||||
|
||||
@@ -153,3 +277,5 @@ the version you use.
|
||||
|
||||
- [Migration Guide](../../integration/migration_guide.md) — how to future-proof your code for the next
|
||||
major version and replace deprecated functions.
|
||||
- [Roadmap: Version 4.0](../../community/roadmap.md#version-40) — what the next major version will change and how to
|
||||
try it today.
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/" rel="canonical"><link href=../exceptions/ rel=prev><link href=unreleased/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Overview - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/" rel="canonical"><link href=../exceptions/ rel=prev><link href=unreleased/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Overview - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet 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data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Overview </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default 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12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.Line truncated
|
||||
+80
-75
@@ -8,6 +8,10 @@ This documentation is built from the `develop` branch and may describe changes t
|
||||
|
||||
Every release has its own page with a summary of its notable changes and an overview of the API that was added or changed in it. The API overview is generated from the "Version history" section of the [API pages](https://json.nlohmann.me/api/basic_json/index.md); it is not a change log, but helps to see whether a feature is available in the version you use.
|
||||
|
||||
All releases at a glance (hover a marker for its version and date):
|
||||
|
||||
From the first commit (diamond) in 2013 to the latest release, on a time axis by year. Filled dots with a version label are minor or major releases, rings are patch releases.
|
||||
|
||||
## Unreleased
|
||||
|
||||
| Release | Date | Summary |
|
||||
@@ -16,126 +20,126 @@ Every release has its own page with a summary of its notable changes and an over
|
||||
|
||||
## Version 3.12.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | ------------------------------------------------------------------------------------------- |
|
||||
| [v3.12.0](https://json.nlohmann.me/home/releases/v3.12.0/index.md) | 2025-04-11 | Fixes bugs found in 3.11.3 and adds several features. No public API was removed or renamed. |
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.12.0](https://json.nlohmann.me/home/releases/v3.12.0/index.md) | 2025-04-11 | Fixes bugs found in 3.11.3 and adds several features. No public API was removed or renamed. **Highlights:** diagnostic byte positions (`start_pos`/`end_pos`); templated conversion macros and `NLOHMANN_DEFINE_DERIVED_TYPE`; `std::optional` support. |
|
||||
|
||||
## Version 3.11.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | ----------------------------------------------------------------------------------------------- |
|
||||
| [v3.11.3](https://json.nlohmann.me/home/releases/v3.11.3/index.md) | 2023-11-28 | Adds features and fixes bugs found in 3.11.2. All changes are backward-compatible. |
|
||||
| [v3.11.2](https://json.nlohmann.me/home/releases/v3.11.2/index.md) | 2022-08-12 | Fixes bugs found in 3.11.1 and restructures the namespace. All changes are backward-compatible. |
|
||||
| [v3.11.1](https://json.nlohmann.me/home/releases/v3.11.1/index.md) | 2022-08-01 | Fixes a regression from 3.11.0. All changes are backward-compatible. |
|
||||
| [v3.11.0](https://json.nlohmann.me/home/releases/v3.11.0/index.md) | 2022-08-01 | One of the largest releases ever. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.11.3](https://json.nlohmann.me/home/releases/v3.11.3/index.md) | 2023-11-28 | Adds features and fixes bugs found in 3.11.2. All changes are backward-compatible. **Highlights:** custom base class for `basic_json`; serialization-only conversion macros; Bazel and Swift Package Manager support. |
|
||||
| [v3.11.2](https://json.nlohmann.me/home/releases/v3.11.2/index.md) | 2022-08-12 | Fixes bugs found in 3.11.1 and restructures the namespace. All changes are backward-compatible. **Highlights:** fixes `value` for strings and size types; restores `json_pointer` as associative-container key; restructured inline namespace. |
|
||||
