Merge remote-tracking branch 'origin/develop' into HEAD

This commit is contained in:
Niels Lohmann
2026-09-14 21:26:29 +02:00
125 changed files with 13540 additions and 4413 deletions
+1 -1
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@@ -49,7 +49,7 @@ Unlike the [`parse()`](parse.md) function, this function neither throws an excep
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::counted_iterator` with a different sentinel type
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
+2 -3
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@@ -13,9 +13,8 @@ is compatible with both of the binary data formats that use binary subtyping, (t
incompatible with each other, and it is up to the user to translate between them). The subtype is added to `BinaryType`
via the helper type [byte_container_with_subtype](../byte_container_with_subtype/index.md).
[CBOR's RFC 7049](https://tools.ietf.org/html/rfc7049) describes this type as:
> Major type 2: a byte string. The string's length in bytes is represented following the rules for positive integers
> (major type 0).
[CBOR's RFC 8949](https://www.rfc-editor.org/rfc/rfc8949.html#section-3.1) describes this type as:
> Major type 2: A byte string. The number of bytes in the string is equal to the argument.
[MessagePack's documentation on the bin type
family](https://github.com/msgpack/msgpack/blob/master/spec.md#bin-format-family) describes this type as:
+11
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@@ -43,6 +43,17 @@ Strong guarantee: if an exception is thrown, there are no changes to any JSON va
Throws [`type_error.316`](../../home/exceptions.md#jsonexceptiontype_error316) if a string stored inside the JSON value
is not UTF-8 encoded and `error_handler` is set to `strict`
!!! warning "Serializing untrusted input"
When serializing values that may contain invalid or untrusted UTF-8 (e.g., bytes taken directly from network
input), `dump()` throws [`type_error.316`](../../home/exceptions.md#jsonexceptiontype_error316) in the default
`strict` mode. To serialize such data without throwing, pass
[`error_handler_t::replace`](error_handler_t.md) (substitutes U+FFFD) or
[`error_handler_t::ignore`](error_handler_t.md). Callers that serialize untrusted input on a crash-sensitive path
should either choose a non-strict error handler or wrap `dump()` in a `#!cpp try`/`#!cpp catch`.
See the [FAQ](../../home/faq.md#serializing-untrusted-or-invalid-utf-8) for details.
## Complexity
Linear.
@@ -36,8 +36,10 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: a compatible iterator type
`SentinelType`
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance a
custom sentinel type for C++20 ranges
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
+4 -2
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@@ -36,8 +36,10 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: a compatible iterator type
`SentinelType`
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance a
custom sentinel type for C++20 ranges
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
+4 -2
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@@ -39,8 +39,10 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: a compatible iterator type
`SentinelType`
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance a
custom sentinel type for C++20 ranges
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
@@ -36,8 +36,10 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: a compatible iterator type
`SentinelType`
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance a
custom sentinel type for C++20 ranges
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
@@ -36,8 +36,10 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: a compatible iterator type
`SentinelType`
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance a
custom sentinel type for C++20 ranges
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
+1 -1
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@@ -48,7 +48,7 @@ static basic_json parse(IteratorType first, SentinelType last,
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
- a custom sentinel type for C++20 ranges
- `std::counted_iterator` with a different sentinel type
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
## Parameters
@@ -29,7 +29,14 @@ Discarding a value (i.e., returning `#!cpp false`) has different effects dependi
called:
- Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never
read.
read. This holds for every value type and for both kinds of parent: a discarded element is removed from the
surrounding array, and a discarded member is removed from the surrounding object together with its key.
- Arrays and objects can be discarded either at their `parse_event_t::array_start`/`parse_event_t::object_start` event
or at their `parse_event_t::array_end`/`parse_event_t::object_end` event, and both remove the whole value. Discarding
it at the start event also means the callback is called neither for the content of the value nor for its matching end
event.
- Discarding a `parse_event_t::key` event discards the whole object member. The callback is still called for the
associated value, but its return value has no further effect.
- In case a value outside a structured type is skipped, it is replaced with `null`. This case happens if the top-level
element is skipped.
@@ -49,7 +56,7 @@ called:
## Return value
Whether the JSON value which called the function during parsing should be kept (`#!cpp true`) or not (`#!cpp false`). In
the latter case, it is either skipped completely or replaced by an empty discarded object.
the latter case, it is skipped completely, or replaced by `null` if it is the top-level value.
## Examples
@@ -68,6 +75,21 @@ the latter case, it is either skipped completely or replaced by an empty discard
--8<-- "examples/parse__string__parser_callback_t.output"
```
??? example
The example below shows where discarded values are removed. The array and the number are discarded in different
ways, but in each case the parse result contains neither the value nor its key.
```cpp
--8<-- "examples/parser_callback_t.cpp"
```
Output:
```json
--8<-- "examples/parser_callback_t.output"
```
## See also
- [parse](parse.md) deserialize from a compatible input
@@ -76,3 +98,5 @@ the latter case, it is either skipped completely or replaced by an empty discard
## Version history
- Added in version 1.0.0.
- Fixed in version 3.13.0 to also remove discarded values from a parent object; before, discarding an array or a value
stored under an object key left a discarded member behind, which made the parse result serialize to invalid JSON.
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@@ -34,6 +34,10 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
("add", "remove", "move")
- Throws [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) if an "add" operation's target
location has a parent that is neither an object nor an array.
- Throws [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) if a "remove" operation's target
location has a parent that is neither an object nor an array.
- Throws [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) if a "move" operation's "from"
location is a proper prefix of its "path" location.
- Throws [`other_error.501`](../../home/exceptions.md#jsonexceptionother_error501) if "test" operation was
unsuccessful.
@@ -75,3 +79,7 @@ is thrown. In any case, the original value is not changed: the patch is applied
- Added in version 2.0.0.
- Added [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's
target location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target
location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper
prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0.
@@ -30,6 +30,10 @@ No guarantees, value may be corrupted by an unsuccessful patch operation.
("add", "remove", "move")
- Throws [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) if an "add" operation's target
location has a parent that is neither an object nor an array.
- Throws [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) if a "remove" operation's target
location has a parent that is neither an object nor an array.
- Throws [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) if a "move" operation's "from"
location is a proper prefix of its "path" location.
- Throws [`other_error.501`](../../home/exceptions.md#jsonexceptionother_error501) if "test" operation was
unsuccessful.
@@ -72,3 +76,7 @@ function throws an exception.
- Added in version 3.11.0.
- Added [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's
target location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target
location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper
prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0.
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@@ -48,7 +48,10 @@ The SAX event lister must follow the interface of [`json_sax`](../json_sax/index
with a size of 1, 2, or 4 bytes (interpreted respectively as UTF-8, UTF-16, and UTF-32)
`SentinelType`
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for overload (2)
: defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for overload (2), for instance.
- a custom sentinel type for C++20 ranges
- `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
`SAX`
: a class fulfilling the SAX event listener interface; see [`json_sax`](../json_sax/index.md)
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@@ -34,10 +34,14 @@ void swap(typename binary_t::container_type& other);
```
1. Exchanges the contents of the JSON value with those of `other`. Does not invoke any move, copy, or swap operations on
individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. If macro
[`JSON_DIAGNOSTIC_POSITIONS`](../macros/json_diagnostic_positions.md) is defined to `#!cpp 1`, the
[`start_pos()`](start_pos.md)/[`end_pos()`](end_pos.md) diagnostic positions are exchanged along with the value.
2. Exchanges the contents of the JSON value from `left` with those of `right`. Does not invoke any move, copy, or swap
operations on individual elements. All iterators and references remain valid. The past-the-end iterator is
invalidated. Implemented as a friend function callable via ADL.
invalidated. Implemented as a friend function callable via ADL. If macro
[`JSON_DIAGNOSTIC_POSITIONS`](../macros/json_diagnostic_positions.md) is defined to `#!cpp 1`, the
[`start_pos()`](start_pos.md)/[`end_pos()`](end_pos.md) diagnostic positions are exchanged along with the value.
3. Exchanges the contents of a JSON array with those of `other`. Does not invoke any move, copy, or swap operations on
individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
4. Exchanges the contents of a JSON object with those of `other`. Does not invoke any move, copy, or swap operations on
@@ -52,6 +52,11 @@ optional, `#!cpp bjdata_version_t::draft2` by default.