| [v3.11.1](https://json.nlohmann.me/home/releases/v3.11.1/index.md) | 2022-08-01 | Fixes a regression from 3.11.0. All changes are backward-compatible. **Highlights:** restores the global `_json` and `_json_pointer` literals. |
|
||||
| [v3.11.0](https://json.nlohmann.me/home/releases/v3.11.0/index.md) | 2022-08-01 | One of the largest releases ever. All changes are backward-compatible. **Highlights:** `std::string_view` keys; BJData binary format; C++20 support including `operator<=>`. |
|
||||
|
||||
## Version 3.10.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.10.5](https://json.nlohmann.me/home/releases/v3.10.5/index.md) | 2022-01-03 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.10.4](https://json.nlohmann.me/home/releases/v3.10.4/index.md) | 2021-10-16 | Fixes regressions introduced in 3.10.0. All changes are backward-compatible. |
|
||||
| [v3.10.3](https://json.nlohmann.me/home/releases/v3.10.3/index.md) | 2021-10-08 | Fixes more regressions from 3.10.0. All changes are backward-compatible. |
|
||||
| [v3.10.2](https://json.nlohmann.me/home/releases/v3.10.2/index.md) | 2021-08-26 | Re-release of 3.10.1, whose Git tag pointed at the wrong commit due to a bug in the release script. All changes are backward-compatible. |
|
||||
| [v3.10.1](https://json.nlohmann.me/home/releases/v3.10.1/index.md) | 2021-08-24 | Fixes a regression from 3.10.0. All changes are backward-compatible. |
|
||||
| [v3.10.0](https://json.nlohmann.me/home/releases/v3.10.0/index.md) | 2021-08-17 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.10.5](https://json.nlohmann.me/home/releases/v3.10.5/index.md) | 2022-01-03 | Bug-fix release. All changes are backward-compatible. **Highlights:** guards the `std::filesystem` conversions with `JSON_HAS_FILESYSTEM`. |
|
||||
| [v3.10.4](https://json.nlohmann.me/home/releases/v3.10.4/index.md) | 2021-10-16 | Fixes regressions introduced in 3.10.0. All changes are backward-compatible. **Highlights:** fixes the `std::filesystem::path` conversion; fixes types with explicit defaulted constructors; fixes `std::find`/`std::remove` return values. |
|
||||
| [v3.10.3](https://json.nlohmann.me/home/releases/v3.10.3/index.md) | 2021-10-08 | Fixes more regressions from 3.10.0. All changes are backward-compatible. **Highlights:** fixes extended-diagnostics assertions in `update` and array insertion; custom allocators for binary output; conversion from `begin()`/`end()`-only types. |
|
||||
| [v3.10.2](https://json.nlohmann.me/home/releases/v3.10.2/index.md) | 2021-08-26 | Re-release of 3.10.1, whose Git tag pointed at the wrong commit due to a bug in the release script. All changes are backward-compatible. **Highlights:** re-release of 3.10.1 with the correct Git tag. |
|
||||
| [v3.10.1](https://json.nlohmann.me/home/releases/v3.10.1/index.md) | 2021-08-24 | Fixes a regression from 3.10.0. All changes are backward-compatible. **Highlights:** fixes an extended-diagnostics assertion with `ordered_json`; hardens the GDB pretty-printer. |
|
||||
| [v3.10.0](https://json.nlohmann.me/home/releases/v3.10.0/index.md) | 2021-08-17 | Feature release. All changes are backward-compatible. **Highlights:** extended diagnostic messages (`JSON_DIAGNOSTICS`); GDB pretty-printer; CBOR tag storage. |
|
||||
|
||||
## Version 3.9.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------------------------------------------- |
|
||||
| [v3.9.1](https://json.nlohmann.me/home/releases/v3.9.1/index.md) | 2020-08-06 | Fixes two regressions from 3.9.0. All changes are backward-compatible. |
|
||||
| [v3.9.0](https://json.nlohmann.me/home/releases/v3.9.0/index.md) | 2020-07-27 | Feature release adding four long-requested features. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.9.1](https://json.nlohmann.me/home/releases/v3.9.1/index.md) | 2020-08-06 | Fixes two regressions from 3.9.0. All changes are backward-compatible. **Highlights:** accepts consecutive comments; completes the `ordered_json` interface. |
|
||||
| [v3.9.0](https://json.nlohmann.me/home/releases/v3.9.0/index.md) | 2020-07-27 | Feature release adding four long-requested features. All changes are backward-compatible. **Highlights:** comment parsing; `ordered_json`; switch to disable implicit conversions. |
|
||||
|
||||
## Version 3.8.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v3.8.0](https://json.nlohmann.me/home/releases/v3.8.0/index.md) | 2020-06-14 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.8.0](https://json.nlohmann.me/home/releases/v3.8.0/index.md) | 2020-06-14 | Feature release. All changes are backward-compatible. **Highlights:** binary value type for CBOR, BSON, and MessagePack; input adapters for any `LegacyInputIterator` container; fixes `contains` for JSON pointers. |
|
||||
|
||||
## Version 3.7.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.7.3](https://json.nlohmann.me/home/releases/v3.7.3/index.md) | 2019-11-17 | Fixes a regression from 3.7.2 that could yield quadratic complexity in destructor calls. All changes are backward-compatible. |
|
||||
| [v3.7.2](https://json.nlohmann.me/home/releases/v3.7.2/index.md) | 2019-11-10 | Fixes a stack overflow for deeply nested input by making the destructor iterative; parsing of JSON text is now bounded only by available memory (the binary-format parsers still recurse). All changes are backward-compatible. |
|
||||
| [v3.7.1](https://json.nlohmann.me/home/releases/v3.7.1/index.md) | 2019-11-06 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.7.0](https://json.nlohmann.me/home/releases/v3.7.0/index.md) | 2019-07-28 | Convenience features and house-keeping. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.7.3](https://json.nlohmann.me/home/releases/v3.7.3/index.md) | 2019-11-17 | Fixes a regression from 3.7.2 that could yield quadratic complexity in destructor calls. All changes are backward-compatible. **Highlights:** fixes quadratic complexity in destructor calls. |
|
||||
| [v3.7.2](https://json.nlohmann.me/home/releases/v3.7.2/index.md) | 2019-11-10 | Fixes a stack overflow for deeply nested input by making the destructor iterative; parsing of JSON text is now bounded only by available memory (the binary-format parsers still recurse). All changes are backward-compatible. **Highlights:** iterative destructor fixes a stack overflow on deeply nested input. |
|
||||
| [v3.7.1](https://json.nlohmann.me/home/releases/v3.7.1/index.md) | 2019-11-06 | Bug-fix release. All changes are backward-compatible. **Highlights:** fixes a crash when serializing the minimum `std::int64_t`; fixes `contains` for JSON pointers; `items` with custom string types. |
|
||||
| [v3.7.0](https://json.nlohmann.me/home/releases/v3.7.0/index.md) | 2019-07-28 | Convenience features and house-keeping. All changes are backward-compatible. **Highlights:** `contains` overload for JSON pointers; generic `to_string`; return value for `emplace_back`. |
|
||||
|
||||
## Version 3.6.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.6.1](https://json.nlohmann.me/home/releases/v3.6.1/index.md) | 2019-03-20 | Fixes a regression (GCC 7/8 compilation) and a `<Windows.h>` build error introduced in 3.6.0. All changes are backward-compatible. |
|
||||
| [v3.6.0](https://json.nlohmann.me/home/releases/v3.6.0/index.md) | 2019-03-20 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.6.1](https://json.nlohmann.me/home/releases/v3.6.1/index.md) | 2019-03-20 | Fixes a regression (GCC 7/8 compilation) and a `<Windows.h>` build error introduced in 3.6.0. All changes are backward-compatible. **Highlights:** fixes a GCC 7/8 compilation regression; fixes a `<Windows.h>` build error. |
|
||||
| [v3.6.0](https://json.nlohmann.me/home/releases/v3.6.0/index.md) | 2019-03-20 | Feature release. All changes are backward-compatible. **Highlights:** reworked JSON pointer interface; `contains` function; faster integer serialization. |
|
||||
|
||||
## Version 3.5.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v3.5.0](https://json.nlohmann.me/home/releases/v3.5.0/index.md) | 2018-12-22 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.5.0](https://json.nlohmann.me/home/releases/v3.5.0/index.md) | 2018-12-22 | Feature release. All changes are backward-compatible. **Highlights:** structured bindings via `items`; reading from `FILE*`; fixes `eofbit` handling on streams. |
|
||||
|
||||
## Version 3.4.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v3.4.0](https://json.nlohmann.me/home/releases/v3.4.0/index.md) | 2018-10-30 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
|
||||
| [v3.4.0](https://json.nlohmann.me/home/releases/v3.4.0/index.md) | 2018-10-30 | Feature release. All changes are backward-compatible. **Highlights:** BSON support; Unicode error handlers for `dump`; `NLOHMANN_JSON_SERIALIZE_ENUM`. |
|
||||