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
## Exceptions
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
is false.
## Complexity
Linear in the size of the JSON value `j`.
+6 -1
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@@ -40,10 +40,15 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
is not an object; example: `"to serialize to BSON, top-level type must be object, but is string"`
- Throws [`out_of_range.409`](../../home/exceptions.md#jsonexceptionout_of_range409) if a key in the JSON object contains
a null byte (code point U+0000); example: `"BSON key cannot contain code point U+0000 (at byte 2)"`
- Throws [`out_of_range.412`](../../home/exceptions.md#jsonexceptionout_of_range412) if the length of a document, array,
string, or binary value exceeds the range of the 32-bit BSON length field; example:
`"BSON length 2147483661 exceeds maximum of 2147483647"`
## Complexity
Linear in the size of the JSON value `j`.
Proportional to the size of the JSON value `j` multiplied by its maximum nesting
depth, `O(n × d)`. BSON length prefixes are computed recursively before nested
values are written.
## Examples
@@ -45,6 +45,11 @@ The exact mapping and its limitations are described on a [dedicated page](../../
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
## Exceptions
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
is false.
## Complexity
Linear in the size of the JSON value `j`.
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@@ -24,6 +24,7 @@ header. See also the [macro overview page](../../features/macros.md).
- [**JSON_NO_IO**](json_no_io.md) - switch off functions relying on certain C++ I/O headers
- [**JSON_SKIP_UNSUPPORTED_COMPILER_CHECK**](json_skip_unsupported_compiler_check.md) - do not warn about unsupported compilers
- [**JSON_USE_GLOBAL_UDLS**](json_use_global_udls.md) - place user-defined string literals (UDLs) into the global namespace
- [**JSON_USE_SIMDUTF**](json_use_simdutf.md) - use the simdutf library to accelerate UTF-8 validation
## Library version
@@ -38,7 +38,8 @@ When the macro is not defined, the library will define it to its default value.
Diagnostic messages can also be controlled with the CMake option
[`JSON_Diagnostics`](../../integration/cmake.md#json_diagnostics) (`OFF` by default)
which defines `JSON_DIAGNOSTICS` accordingly.
which defines `JSON_DIAGNOSTICS` accordingly. Note this only applies when building the
library from source — see the pre-installed-package caveat on that page.
## Examples
@@ -0,0 +1,71 @@
# JSON_USE_SIMDUTF
```cpp
#define JSON_USE_SIMDUTF
```
When defined, the parser validates the UTF-8 content of JSON strings that come from a **contiguous byte input**
(`std::string`, `std::vector<char>`/`<std::uint8_t>`, string literals, `const char*` ranges, …) using the
[simdutf](https://github.com/simdutf/simdutf) library instead of the built-in scalar validator. On text with many
non-ASCII characters (e.g. CJK or emoji) this can validate several times faster.
This is an **opt-in external dependency**. The library itself remains header-only and its behavior is unchanged: the
same input is accepted or rejected either way, and every parse error is reported at the same position with the same
message (simdutf is only used to fast-path *valid* runs; anything it flags falls back to the scalar path so the exact
diagnostic is preserved). Streaming inputs (files, `std::istream`, wide strings, user-defined adapters) always use the
scalar path.
When `JSON_USE_SIMDUTF` is defined you must make the `simdutf.h` header available on the include path and link the
simdutf library. When it is not defined, no simdutf header is included and there is no dependency.
!!! note "Requires C++17"
simdutf requires C++17 and its header rejects older standards with an `#!cpp #error`. The backend is therefore only
compiled in from C++17 on. In C++11 and C++14 the macro has no effect and the scalar validator is used, which
accepts and rejects exactly the same input -- only throughput differs. Setting the macro project-wide is therefore
safe even when some translation units are built with an older standard.
!!! warning "Define consistently"
The macro selects between two definitions of the same inline validation function. It must therefore be defined
identically for **every** translation unit that includes the library; mixing translation units that define it with
ones that do not is an ODR violation. Prefer setting it as a compile definition on the target rather than with
`#!cpp #define` in individual source files.
## Default definition
By default, `#!cpp JSON_USE_SIMDUTF` is not defined and the portable C++11 scalar validator is used.
```cpp
#undef JSON_USE_SIMDUTF
```
## Examples
??? example
The code below enables the simdutf backend for UTF-8 validation.
```cpp
#define JSON_USE_SIMDUTF 1
#include <nlohmann/json.hpp>
...
```
The project must also link against simdutf, e.g. with CMake:
```cmake
target_compile_definitions(your_target PRIVATE JSON_USE_SIMDUTF)
target_link_libraries(your_target PRIVATE simdutf::simdutf)
```
!!! hint "Testing this configuration"
The unit tests can be built against the simdutf backend with the CMake option `JSON_TestSimdutf` (`OFF` by
default), which fetches simdutf and defines `JSON_USE_SIMDUTF` for every test target. The `ci_test_simdutf` target
runs the whole test suite in that configuration.
## Version history
- Added in version 3.13.0.
+32 -5
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@@ -33,17 +33,44 @@ A UTF-8 byte order mark is silently ignored.
Invalid Unicode escapes and unpaired surrogates in the input are reported as
[`parse_error.101`](../home/exceptions.md#jsonexceptionparse_error101) with a detailed message.
`operator>>` parses exactly one JSON value and leaves the stream positioned right after it, so it can be called
repeatedly to read a sequence of concatenated JSON values from the same stream:
`operator>>` parses exactly one JSON value, so it can be called repeatedly to read a sequence of concatenated JSON
values from the same stream:
```cpp
json j1, j2;
input >> j1; // parses the first value, stream now positioned right after it
input >> j1; // parses the first value
input >> j2; // parses the next value
```
Note this does **not** work for [JSON Lines](../features/parsing/json_lines.md) (newline-delimited JSON) input --
see that page for why and for the recommended alternative.
!!! warning "A number must be followed by whitespace"
A number is only terminated by the character that follows it. That character is read from the stream to detect the
end of the number, and it is **not** put back. When a value that is a number is immediately followed by the next
value, the first character of that next value is lost:
```cpp
std::istringstream input("1true");
json j1, j2;
input >> j1; // j1 == 1
input >> j2; // throws parse_error.101: the stream now starts at "rue"
```
Separating the values with whitespace avoids this, because the character that is eaten is then the separator:
```cpp
std::istringstream input("1 true");
json j1, j2;
input >> j1; // j1 == 1
input >> j2; // j2 == true
```
Only numbers are affected. Values ending in a self-delimiting character do not read past themselves, so
`truefalse`, `[1][2]`, `{"a":1}{"b":2}`, and `"a""b"` can be read back to back without a separator.
This is tracked in [#5340](https://github.com/nlohmann/json/issues/5340).
Note that reading concatenated values does **not** work for [JSON Lines](../features/parsing/json_lines.md)
(newline-delimited JSON) input -- see that page for why and for the recommended alternative.
!!! warning "Deprecation"
+6
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@@ -13,6 +13,12 @@ Therefore, adding object elements can yield a reallocation in which case all ite
[`end()`](basic_json/end.md) iterator) and all references to the elements are invalidated. Also, any iterator or
reference after the insertion point will point to the same index, which is now a different value.
## Complexity
[`ordered_map`](ordered_map.md) has no lookup index: every key-based object operation is a linear scan, so building or
parsing an object of `n` keys costs O(n²) rather than O(n log n). See
[`ordered_map` complexity](ordered_map.md#complexity) for the per-operation table and for measured numbers.
## Examples
??? example
+42
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@@ -57,6 +57,48 @@ std::equal_to<> // since C++14
- [**find**](find.md)
- [**insert**](insert.md)
## Complexity
Because the elements are stored in a `std::vector` in insertion order, there is no index to look a key up by. Every
key-based operation performs a **linear scan** over the stored elements. With `n` denoting the number of elements in the
container:
| Operation | Complexity | Note |
|----------------------------------------|----------------|----------------------------------------------------------|
| **emplace** | O(n) | scans for an existing key, then appends (amortized O(1)) |
| **operator\[\]** | O(n) | delegates to **emplace** (non-const) or **at** (const) |
| **at** | O(n) | throws `#!cpp std::out_of_range` if the key is not found |
| **find** | O(n) | |
| **count** | O(n) | the result is always 0 or 1 |
| **erase(key)** | O(n) | scan, then move the remaining elements one position down |
| **erase(pos)**, **erase(first, last)** | O(n) | moves all elements after the erased range |
| **insert(value)** | O(n) | equivalent to **emplace** |
| **insert(first, last)** | O((n + m) * m) | for `m` inserted elements |
This differs from `#!cpp std::map`, where the same operations are O(log n).