|
||||
## Version 3.3.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v3.3.0](https://json.nlohmann.me/home/releases/v3.3.0/index.md) | 2018-10-05 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ------------------------------------------------------------------------------------------------------------------------------ |
|
||||
| [v3.3.0](https://json.nlohmann.me/home/releases/v3.3.0/index.md) | 2018-10-05 | Feature release. All changes are backward-compatible. **Highlights:** GCC 4.8 support; `get_to`; overhauled CMake integration. |
|
||||
|
||||
## Version 3.2.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v3.2.0](https://json.nlohmann.me/home/releases/v3.2.0/index.md) | 2018-08-20 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.2.0](https://json.nlohmann.me/home/releases/v3.2.0/index.md) | 2018-08-20 | Feature release. All changes are backward-compatible. **Highlights:** SAX interface and non-recursive parser; parsing from wide strings; conversion to `std::string_view`. |
|
||||
|
||||
## Version 3.1.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v3.1.2](https://json.nlohmann.me/home/releases/v3.1.2/index.md) | 2018-03-14 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.1.1](https://json.nlohmann.me/home/releases/v3.1.1/index.md) | 2018-02-13 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v3.1.0](https://json.nlohmann.me/home/releases/v3.1.0/index.md) | 2018-02-01 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.1.2](https://json.nlohmann.me/home/releases/v3.1.2/index.md) | 2018-03-14 | Bug-fix release. All changes are backward-compatible. **Highlights:** fixes a memory leak in the parser callback; user-defined string types in parser and serializer. |
|
||||
| [v3.1.1](https://json.nlohmann.me/home/releases/v3.1.1/index.md) | 2018-02-13 | Bug-fix release. All changes are backward-compatible. **Highlights:** fixes parsing of indefinite-length CBOR strings; fixes a user-defined conversion to vector types; fixes UBJSON overflow detection. |
|
||||
| [v3.1.0](https://json.nlohmann.me/home/releases/v3.1.0/index.md) | 2018-02-01 | Feature release. All changes are backward-compatible. **Highlights:** UBJSON support; JSON Merge Patch; Grisu2 floating-point output. |
|
||||
|
||||
## Version 3.0.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v3.0.1](https://json.nlohmann.me/home/releases/v3.0.1/index.md) | 2017-12-29 | Fixes small issues in the [JSON Pointer](https://json.nlohmann.me/features/json_pointer/index.md) and [JSON Patch](https://json.nlohmann.me/features/json_patch/index.md) implementations (invalid "copy" targets and non-integer array indices). All changes are backward-compatible. |
|
||||
| [v3.0.0](https://json.nlohmann.me/home/releases/v3.0.0/index.md) | 2017-12-17 | First 3.x release — a major release with breaking changes (see the [migration guide](https://json.nlohmann.me/integration/migration_guide/index.md)). |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
|
||||
| [v3.0.1](https://json.nlohmann.me/home/releases/v3.0.1/index.md) | 2017-12-29 | Fixes small issues in the [JSON Pointer](https://json.nlohmann.me/features/json_pointer/index.md) and [JSON Patch](https://json.nlohmann.me/features/json_patch/index.md) implementations (invalid "copy" targets and non-integer array indices). All changes are backward-compatible. **Highlights:** fixes invalid JSON Patch "copy" targets; fixes non-integer array indices in JSON Pointer. |
|
||||
| [v3.0.0](https://json.nlohmann.me/home/releases/v3.0.0/index.md) | 2017-12-17 | First 3.x release — a major release with breaking changes (see the [migration guide](https://json.nlohmann.me/integration/migration_guide/index.md)). **Highlights:** user-defined exceptions with identifiers; non-throwing `accept` and `allow_exceptions`; `update` to merge objects. |
|
||||
|
||||
## Version 2.1.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------- |
|
||||
| [v2.1.1](https://json.nlohmann.me/home/releases/v2.1.1/index.md) | 2017-02-25 | Bug-fix release. All changes are backward-compatible. |
|
||||
| [v2.1.0](https://json.nlohmann.me/home/releases/v2.1.0/index.md) | 2017-01-28 | Feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v2.1.1](https://json.nlohmann.me/home/releases/v2.1.1/index.md) | 2017-02-25 | Bug-fix release. All changes are backward-compatible. **Highlights:** locale-independent number parsing and serialization; correct floating-point round-tripping; GPG-signed commits and files. |
|
||||
| [v2.1.0](https://json.nlohmann.me/home/releases/v2.1.0/index.md) | 2017-01-28 | Feature release. All changes are backward-compatible. **Highlights:** conversions from and to arbitrary user-defined types; `meta` function; `JSON_NOEXCEPTION`. |
|
||||
|
||||
## Version 2.0.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v2.0.10](https://json.nlohmann.me/home/releases/v2.0.10/index.md) | 2017-01-02 | Fixes several security-relevant bugs in the CBOR and MessagePack parsers found by OSS-Fuzz. All changes are backward-compatible. |
|
||||
| [v2.0.9](https://json.nlohmann.me/home/releases/v2.0.9/index.md) | 2016-12-16 | Adds the [CBOR](https://json.nlohmann.me/features/binary_formats/cbor/index.md) and [MessagePack](https://json.nlohmann.me/features/binary_formats/messagepack/index.md) binary formats. All changes are backward-compatible. |
|
||||
| [v2.0.8](https://json.nlohmann.me/home/releases/v2.0.8/index.md) | 2016-12-02 | Adds the [`emplace`](https://json.nlohmann.me/api/basic_json/emplace/index.md) and [`emplace_back`](https://json.nlohmann.me/api/basic_json/emplace_back/index.md) functions and improves parsing and serialization performance. All changes are backward-compatible. |
|
||||
| [v2.0.7](https://json.nlohmann.me/home/releases/v2.0.7/index.md) | 2016-11-02 | Fixes several parser bugs found through the "Parsing JSON is a Minefield" study (short files, encoding detection, surrogate pairs). All changes are backward-compatible. |
|
||||
| [v2.0.6](https://json.nlohmann.me/home/releases/v2.0.6/index.md) | 2016-10-15 | Fixes [`operator[]`](https://json.nlohmann.me/api/basic_json/operator%5B%5D/index.md) for [JSON pointers](https://json.nlohmann.me/features/json_pointer/index.md) so that it creates missing values like the other overloads. All changes are backward-compatible. |
|
||||
| [v2.0.5](https://json.nlohmann.me/home/releases/v2.0.5/index.md) | 2016-09-14 | Fixes a remaining stream end-of-file detection bug in the parser. All changes are backward-compatible. |
|
||||
| [v2.0.4](https://json.nlohmann.me/home/releases/v2.0.4/index.md) | 2016-09-11 | Fixes stream end-of-file detection in the parser. All changes are backward-compatible. |
|
||||
| [v2.0.3](https://json.nlohmann.me/home/releases/v2.0.3/index.md) | 2016-08-31 | Generalizes the parser to accept any contiguous sequence of one-byte elements and deprecates the input-stream constructor in favor of the [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md) function. All changes are backward-compatible. |
|
||||
| [v2.0.2](https://json.nlohmann.me/home/releases/v2.0.2/index.md) | 2016-07-31 | Overhauls the parser (now rejecting unescaped control characters), tightens the class invariants, and cleans up the code. All changes are backward-compatible. |
|
||||
| [v2.0.1](https://json.nlohmann.me/home/releases/v2.0.1/index.md) | 2016-06-28 | Fixes a performance regression in the [`dump`](https://json.nlohmann.me/api/basic_json/dump/index.md) function by adjusting the stream locale once per serialization. All changes are backward-compatible. |
|
||||
| [v2.0.0](https://json.nlohmann.me/home/releases/v2.0.0/index.md) | 2016-06-24 | Feature release with a minor (potentially non-backward-compatible) API change from added `noexcept` and `constexpr` specifiers. |
|
||||
| Release | Date | Summary |
|
||||
| ------------------------------------------------------------------ | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v2.0.10](https://json.nlohmann.me/home/releases/v2.0.10/index.md) | 2017-01-02 | Fixes several security-relevant bugs in the CBOR and MessagePack parsers found by OSS-Fuzz. All changes are backward-compatible. **Highlights:** fixes security-relevant bugs in the CBOR parser; fixes security-relevant bugs in the MessagePack parser. |
|
||||
| [v2.0.9](https://json.nlohmann.me/home/releases/v2.0.9/index.md) | 2016-12-16 | Adds the [CBOR](https://json.nlohmann.me/features/binary_formats/cbor/index.md) and [MessagePack](https://json.nlohmann.me/features/binary_formats/messagepack/index.md) binary formats. All changes are backward-compatible. **Highlights:** CBOR support; MessagePack support. |
|
||||