!!! warning "Quadratic cost of building large objects"
Because every insertion scans all elements inserted so far, building an object of `n` distinct keys costs
**O(n²)** in total. This applies to filling an [`ordered_json`](ordered_json.md) object key by key as well as to
parsing one, since the parser inserts each key as it is read.
The cost is negligible for the object sizes typically found in configuration files or API payloads, but it grows
steeply for machine-generated objects with many thousands of keys. Measured with `-O2 -DNDEBUG` for parsing a flat
object of `n` keys, relative to `#!cpp nlohmann::json` (which uses `#!cpp std::map`):
| `n` | `json` | `ordered_json` | factor |
|--------|--------|----------------|--------|
| 2000 | 0.7 ms | 3.6 ms | 5× |
| 4000 | 0.8 ms | 14.0 ms | 19× |
| 8000 | 1.6 ms | 67.8 ms | 43× |
| 16 000 | 3.3 ms | 181.6 ms | 54× |
If key order matters for objects of that size, consider a container with a lookup index, such as
[`tsl::ordered_map`](https://github.com/Tessil/ordered-map)
([integration](https://github.com/nlohmann/json/issues/546#issuecomment-304447518)), as the object type -- see
[object order](../features/object_order.md).
## Examples
??? example
+40
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@@ -0,0 +1,40 @@
# Ecosystem
The projects below build on top of `nlohmann::json` rather than merely using it - schema validators, language
bindings, format converters, and similar building blocks. The list is not exhaustive, and is curated rather than
automatically generated. If you maintain or know of a project that belongs here,
[please let me know](mailto:mail@nlohmann.me).
For products, applications, and organizations that use the library, see [Customers](../home/customers.md) instead.
## Schema validation
- [**json-schema-validator**](https://github.com/pboettch/json-schema-validator), a JSON Schema (draft 7) validator
with human-readable error messages
## Serialization and reflection
- [**nlohmann_json_reflect**](https://github.com/1261385937/nlohmann_json_reflect), a reflection extension for
(de)serializing nested containers-in-structs-in-containers
## Encodings
- [**base-encode-decode**](https://github.com/saxonnicholls/base-encode-decode), a header-only Base64/32/16/8/4/2
(and DNA/RNA) encoding library, with an adapter that serializes binary data through `nlohmann::json`
## Language bindings and interop
- [**pybind11_json**](https://github.com/pybind/pybind11_json), a bidirectional type caster between
`nlohmann::json` and Python objects for [pybind11](https://github.com/pybind/pybind11) bindings
- [**nanobind_json**](https://github.com/ianhbell/nanobind_json), the same idea for
[nanobind](https://github.com/wjakob/nanobind) bindings
- [**nlohmann_json_qt**](https://github.com/dpurgin/nlohmann_json_qt), deserialization helpers for Qt types
(`QString`, `QUrl`, `QDateTime`, `QVector`, ...) from `nlohmann::json`
- [**vulkan2json**](https://github.com/Fadis/vulkan2json), serialization and deserialization of Vulkan API structs
## Format converters
- [**tojson**](https://github.com/mircodz/tojson), a header-only converter between YAML/XML documents and
`nlohmann::json`
- [**json2xml**](https://github.com/testillano/json2xml), a header-only converter from `nlohmann::json` to XML for
simple configuration documents
+1
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@@ -1,5 +1,6 @@
# Community
- [Ecosystem](ecosystem.md) - third-party projects built on top of this library
- [Code of Conduct](code_of_conduct.md) - the rules and norms of this project
- [Contribution Guidelines](contribution_guidelines.md) - guidelines how to contribute to this project
- [Governance](governance.md) - the governance model of this project
@@ -66,6 +66,7 @@ Note: Some modern features (like C++20 ranges or filesystem support) may be disa
| Clang 20.1.1 | x86_64 | Ubuntu 22.04.1 LTS | GitHub |
| Clang 20.1.8 with GNU-like command-line | x86_64 | Windows Server 2022 (Build 20348) | GitHub |
| Clang 21.1.8 | x86_64 | Ubuntu 22.04.1 LTS | GitHub |
| Clang 22.1.8 | x86_64 | Ubuntu 22.04.1 LTS | GitHub |
| CUDA 11.8.0 (nvcc) | x86_64 | Ubuntu 22.04 LTS | GitHub |
| CUDA 12.1.1 (nvcc) | x86_64 | Ubuntu 22.04 LTS | GitHub |
| CUDA 12.6.3 (nvcc) | x86_64 | Ubuntu 22.04 LTS | GitHub |
@@ -4,8 +4,8 @@
Hello, world!
1 2 3 4 5
string: "Hello, world!"
number: {"floating-point":17.23,"integer":42}
null: null
string: "Hello, world!"
boolean: true
array: [1,2,3,4,5]
+1 -1
View File
@@ -4,8 +4,8 @@
Hello, world!
1 2 3 4 5
string: "Hello, world!"
number: {"floating-point":17.23,"integer":42}
null: null
string: "Hello, world!"
boolean: true
array: [1,2,3,4,5]
@@ -4,9 +4,9 @@
Hello, world!
1 2 3 4 5
string: "Hello, world!"
number: {"floating-point":17.23,"integer":42}
null: null
string: "Hello, world!"
boolean: true
array: [1,2,3,4,5]
[json.exception.type_error.302] type must be boolean, but is string
@@ -0,0 +1,47 @@
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// a JSON text with an array and a number inside an object
auto text = R"({"IDs": [116, 943], "Width": 800})";
// discard the array when the parser reads its opening bracket
json j_array_start = json::parse(text, [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
{
return event != json::parse_event_t::array_start;
});
// discard the same array when the parser reads its closing bracket
json j_array_end = json::parse(text, [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
{
return event != json::parse_event_t::array_end;
});
// discard the number, but keep its key
json j_value = json::parse(text, [](int /*depth*/, json::parse_event_t event, json & parsed)
{
return !(event == json::parse_event_t::value && parsed == json(800));
});
// discard the key of the number
json j_key = json::parse(text, [](int /*depth*/, json::parse_event_t event, json & parsed)
{
return !(event == json::parse_event_t::key && parsed == json("Width"));
});
// discard the top-level object
json j_root = json::parse(text, [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
{
return event != json::parse_event_t::object_end;
});
// in every case, the discarded value is removed together with its key
std::cout << j_array_start << '\n'
<< j_array_end << '\n'
<< j_value << '\n'
<< j_key << '\n'
<< j_root << '\n';
}
@@ -0,0 +1,5 @@
{"Width":800}
{"Width":800}
{"IDs":[116,943]}
{"IDs":[116,943]}
null
@@ -116,9 +116,20 @@ The library uses the following mapping from JSON values types to BJData types ac
```
Likewise, when a JSON object in the above form is serialized using
[`to_bjdata`](../../api/basic_json/to_bjdata.md), it is automatically converted into a compact BJData ND-array. The
only exception is, that when the 1-dimensional vector stored in `"_ArraySize_"` contains a single integer or two
integers with one being 1, a regular 1-D optimized array is generated.
[`to_bjdata`](../../api/basic_json/to_bjdata.md), it is automatically converted into a compact BJData ND-array. When
the 1-dimensional vector stored in `"_ArraySize_"` contains a single integer or two integers with one being 1, a
regular 1-D optimized array is generated instead.
An object is only converted if the annotation actually describes a packed array; otherwise it is serialized as a
regular JSON object. This requires all of the following:
- `"_ArrayType_"` is one of `uint8`, `int8`, `uint16`, `int16`, `uint32`, `int32`, `uint64`, `int64`, `single`,
`double`, `char`, or `byte`,
- `"_ArraySize_"` is an array, since the dimensions are written as the ND-array header's length,
- every entry of `"_ArraySize_"` is a non-negative integer, and their product is representable as a `std::size_t`,
- `"_ArrayData_"` holds exactly that many elements, and
- every element of `"_ArrayData_"` is a number of the kind named by `"_ArrayType_"` (a floating-point number for
`single` and `double`, an integer otherwise).