| [v2.0.8](https://json.nlohmann.me/home/releases/v2.0.8/index.md) | 2016-12-02 | Adds the [`emplace`](https://json.nlohmann.me/api/basic_json/emplace/index.md) and [`emplace_back`](https://json.nlohmann.me/api/basic_json/emplace_back/index.md) functions and improves parsing and serialization performance. All changes are backward-compatible. **Highlights:** `emplace` and `emplace_back`; faster parsing; faster serialization. |
|
||||
| [v2.0.7](https://json.nlohmann.me/home/releases/v2.0.7/index.md) | 2016-11-02 | Fixes several parser bugs found through the "Parsing JSON is a Minefield" study (short files, encoding detection, surrogate pairs). All changes are backward-compatible. **Highlights:** fixes short-file handling; fixes encoding detection; fixes surrogate pairs. |
|
||||
| [v2.0.6](https://json.nlohmann.me/home/releases/v2.0.6/index.md) | 2016-10-15 | Fixes [`operator[]`](https://json.nlohmann.me/api/basic_json/operator%5B%5D/index.md) for [JSON pointers](https://json.nlohmann.me/features/json_pointer/index.md) so that it creates missing values like the other overloads. All changes are backward-compatible. **Highlights:** `operator[]` creates missing values for JSON pointers. |
|
||||
| [v2.0.5](https://json.nlohmann.me/home/releases/v2.0.5/index.md) | 2016-09-14 | Fixes a remaining stream end-of-file detection bug in the parser. All changes are backward-compatible. **Highlights:** fixes a remaining stream end-of-file bug. |
|
||||
| [v2.0.4](https://json.nlohmann.me/home/releases/v2.0.4/index.md) | 2016-09-11 | Fixes stream end-of-file detection in the parser. All changes are backward-compatible. **Highlights:** fixes stream end-of-file detection. |
|
||||
| [v2.0.3](https://json.nlohmann.me/home/releases/v2.0.3/index.md) | 2016-08-31 | Generalizes the parser to accept any contiguous sequence of one-byte elements and deprecates the input-stream constructor in favor of the [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md) function. All changes are backward-compatible. **Highlights:** parser accepts any contiguous sequence of one-byte elements; deprecates the input-stream constructor in favor of `parse`. |
|
||||
| [v2.0.2](https://json.nlohmann.me/home/releases/v2.0.2/index.md) | 2016-07-31 | Overhauls the parser (now rejecting unescaped control characters), tightens the class invariants, and cleans up the code. All changes are backward-compatible. **Highlights:** overhauled parser rejecting unescaped control characters; tighter class invariants; code cleanup. |
|
||||
| [v2.0.1](https://json.nlohmann.me/home/releases/v2.0.1/index.md) | 2016-06-28 | Fixes a performance regression in the [`dump`](https://json.nlohmann.me/api/basic_json/dump/index.md) function by adjusting the stream locale once per serialization. All changes are backward-compatible. **Highlights:** fixes a performance regression in `dump`. |
|
||||
| [v2.0.0](https://json.nlohmann.me/home/releases/v2.0.0/index.md) | 2016-06-24 | Feature release with a minor (potentially non-backward-compatible) API change from added `noexcept` and `constexpr` specifiers. **Highlights:** JSON Pointer support in `at` and `operator[]`, plus `flatten` and `unflatten`; JSON Patch via `diff` and `patch`; unsigned 64-bit integers. |
|
||||
|
||||
## Version 1.1.x
|
||||
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | ----------------------------------------------------------------- |
|
||||
| [v1.1.0](https://json.nlohmann.me/home/releases/v1.1.0/index.md) | 2016-01-24 | Bug-fix and feature release. All changes are backward-compatible. |
|
||||
| Release | Date | Summary |
|
||||
| ---------------------------------------------------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
|
||||
| [v1.1.0](https://json.nlohmann.me/home/releases/v1.1.0/index.md) | 2016-01-24 | Bug-fix and feature release. All changes are backward-compatible. **Highlights:** improved floating-point round-tripping; `get_ref`; runtime assertions. |
|
||||
|
||||
## Version 1.0.x
|
||||
|
||||
@@ -146,3 +150,4 @@ Every release has its own page with a summary of its notable changes and an over
|
||||
## See also
|
||||
|
||||
- [Migration Guide](https://json.nlohmann.me/integration/migration_guide/index.md) — how to future-proof your code for the next major version and replace deprecated functions.
|
||||
- [Roadmap: Version 4.0](https://json.nlohmann.me/community/roadmap/#version-40) — what the next major version will change and how to try it today.