The current version of this library does not yet support automatic detection of and conversion from a nested JSON
array input to a BJData ND-array.
@@ -35,6 +35,19 @@ The library uses the following mapping from JSON values types to BSON types:
The mapping is **incomplete**, since only JSON-objects (and things contained therein) can be serialized to BSON.
Also, keys may not contain U+0000, since they are serialized a zero-terminated c-strings.
!!! warning "BSON type 0x11 interoperability"
The BSON specification defines type `0x11` as a Timestamp. This library uses marker `0x11` when serializing
`number_unsigned` values in the range `9223372036854775808..18446744073709551615`. Other BSON implementations may
therefore interpret these values as Timestamps instead of unsigned integers.
!!! info "Binary values without a subtype"
BSON requires every binary value to have a subtype. If a binary value has no subtype, this library serializes it
with the generic subtype `0x00`. After deserialization, `has_subtype()` returns `true` and `subtype()` returns `0`.
As a result, serializing and deserializing a JSON object containing such a value produces a different JSON object,
even though the binary data is unchanged.
??? example
```cpp
@@ -82,8 +95,19 @@ The library maps BSON record types to JSON value types as follows:
!!! note "Handling of BSON type 0x11"
BSON type 0x11 is used to represent uint64 numbers. This library treats these values purely as uint64 numbers
and does not parse them into date-related formats.
This library deserializes BSON type `0x11` (Timestamp) as a `number_unsigned` value. The 64-bit value is preserved,
but the Timestamp type information is not.
!!! warning "Lenient BSON input handling"
The BSON reader is lenient in a few areas where the BSON specification is more restrictive:
- array element keys are not checked against the required decimal sequence (`0`, `1`, `2`, ...),
- any non-zero byte is accepted as `true` for the boolean type, and
- the payload for binary subtype `0x02` is returned as-is, including its inner length prefix.
If BSON input must be validated for strict specification compliance, validate it separately before passing it to
`from_bson()`.
??? example
@@ -7,12 +7,12 @@ extremely small code sizes, fairly small message size, and extensibility without
- [CBOR Website](http://cbor.io) - the main source on CBOR
- [CBOR Playground](http://cbor.me) - an interactive webpage to translate between JSON and CBOR
- [RFC 7049](https://tools.ietf.org/html/rfc7049) - the CBOR specification
- [RFC 8949](https://www.rfc-editor.org/rfc/rfc8949.html) - the CBOR specification
## Serialization
The library uses the following mapping from JSON values types to CBOR types according to the CBOR specification
([RFC 7049](https://www.rfc-editor.org/rfc/rfc7049.html)):
([RFC 8949](https://www.rfc-editor.org/rfc/rfc8949.html)):
| JSON value type | value/range | CBOR type | first byte |
|-----------------|--------------------------------------------|-----------------------------------|------------|
@@ -160,14 +160,11 @@ The library maps CBOR types to JSON value types as follows:
The mapping is **incomplete** in the sense that not all CBOR types can be converted to a JSON value. The following CBOR types are not supported and will yield parse errors:
- date/time (0xC0..0xC1)
- bignum (0xC2..0xC3)
- decimal fraction (0xC4)
- bigfloat (0xC5)
- expected conversions (0xD5..0xD7)
- simple values (0xE0..0xF3, 0xF8)
- undefined (0xF7)
Tagged items (0xC0..0xDB) are not interpreted either; see the note on tagged items below.
!!! warning "Negative integer overflow"
CBOR negative integers (major type 1) are decoded as `-1 - n`. If the encoded magnitude `n` is too large for the
@@ -181,7 +178,7 @@ The library maps CBOR types to JSON value types as follows:
!!! warning "Tagged items"
Tagged items will throw a parse error by default. They can be ignored by passing `cbor_tag_handler_t::ignore` to function `from_cbor`. They can be stored by passing `cbor_tag_handler_t::store` to function `from_cbor`.
Tagged items (0xC0..0xDB) will throw a parse error by default. They can be ignored by passing `cbor_tag_handler_t::ignore` to function `from_cbor`, in which case the tag is skipped and the enclosed data item is parsed on its own. They can be stored by passing `cbor_tag_handler_t::store` to function `from_cbor`. Note that no tag is ever interpreted: for instance, a text string tagged with tag 0 (date/time) stays a string.
??? example
@@ -69,6 +69,13 @@ The library uses the following mapping from JSON values types to UBJSON types ac
Note that `use_size = true` alone may result in larger representations - the benefit of this parameter is that the
receiving side is immediately informed on the number of elements of the container.
An array whose type marker is `Z` (null), `T` (true) or `F` (false) stores no payload at all, because the marker
already is the value. Its declared count is therefore the only thing that decides how much memory the receiving side
allocates, and a handful of bytes can describe billions of elements. `from_ubjson` rejects such an array with
[`out_of_range.408`](../../home/exceptions.md#jsonexceptionout_of_range408) when the count exceeds 1,048,576
(`1 << 20`), and `to_ubjson` writes longer arrays of these types without the annotation, so any value it produces
can be read back.
!!! info "Binary values"
If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the UBJSON
+88 -5
View File
@@ -47,6 +47,58 @@ json j = {{"one", 1}, {"two", 2}};
auto m = j.get<std::map<std::string, int>>(); // {{"one", 1}, {"two", 2}}
```
`#!cpp std::pair` and `#!cpp std::tuple` are also supported, converting positionally to and from a JSON array:
```cpp
json j = {1.0, "hello", 42};
auto t = j.get<std::tuple<double, std::string, int>>(); // {1.0, "hello", 42}
```
!!! warning "Serializing a `std::pair`/`std::tuple` whose every element is a string-keyed pair"
When *every* element of a `#!cpp std::pair` or `#!cpp std::tuple` is itself a two-element array whose first
element is a string (for example `#!cpp std::pair<std::string, int>`), serializing it produces a JSON **object**
instead of the expected array:
```cpp
using kv = std::pair<std::string, int>;
json j = std::pair<kv, kv>{{"a", 1}, {"b", 2}}; // {"a":1,"b":2}, not [["a",1],["b",2]]
```
This is a consequence of the [brace-initializer object-detection rule](creating_values.md): the same rule that
lets `#!cpp json{{"a", 1}, {"b", 2}}` create an object also fires here. The resulting object cannot be read back
into the original type (`#!cpp get<std::pair<kv, kv>>()` throws [`type_error.302`](../home/exceptions.md#jsonexceptiontype_error302)),
and duplicate keys collapse into one, losing elements. This only affects `#!cpp std::pair`/`#!cpp std::tuple`
themselves; a `#!cpp std::vector<std::pair<std::string, int>>`, or a pair/tuple with at least one element that is
not a string-keyed pair, serializes to an array as expected. To force an array, build one explicitly from the
elements with [`array`](../api/basic_json/array.md):
```cpp
std::pair<kv, kv> p{{"a", 1}, {"b", 2}};
json a = json::array({p.first, p.second}); // [["a",1],["b",2]]
```
!!! info "Extracting references into a tuple"
A tuple type may also hold references (e.g. `#!cpp std::tuple<double&, std::string&>`) to avoid copying: `get`
then returns a tuple of references pointing directly at the elements stored inside the `basic_json` array,
rather than a tuple of copies:
```cpp
json j = {1.0, "hello"};
auto refs = j.get<std::tuple<double&, std::string&>>();
std::get<1>(refs) = "world"; // modifies j[1] in place
```
A referenced element must name the type the library actually *stores* — one of [`boolean_t`](../api/basic_json/boolean_t.md),
[`number_integer_t`](../api/basic_json/number_integer_t.md), [`number_unsigned_t`](../api/basic_json/number_unsigned_t.md),
[`number_float_t`](../api/basic_json/number_float_t.md), [`string_t`](../api/basic_json/string_t.md),
[`binary_t`](../api/basic_json/binary_t.md), [`array_t`](../api/basic_json/array_t.md), or
[`object_t`](../api/basic_json/object_t.md). There is nothing else to refer to, so a reference to any other type is a
compile error even when a conversion would exist: `#!cpp std::tuple<int&>` is rejected, because the library stores a
`#!cpp number_integer_t` (`#!cpp std::int64_t` by default) and not an `#!cpp int`. This restriction applies only to
reference elements — a plain `#!cpp std::tuple<int>` converts by value as usual.
## Implicit conversions
By default, a JSON value implicitly converts to a compatible C++ type, so the explicit `get` call can often be omitted:
@@ -94,17 +146,34 @@ which forces the explicit `get` form and can catch unintended conversions at com
with a custom `adl_serializer<std::optional<T>>` specialization. Prefer `get<std::optional<T>>()`/`get_to()`
over `static_cast` for optional types.
!!! warning "Converting to a fixed-size `std::array` does not check length"
!!! warning "Converting to a fixed-size destination does not check the array size"
Converting a JSON array to `#!cpp std::array<T, N>` does not check that the JSON array's size matches `N`:
if the JSON array is longer, the extra elements are silently dropped; if it is shorter, the remaining
`std::array` elements are left default-constructed. No exception is thrown in either case.
Some destination types have a size that is fixed by their C++ type rather than by the JSON value:
`#!cpp std::pair<A, B>`, `#!cpp std::tuple<Ts...>`, `#!cpp std::array<T, N>`, C arrays `#!cpp T[N]`, and
`#!cpp std::map`/`#!cpp std::unordered_map` with a non-string key type (which is read from an array of
two-element arrays). All of them read exactly as many elements as they need via
[`at`](../api/basic_json/at.md) and **never compare the JSON array's size to that number**. The two
mismatch directions therefore behave differently:
- The JSON array has **too many** elements: the surplus is **silently discarded**, and no exception is
thrown.
- The JSON array has **too few** elements: `at` throws
[`out_of_range.401`](../home/exceptions.md#jsonexceptionout_of_range401) for the first missing index --
an out-of-range error, not a [`type_error`](../home/exceptions.md#type-errors), even though the cause
is a shape mismatch.
```cpp
json j = {1, 2, 3, 4, 5};
auto a = j.get<std::array<int, 3>>(); // {1, 2, 3} -- elements 4 and 5 silently dropped
auto a = j.get<std::array<int, 3>>(); // {1, 2, 3} -- elements 4 and 5 silently dropped
auto p = j.get<std::pair<int, int>>(); // (1, 2) -- elements 3, 4, and 5 silently dropped
json k = {1};
auto q = k.get<std::pair<int, int>>(); // ❌ throws out_of_range.401
```
If a size mismatch is an error in your application, check the size yourself before converting.
## Omitting a field when serializing `std::optional`
By default, `to_json` for `std::optional<T>` writes either the value or `#!json null` -- there is no built-in way
@@ -136,6 +205,20 @@ std::vector<int> numbers = {1, 2, 3};
json j = numbers; // [1,2,3]
```
!!! info "Constructing from a C++20 range view"
A `json` array can also be constructed directly from a C++20 range view (`std::ranges::view`), such as the result
of `std::views::filter` or `std::views::transform` -- no intermediate container is needed:
```cpp
std::vector<int> nums{1, 2, 37, 42, 21};
auto filtered = nums | std::views::filter([](int i) { return i > 10; });
json j(filtered); // [37,42,21]
```
This requires [`JSON_HAS_RANGES`](../api/macros/json_has_ranges.md) to be enabled and is unavailable on MinGW due
to incomplete C++20 ranges support there.
## Your own types
The conversions above are built in for standard types. To make the same syntax work for **your own** types, provide
+8
View File
@@ -137,6 +137,14 @@ behavior is deprecated and switched off (`0`) by default.
See [full documentation of `JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON`](../api/macros/json_use_legacy_discarded_value_comparison.md).
## `JSON_USE_SIMDUTF`
When defined, UTF-8 validation of JSON strings read from contiguous byte input is delegated to the
[simdutf](https://github.com/simdutf/simdutf) library instead of the built-in scalar validator. This is an opt-in
external dependency and is not defined by default.
See [full documentation of `JSON_USE_SIMDUTF`](../api/macros/json_use_simdutf.md).
## `NLOHMANN_DEFINE_TYPE_*(...)`, `NLOHMANN_DEFINE_DERIVED_TYPE_*(...)`
The library defines 12 macros to simplify the serialization/deserialization of types. See the page on
@@ -53,6 +53,12 @@ If you do want to preserve the **insertion order**, you can use the type [`nlohm
Alternatively, you can use a more sophisticated ordered map like [`tsl::ordered_map`](https://github.com/Tessil/ordered-map) ([integration](https://github.com/nlohmann/json/issues/546#issuecomment-304447518)) or [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map) ([integration](https://github.com/nlohmann/json/issues/485#issuecomment-333652309)).
The [`ordered_map`](../api/ordered_map.md) behind `nlohmann::ordered_json` is deliberately minimal and has no lookup
index, so every key access is a linear scan and building an object of `n` keys costs O(n²). This is unnoticeable at
typical object sizes but becomes significant for objects with many thousands of keys; see
[`ordered_map` complexity](../api/ordered_map.md#complexity). The alternatives above keep a lookup index and do not
have this cost.
### Notes on parsing
Note that you also need to call the right [`parse`](../api/basic_json/parse.md) function when reading from a file.
@@ -28,6 +28,22 @@ Inputs consisting of multiple values separated by newlines are handled by the [J
By default, the library rejects comments and trailing commas. Both can be enabled with parameters of the `parse`
function — see [comments](../comments.md) and [trailing commas](../trailing_commas.md).
## Strictness and trailing data
[`parse`](../../api/basic_json/parse.md) reads a single JSON value and requires the whole input to be consumed: any
non-whitespace data after the value is reported as a parse error. Use it when you want to guarantee that an input is
exactly one complete JSON document.
[`operator>>`](../../api/operator_gtgt.md) follows relaxed `#!cpp std::istream` semantics instead: it parses one JSON
value and leaves the stream positioned right after it, without requiring the rest of the stream to be consumed. This is
what makes it possible to read several concatenated values from the same stream, but it also means that "a valid
document followed by trailing bytes" is accepted rather than rejected. If you are validating conformance, or need to
reject any input that is not exactly one JSON document, prefer `parse`.
When using `operator>>` to read several concatenated values this way, a value that is a number must be followed by
whitespace, because `operator>>` consumes the character that terminates a number — see the
[`operator>>` notes](../../api/operator_gtgt.md#notes) for details and examples.
## SAX vs. DOM parsing
The library offers two parsing models:
@@ -49,4 +49,5 @@ JSON Lines input with more than one value is treated as invalid JSON by the [`pa
with a JSON Lines input does not work, because the parser will try to parse one value after the last one.
This is different from parsing a stream of *concatenated* (non-newline-delimited) JSON values, for which
`operator>>` does work -- see its [notes](../../api/operator_gtgt.md#notes) for details.
`operator>>` does work, provided that a value that is a number is followed by whitespace -- see its
[notes](../../api/operator_gtgt.md#notes) for details.
+138 -8
View File
@@ -8,41 +8,72 @@ the result of an internet search. If you know further customers of the library,
## Space Exploration
- [**Peregrine Lunar Lander Flight 01**](https://en.wikipedia.org/wiki/Peregrine_Mission_One) - The library was used for payload management in the **Peregrine Moon Lander**, developed by **Astrobotic Technology** and launched as part of NASA's **Commercial Lunar Payload Services (CLPS)** program. After six days in orbit, the spacecraft was intentionally redirected into Earth's atmosphere, where it burned up over the Pacific Ocean on **January 18, 2024**.