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/unreleased/" rel="canonical"><link href=../ rel=prev><link href=../v3.12.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Unreleased - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div classLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/unreleased/" rel="canonical"><link href=../ rel=prev><link href=../v3.12.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Unreleased - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../../css/custom.css><link rel=stylesheet href=../../../css/brand.css><link rel=stylesheet href=../../../css/fig-sax.css><link rel=stylesheet href=../../../css/fig-jsonview.css><link rel=stylesheet 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data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Unreleased </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default 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12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.5Line truncated
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||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v1.0.0/" rel="canonical"><link href=../v1.1.0/ rel=prev><link href=../../design_goals/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v1.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.1/" rel="canonical"><link href=../v2.0.2/ rel=prev><link href=../v2.0.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.2/" rel="canonical"><link href=../v2.0.3/ rel=prev><link href=../v2.0.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.4/" rel="canonical"><link href=../v2.0.5/ rel=prev><link href=../v2.0.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.4 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.6/" rel="canonical"><link href=../v2.0.7/ rel=prev><link href=../v2.0.5/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.6 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.1.0/" rel="canonical"><link href=../v2.1.1/ rel=prev><link href=../v2.0.10/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.0.0/" rel="canonical"><link href=../v3.0.1/ rel=prev><link href=../v2.1.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.0/" rel="canonical"><link href=../v3.1.1/ rel=prev><link href=../v3.0.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.2/" rel="canonical"><link href=../v3.2.0/ rel=prev><link href=../v3.1.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.1/" rel="canonical"><link href=../v3.10.2/ rel=prev><link href=../v3.10.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.3/" rel="canonical"><link href=../v3.10.4/ rel=prev><link href=../v3.10.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.3/" rel="canonical"><link href=../v3.10.4/ rel=prev><link href=../v3.10.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../../css/custom.css><link rel=stylesheet href=../../../css/brand.css><link rel=stylesheet href=../../../css/fig-sax.css><link rel=stylesheet href=../../../css/fig-jsonview.css><link rel=stylesheet 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.1/" rel="canonical"><link href=../v3.11.2/ rel=prev><link href=../v3.11.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.3/" rel="canonical"><link href=../v3.12.0/ rel=prev><link href=../v3.11.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.3/" rel="canonical"><link href=../v3.12.0/ rel=prev><link href=../v3.11.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../../css/custom.css><link rel=stylesheet href=../../../css/brand.css><link rel=stylesheet href=../../../css/fig-sax.css><link rel=stylesheet href=../../../css/fig-jsonview.css><link rel=stylesheet 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.7.0/" rel="canonical"><link href=../v3.7.1/ rel=prev><link href=../v3.6.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.7.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.7.2/" rel="canonical"><link href=../v3.7.3/ rel=prev><link href=../v3.7.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.7.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.9.0/" rel="canonical"><link href=../v3.9.1/ rel=prev><link href=../v3.8.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.9.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../../css/custom.css><link rel=stylesheet href=../../../css/brand.css><link rel=stylesheet href=../../../css/fig-sax.css><link rel=stylesheet href=../../../css/fig-jsonview.css><link rel=stylesheet 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@@ -1 +1 @@
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.9.1/" rel="canonical"><link href=../v3.10.0/ rel=prev><link href=../v3.9.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.9.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.9.1/" rel="canonical"><link href=../v3.10.0/ rel=prev><link href=../v3.9.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.9.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../../css/custom.css><link rel=stylesheet href=../../../css/brand.css><link rel=stylesheet href=../../../css/fig-sax.css><link rel=stylesheet href=../../../css/fig-jsonview.css><link rel=stylesheet 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+20
-7
@@ -1,18 +1,31 @@
|
||||
# Sponsors
|
||||
|
||||
You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nlohmann).