- [**NASA Unsteady Pressure-Sensitive Paint Processing**](https://github.com/nasa/upsp-processing), NASA software for processing high-speed video recordings of wind tunnel tests on launch vehicle and aircraft models
- [**Terma TEMU**](https://temu.terma.com/docs/public/temu-release-notes/latest/copying/json-for-modern-cpp.html), an emulator of spacecraft on-board computers used to develop and validate flight software for European space missions
## Automotive
- [**Alexa Auto SDK**](https://github.com/alexa/alexa-auto-sdk), a software development kit enabling the integration of Alexa into automotive systems
- [**Apollo**](https://github.com/ApolloAuto/apollo), a framework for building autonomous driving systems
- [**Automotive Grade Linux (AGL)**](https://download.automotivelinux.org/AGL/release/jellyfish/latest/qemux86-64/deploy/licenses/nlohmann-json/), a collaborative open-source platform for automotive software development
- [**Autoware**](https://github.com/autowarefoundation/autoware_universe), an open-source software stack for autonomous driving built on ROS 2
- [**Eclipse S-CORE**](https://github.com/eclipse-score/nlohmann_json), an open-source software platform for the software-defined vehicle backed by major automotive manufacturers and suppliers
- [**Genesis Motor** (infotainment)](http://webmanual.genesis.com/ccIC/AVNT/JW/KOR/English/reference010.html), a luxury automotive brand
- [**Hyundai** (infotainment)](https://www.hyundai.com/wsvc/ww/download.file.do?id=/content/hyundai/ww/data/opensource/data/GN7-2022/licenseCode/info), a global automotive brand
- [**Kia** (infotainment)](http://webmanual.kia.com/PREM_GEN6/AVNT/RJPE/KOR/Korean/reference010.html), a global automotive brand
- [**Mercedes-Benz Operating System (MB.OS)**](https://group.mercedes-benz.com/careers/about-us/mercedes-benz-operating-system/), a core component of the vehicle software ecosystem from Mercedes-Benz
- [**NVIDIA DRIVE OS**](https://developer.nvidia.com/docs/drive/drive-os/6.0.5/public/driveworks-nvcgf/dwx_open_source_attribution.html), the operating system and DriveWorks SDK powering NVIDIA's platform for autonomous vehicles
- [**Rivian** (infotainment)](https://assets.ctfassets.net/2md5qhoeajym/3cwyo4eoufk4yingUwusFt/ded2c47da620fdfc99c88c7156d2c1d8/In-Vehicle_OSS_Attribution_2024__11-24_.pdf), an electric vehicle manufacturer
- [**Suzuki** (infotainment)](https://www.globalsuzuki.com/motorcycle/ipc/oss/oss_48KA_00.pdf), a global automotive and motorcycle manufacturer
## Gaming and Entertainment
- [**Anno 117: Pax Romana**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a city-building strategy game set in the Roman Empire
- [**Assassin's Creed: Mirage**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
- [**Battlefield 6**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a military first-person shooter known for its large-scale multiplayer battles
- [**Battlefield: REDSEC**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a free-to-play battle royale experience set in the Battlefield universe
- [**BioMenace: Remastered**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a remaster of the classic side-scrolling platform shooter
- [**Chasm: The Rift**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
- [**College Football 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a college football simulation game featuring gameplay that mimics real-life college teams and competitions
- [**College Football 26**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a college football simulation game featuring licensed teams and stadiums
- [**College Football 27**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), the latest installment of the college football simulation series
- [**Concepts**](https://concepts.app/en/licenses), a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
- [**Depthkit**](https://www.depthkit.tv/third-party-licenses), a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
- [**Dune: Awakening**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), an open-world survival MMO set on the desert planet Arrakis
- [**EA Sports FC 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), an association football simulation with club, career, and online modes
- [**EA Sports FC 26**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), the latest installment of the association football simulation series
- [**EA Sports UFC 6**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a mixed martial arts fighting simulation
- [**FiveM**](https://github.com/citizenfx/fivem), a modification framework for Grand Theft Auto V that powers custom multiplayer servers
- [**FLUX:: Immersive**](https://doc.flux.audio/syrah/Credits.html), a suite of professional audio processing and immersive mixing plugins used in music and post-production
- [**IMG.LY**](https://img.ly/acknowledgements), a platform offering creative tools and SDKs for integrating advanced image and video editing in applications
- [**immersivetech**](https://immersitech.io/open-source-third-party-software/), a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications
- [**Kodi**](https://github.com/xbmc/xbmc/blob/master/xbmc/utils/JSONVariantWriter.cpp), a home theater and media center application
- [**LOOT**](https://loot.readthedocs.io/_/downloads/en/0.13.0/pdf/), a tool for optimizing the load order of game plugins, commonly used in The Elder Scrolls and Fallout series
- [**LunaTranslator**](https://github.com/HIllya51/LunaTranslator/blob/main/src/NativeImpl/LunaSubprocess/aspatch.cpp), a real-time translation tool for visual novels
- [**MaaAssistantArknights**](https://github.com/MaaAssistantArknights/MaaAssistantArknights/blob/dev-v2/src/MaaCore/Vision/Roguelike/BlackFlow/BlackFlowMapAnalyzer.cpp), an automation assistant for the mobile game Arknights
- [**Madden NFL 25**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
- [**Madden NFL 26**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), an American football simulation with franchise and team management modes
- [**Madden NFL 27**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), the latest installment of the American football simulation series
- [**Marne**](https://marne.io/licenses), an unofficial private server platform for hosting custom Battlefield 1 game experiences
- [**Minecraft**](https://www.minecraft.net/zh-hant/attribution), a popular sandbox video game
- [**Mumble**](https://github.com/mumble-voip/mumble), a low-latency, open-source voice chat application widely used by gaming communities
- [**NHL 22**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
- [**OBS Studio**](https://github.com/obsproject/obs-studio), a free and open-source suite for video recording and live streaming
- [**OpenRCT2**](https://github.com/OpenRCT2/OpenRCT2/blob/develop/src/openrct2/core/JsonFwd.hpp), an open source re-implementation of RollerCoaster Tycoon 2
- [**Pixelpart**](https://pixelpart.net/documentation/book/third-party.html), a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
- [**Razer Cortex**](https://mysupport.razer.com/app/answers/detail/a_id/14146/~/open-source-software-for-razer-software), a gaming performance optimizer and system booster designed to enhance the gaming experience
- [**Red Dead Redemption II**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
- [**RetroArch**](https://github.com/libretro/RetroArch), a frontend for emulators, game engines, and media players built on the libretro API
- [**shadPS4**](https://github.com/shadps4-emu/shadPS4/blob/main/src/core/user_manager.h), a PlayStation 4 emulator for Windows, Linux and macOS
- [**skate.**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a free-to-play skateboarding game set in an open world
- [**Snapchat**](https://www.snap.com/terms/license-android), a multimedia messaging and augmented reality app for communication and entertainment
- [**Steel Century Groove**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), an action game released in 2026
- [**Sunshine**](https://github.com/LizardByte/Sunshine/blob/master/src/confighttp.h), a self-hosted game streaming host compatible with Moonlight clients
- [**Tactics Ogre: Reborn**](https://www.square-enix-games.com/en_US/documents/tactics-ogre-reborn-pc-installer-software-and-associated-plug-ins-disclosure), a tactical role-playing game featuring strategic battles and deep storytelling elements
- [**Throne and Liberty**](https://www.amazon.com/gp/help/customer/display.html?nodeId=T7fLNw5oAevCMtJFPj&pop-up=1), an MMORPG that offers an expansive fantasy world with dynamic gameplay and immersive storytelling
- [**Unity Vivox**](https://docs.unity3d.com/Packages/com.unity.services.vivox@15.1/license/Third%20Party%20Notices.html), a communication service that enables voice and text chat functionality in multiplayer games developed with Unity
- [**xemu**](https://github.com/xemu-project/xemu), an emulator of the original Xbox console
- [**Zool: Redimensioned**](https://www.mobygames.com/person/1195889/niels-lohmann/credits/), a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
- [**immersivetech**](https://immersitech.io/open-source-third-party-software/), a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications
## Consumer Electronics
@@ -50,109 +81,195 @@ the result of an internet search. If you know further customers of the library,
- [**Canon CanoScan LIDE**](https://carolburo.com/wp-content/uploads/2024/06/LiDE400_OnlineManual_Win_FR_V02.pdf), a series of flatbed scanners offering high-resolution image scanning for home and office use
- [**Canon PIXMA Printers**](https://www.mediaexpert.pl/products/files/73/7338196/Instrukcja-obslugi-CANON-Pixma-TS7450i.pdf), a line of all-in-one inkjet printers known for high-quality printing and wireless connectivity
- [**Cisco Webex Desk Camera**](https://www.cisco.com/c/dam/en_us/about/doing_business/open_source/docs/CiscoWebexDeskCamera-23-1622100417.pdf), a video camera designed for professional-quality video conferencing and remote collaboration
- [**DJI Edge SDK**](https://github.com/dji-sdk/Edge-SDK-V2-Demo), the reference applications for DJI's Edge SDK, used to build edge computing services on DJI drone docks
- [**Elgato Stream Deck**](https://github.com/elgatosf/streamdeck-obs-plugin2), a family of programmable control surfaces for content creators and their plugin ecosystem
- [**Instagrid**](https://instagrid.co/intellectual-property/foss), a manufacturer of portable, high-performance battery systems for professional mobile power supply
- [**iRobot**](https://iot-content.irobot.com/iw/sfsites/c/cms/delivery/media/MCKRLTPDJSSJBNJKDA5SG5UVVIIQ), a manufacturer of autonomous home robots including the Roomba vacuum cleaner range
- [**Logitech Logi Bolt**](https://opensource.logitech.com/wiki/Logi_BoltApp/), the management application for Logitech's secure wireless connectivity technology
- [**Novitus**](https://novitus.pl/licencjepensource), a manufacturer of fiscal cash registers and point-of-sale devices
- [**Philips Hue Personal Wireless Lighting**](http://2ak5ape.257.cz/), a smart lighting system for customizable and wireless home illumination
- [**Ray-Ban Meta Smart glasses**](https://www.meta.com/de/en/legal/smart-glasses/third-party-notices-android/03/), a pair of smart glasses designed for capturing photos and videos with integrated connectivity and social features
- [**Razer Synapse**](https://mysupport.razer.com/app/answers/detail/a_id/14146/~/open-source-software-for-razer-software), a unified configuration software enabling hardware customization for Razer devices
- [**Sharp Professional Displays**](https://jp.sharp/restricted/business/lcd-display/cms/images/source_pnla862/PN-LA652_752_862_LicenseInformation.pdf), a range of large-format interactive displays for business and education
- [**Siemens SINEMA Remote Connect**](https://cache.industry.siemens.com/dl/files/790/109793790/att_1054961/v2/OSS_SINEMA-RC_86.pdf), a remote connectivity solution for monitoring and managing industrial networks and devices securely
- [**Skydio**](https://pages.skydio.com/rs/784-TUF-591/images/Open%20Source%20Software%20Notice%20v0.2.html), a manufacturer of autonomous drones for inspection, public safety, and defense applications
- [**Sony PlayStation 4**](https://doc.dl.playstation.net/doc/ps4-oss/index.html), a gaming console developed by Sony that offers a wide range of games and multimedia entertainment features
- [**Sony Spatial Reality Display**](https://www.sony.co.jp/en/Products/Developer-Spatial-Reality-display/download/dcc-tools/blender-plugin/SpatiaRealityDisplayPluginforPreviewBL_Manual.pdf), a glasses-free stereoscopic 3D display and its plugins for Blender, 3ds Max, and ZBrush
- [**Sony Virtual Webcam Driver for Remote Camera**](https://helpguide.sony.net/rc/vwd/v1/zh-cn/print.pdf), a software driver that enables the use of Sony cameras as virtual webcams for video conferencing and streaming
- [**Yamaha Clavinova**](https://usa.yamaha.com/files/download/other_assets/1/2298171/CLP-800_oss_license.pdf), a series of digital pianos combining acoustic piano feel with digital sound technology
## Operating Systems
## Operating Systems and Platforms
- [**Apple iOS and macOS**](https://www.apple.com/macos), a family of operating systems developed by Apple, including iOS for mobile devices and macOS for desktop computers
- [**Chromium**](https://chromium.googlesource.com/chromium/src/+/main/third_party/nlohmann_json/), the open-source browser project that Google Chrome, Microsoft Edge, and many other browsers are built on, where the library is used as data container for on-device model execution
- [**Google Fuchsia**](https://fuchsia.googlesource.com/third_party/json/), an open-source operating system developed by Google, designed to be secure, updatable, and adaptable across various devices
- [**LG webOS**](https://github.com/webosose/com.webos.service.camera), a Linux-based operating system used in LG smart TVs, signage, and embedded devices
- [**Microsoft Azure Linux**](https://github.com/microsoft/azurelinux), a Linux distribution developed by Microsoft for Azure infrastructure and edge workloads
- [**OpenHarmony**](https://github.com/openharmony/third_party_json), an open-source operating system for smart devices and the foundation of HarmonyOS
- [**SerenityOS**](https://github.com/SerenityOS/serenity), an open-source operating system that aims to provide a simple and beautiful user experience with a focus on simplicity and elegance
- [**Windows Subsystem for Linux**](https://github.com/microsoft/WSL), a compatibility layer that runs Linux environments natively on Windows
- [**Yocto**](http://ftp.emacinc.com/openembedded-sw/kirkstone-icop-5.15-kirkstone-6.0/archive-2024-10/pn8m-090t-ppc/licenses/nlohmann-json/), a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications
## Development Tools and IDEs
- [**Accentize SpectralBalance**](https://www.accentize.com/products/SpectralBalanceManual.pdf), an adaptive speech analysis tool designed to enhance audio quality by optimizing frequency balance in recordings
- [**Airbus Ghidralligator**](https://www.cyber.airbus.com/en/newsroom/stories/2025-06-ghidralligator), a Ghidra-based emulator from Airbus CyberSecurity used to fuzz and analyse embedded firmware
- [**Apache brpc**](https://github.com/apache/brpc/blob/master/src/butil/iobuf.h), an industrial-grade remote procedure call framework for C++
- [**Arm Compiler for Linux**](https://documentation-service.arm.com/static/66558e9d876c8d213b7843e4), a software development toolchain for compiling and optimizing applications on Arm-based Linux systems
- [**BBEdit**](https://s3.amazonaws.com/BBSW-download/BBEdit_15.1.2_User_Manual.pdf), a professional text and code editor for macOS
- [**CoderPad**](https://coderpad.io), a collaborative coding platform that enables real-time code interviews and assessments for developers; the library is included in every CoderPad instance and can be accessed with a simple `#include "json.hpp"`
- [**Codon**](https://github.com/exaloop/codon/blob/develop/jupyter/jupyter.h), an ahead-of-time compiler for a Python-like language
- [**Compiler Explorer**](https://godbolt.org), a web-based tool that allows users to write, compile, and visualize the assembly output of code in various programming languages; the library is readily available and accessible with the directive `#include <nlohmann/json.hpp>`.