|
||||
You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nlohmann). Thanks to everyone who
|
||||
supports the project!
|
||||
|
||||
## Priority Sponsor
|
||||
## Priority Sponsors
|
||||
|
||||
- [Martti Laine](https://github.com/codeclown)
|
||||
- [Paul Harrington](https://github.com/phrrngtn)
|
||||
- [Mercedes-Benz](https://github.com/mercedes-benz)
|
||||
- [FastNetMon](https://github.com/FastNetMon)
|
||||
|
||||
## Named Sponsors
|
||||
|
||||
- [Paul Harrington](https://github.com/phrrngtn)
|
||||
- [Steve Wagner](https://github.com/ciroque)
|
||||
- [mccaffers](https://github.com/mccaffers)
|
||||
- [jambolo](https://github.com/jambolo)
|
||||
|
||||
## Further Sponsors
|
||||
|
||||
- [Grisha Kirilin](https://github.com/GrishaKirilin)
|
||||
- [zimmerman-dev](https://github.com/zimmerman-dev)
|
||||
- [WAAutoMaton](https://github.com/WAAutoMaton)
|
||||
- [F3D](https://github.com/f3d-app)
|
||||
- [David Alvarez Rosa](https://github.com/david-alvarez-rosa)
|
||||
- [Alex Kong](https://github.com/alex-lt-kong)
|
||||
- [Mark Oates](https://github.com/MarkOates)
|
||||
- [Martti Laine](https://github.com/codeclown)
|
||||
- Michael Hartmann
|
||||
- [Stefan Hagen](https://github.com/sthagen)
|
||||
- [Steve Sperandeo](https://github.com/homer6)
|
||||
- [Robert Jefe Lindstädt](https://github.com/eljefedelrodeodeljefe)
|
||||
- [Steve Wagner](https://github.com/ciroque)
|
||||
|
||||
Thanks everyone!
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/sponsors/" rel="canonical"><link href=../customers/ rel=prev><link href=../debugging/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Sponsors - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Sponsors </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-componeLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/sponsors/" rel="canonical"><link href=../customers/ rel=prev><link href=../debugging/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Sponsors - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#sponsors class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=../../images/wordmark-header.svg alt=logo> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Sponsors </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=custom data-md-color-accent=custom aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-Line truncated
|
||||
+19
-7
@@ -1,18 +1,30 @@
|
||||
# Sponsors
|
||||
|
||||
You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nlohmann).
|
||||
You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nlohmann). Thanks to everyone who supports the project!
|
||||
|
||||
## Priority Sponsor
|
||||
## Priority Sponsors
|
||||
|
||||
- [Martti Laine](https://github.com/codeclown)
|
||||
- [Paul Harrington](https://github.com/phrrngtn)
|
||||
- [Mercedes-Benz](https://github.com/mercedes-benz)
|
||||
- [FastNetMon](https://github.com/FastNetMon)
|
||||
|
||||
## Named Sponsors
|
||||
|
||||
- [Paul Harrington](https://github.com/phrrngtn)
|
||||
- [Steve Wagner](https://github.com/ciroque)
|
||||
- [mccaffers](https://github.com/mccaffers)
|
||||
- [jambolo](https://github.com/jambolo)
|
||||
|
||||
## Further Sponsors
|
||||
|
||||
- [Grisha Kirilin](https://github.com/GrishaKirilin)
|
||||
- [zimmerman-dev](https://github.com/zimmerman-dev)
|
||||
- [WAAutoMaton](https://github.com/WAAutoMaton)
|
||||
- [F3D](https://github.com/f3d-app)
|
||||
- [David Alvarez Rosa](https://github.com/david-alvarez-rosa)
|
||||
- [Alex Kong](https://github.com/alex-lt-kong)
|
||||
- [Mark Oates](https://github.com/MarkOates)
|
||||
- [Martti Laine](https://github.com/codeclown)
|
||||
- Michael Hartmann
|
||||
- [Stefan Hagen](https://github.com/sthagen)
|
||||
- [Steve Sperandeo](https://github.com/homer6)
|
||||
- [Robert Jefe Lindstädt](https://github.com/eljefedelrodeodeljefe)
|
||||
- [Steve Wagner](https://github.com/ciroque)
|
||||
|
||||
Thanks everyone!
|
||||
Reference in new issue
Block a user