- [**GitHub CodeQL**](https://github.com/github/codeql), a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
- [**Flutter**](https://github.com/flutter/flutter/blob/master/engine/src/flutter/impeller/compiler/reflector.cc), a UI toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase
- [**Fraunhofer VVenC**](https://github.com/fraunhoferhhi/vvenc), a fast and efficient encoder for the Versatile Video Coding (H.266/VVC) standard
- [**GitHub CodeQL**](https://github.com/github/codeql/blob/main/shared/cpp/Diagnostics.h), a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
- [**GoPro ngfx**](https://github.com/gopro/ngfx), a low-level graphics abstraction and profiling framework developed by GoPro
- [**gRPC**](https://github.com/grpc/grpc/blob/master/tools/artifact_gen/utils.h), a high-performance universal remote procedure call framework
- [**Hex-Rays**](https://docs.hex-rays.com/user-guide/user-interface/licenses), a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
- [**ImHex**](https://github.com/WerWolv/ImHex), a hex editor designed for reverse engineering, providing advanced features for data analysis and manipulation
- [**Intel GITS**](https://github.com/intel/gits), a tool for capturing and replaying graphics API calls for debugging and performance analysis
- [**Intel GPA Framework**](https://intel.github.io/gpasdk-doc/src/licenses.html), a suite of cross-platform tools for capturing, analyzing, and optimizing graphics applications across different APIs
- [**Intopix**](https://www.intopix.com/software-licensing), a provider of advanced image processing and compression solutions used in software development and AV workflows
- [**Java SE**](https://www.oracle.com/a/tech/docs/jdk8-lium.pdf), the core Java platform that provides the libraries and runtime needed to build and run general-purpose Java applications
- [**MKVToolNix**](https://mkvtoolnix.download/doc/README.md), a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
- [**Meta Yoga**](https://github.com/facebook/yoga), a layout engine that facilitates flexible and efficient user interface design across multiple platforms
- [**NVIDIA Nsight Compute**](https://docs.nvidia.com/nsight-compute/2022.2/pdf/CopyrightAndLicenses.pdf), a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
- [**MKVToolNix**](https://mkvtoolnix.download/doc/README.md), a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
- [**MRTech IFF SDK**](https://mr-technologies.com/pub/iff-sdk-manual-2-0-1/iff-sdk-manual-2-0-1.pdf), an image processing SDK for machine vision applications with GPU-accelerated pipelines
- [**Nix**](https://github.com/NixOS/nix/blob/master/src/nix/build.cc), a purely functional package manager
- [**Notepad++**](https://github.com/notepad-plus-plus/notepad-plus-plus), a free source code editor that supports various programming languages
- [**NVIDIA Nsight Compute**](https://docs.nvidia.com/nsight-compute/2022.2/pdf/CopyrightAndLicenses.pdf), a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
- [**openFrameworks**](https://github.com/openframeworks/openFrameworks/blob/master/libs/openFrameworks/utils/ofJson.h), a community-developed C++ toolkit for creative coding
- [**OpenRGB**](https://gitlab.com/CalcProgrammer1/OpenRGB), an open source RGB lighting control that doesn't depend on manufacturer software
- [**OpenTelemetry C++**](https://github.com/open-telemetry/opentelemetry-cpp), a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
- [**Oracle GraalVM**](https://docs.oracle.com/en/graalvm/jdk/21/docs/licensing-information/), a high-performance JDK distribution with ahead-of-time compilation and polyglot runtime support
- [**Philips amp-cucumber-cpp-runner**](https://github.com/philips-software/amp-cucumber-cpp-runner), a behaviour-driven development test runner for embedded C++ software developed at Philips
- [**Qt Creator**](https://doc.qt.io/qtcreator/qtcreator-attribution-json-nlohmann.html), an IDE for developing applications using the Qt application framework
- [**Qt for MCUs**](https://doc.qt.io/QtForMCUs/quickultralite-attribution-nlohmann-json.html), a graphics framework for building fluid user interfaces on microcontrollers
- [**React Native**](https://github.com/react/react-native/blob/main/packages/react-native/ReactCxxPlatform/react/devsupport/PackagerConnection.cpp), a framework for building native mobile applications using React
- [**Scanbot SDK**](https://docs.scanbot.io/barcode-scanner-sdk/web/third-party-libraries/), a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications
- [**STMicroelectronics TouchGFX**](https://www.st.com/resource/en/additional_license_terms/additional-license-terms-x-cube-touchgfx.html), a graphical user interface framework shipped with STM32 microcontrollers for building embedded HMIs
- [**swagger-codegen**](https://github.com/swagger-api/swagger-codegen/blob/master/samples/server/petstore/pistache-server/model/Pet.h), a template-driven engine that generates API clients and server stubs from an OpenAPI specification
- [**Swoole**](https://github.com/swoole/swoole-src/blob/master/ext-src/swoole_admin_server.cc), a coroutine-based concurrency engine for PHP
- [**Tracy Profiler**](https://github.com/wolfpld/tracy/blob/master/profiler/src/profiler/TracyLlm.hpp), a real-time frame profiler for games and other applications
- [**WasmEdge**](https://github.com/WasmEdge/WasmEdge/blob/master/plugins/wasi_nn/GGML/tts/tts_core.cpp), a lightweight WebAssembly runtime for edge and cloud workloads
- [**x64dbg**](https://github.com/x64dbg/x64dbg/blob/development/src/cross/remote_table/TableRpcData.h), an open source user mode debugger for Windows, aimed at reverse engineering and malware analysis
## Machine Learning and AI
- [**Alibaba MNN**](https://github.com/alibaba/MNN), a lightweight deep learning inference engine for mobile and embedded devices
- [**AMD Gaia**](https://github.com/amd/gaia), an open-source framework for running generative AI applications locally on AMD hardware
- [**AMD Vitis AI (VAIP)**](https://github.com/amd/vaip), the execution provider stack that runs AI models on AMD Ryzen AI and adaptive computing devices
- [**Apple Core ML Tools**](https://github.com/apple/coremltools), a set of tools for converting and configuring machine learning models for deployment in Apple's Core ML framework
- [**Avular Mobile Robotics**](https://www.avular.com/licenses/nlohmann-json-3.9.1.txt), a platform for developing and deploying mobile robotics solutions
- [**FunASR**](https://github.com/modelscope/FunASR/blob/main/runtime/http/bin/asr_sessions.h), a speech recognition toolkit for training and deploying end-to-end models
- [**Google gemma.cpp**](https://github.com/google/gemma.cpp), a lightweight C++ inference engine designed for running AI models from the Gemma family
- [**Google Magenta The Infinite Crate**](https://github.com/magenta/the-infinite-crate), an open-source generative AI plugin for digital audio workstations from Google's Magenta research team
- [**GPT4All**](https://github.com/nomic-ai/gpt4all/blob/main/gpt4all-chat/src/tool.h), a desktop application for running local large language models on consumer hardware
- [**Huawei MindSpore**](https://github.com/mindspore-ai/mindspore/blob/master/Third_Party_Open_Source_Software_Notice), a deep learning framework for training and inference across device, edge, and cloud
- [**KTransformers**](https://github.com/kvcache-ai/ktransformers/blob/main/archive/csrc/balance_serve/sched/model_config.h), a framework for heterogeneous large language model inference
- [**llama.cpp**](https://github.com/ggerganov/llama.cpp), a C++ library designed for efficient inference of large language models (LLMs), enabling streamlined integration into applications
- [**LocalAI**](https://github.com/mudler/LocalAI/blob/master/backend/cpp/ds4/dsml_renderer.cpp), a self-hosted inference engine that exposes local models through an OpenAI-compatible API
- [**MLX**](https://github.com/ml-explore/mlx), an array framework for machine learning on Apple Silicon
- [**Mozilla llamafile**](https://github.com/Mozilla-Ocho/llamafile), a tool designed for distributing and executing large language models (LLMs) efficiently using a single file format
- [**NVIDIA ACE**](https://docs.nvidia.com/ace/latest/index.html), a suite of real-time AI solutions designed for the development of interactive avatars and digital human applications, enabling scalable and sophisticated user interactions
- [**NVIDIA Instant NGP**](https://github.com/NVlabs/instant-ngp/blob/master/src/nerf_loader.cu), an implementation of instant neural graphics primitives for rapid scene reconstruction
- [**NVIDIA TensorRT**](https://github.com/NVIDIA/TensorRT), an SDK for high-performance deep learning inference, including its TensorRT-LLM extension for large language models
- [**NVIDIA TensorRT-LLM**](https://github.com/NVIDIA/TensorRT-LLM/blob/main/cpp/tensorrt_llm/common/safetensors.cpp), a toolkit for optimizing and serving large language model inference on GPUs
- [**ONNX Runtime**](https://github.com/microsoft/onnxruntime), a cross-platform inference and training accelerator for machine learning models
- [**OpenVINO**](https://github.com/openvinotoolkit/openvino), Intel's toolkit for optimizing and deploying deep learning inference across CPUs, GPUs, and NPUs
- [**PaddleOCR**](https://github.com/PaddlePaddle/PaddleOCR/blob/main/deploy/cpp_infer/src/modules/text_detection/result.cc), an optical character recognition toolkit that turns documents and images into structured data
- [**PaddlePaddle**](https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/ap/src/axpr/anf_expr.cc), a deep learning framework for distributed training and inference
- [**Peer**](https://support.peer.inc/hc/en-us/articles/17261335054235-Licenses), a platform offering personalized AI assistants for interactive learning and creative collaboration
- [**PyTorch**](https://github.com/pytorch/pytorch), a machine learning framework for building and training neural networks, widely used in research and production
- [**Qualcomm AI Engine Direct**](https://github.com/qualcomm/qai-appbuilder), a toolchain for building and running generative AI applications on Snapdragon devices
- [**sherpa-onnx**](https://github.com/k2-fsa/sherpa-onnx/blob/master/sherpa-onnx/csrc/sentence-piece-tokenizer.cc), a speech toolkit for on-device recognition, synthesis and speaker diarization
- [**stable-diffusion.cpp**](https://github.com/leejet/stable-diffusion.cpp), a C++ implementation of the Stable Diffusion image generation model
- [**TanvasTouch**](https://tanvas.co/tanvastouch-sdk-third-party-acknowledgments), a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
- [**TensorFlow**](https://github.com/tensorflow/tensorflow), a machine learning framework that facilitates the development and training of models, supporting data serialization and efficient data exchange between components
- [**whisper.cpp**](https://github.com/ggml-org/whisper.cpp), a C++ implementation of OpenAI's Whisper automatic speech recognition model
## Scientific Research and Analysis
- [**BLACK**](https://www.black-sat.org/en/stable/installation/linux.html), a bounded linear temporal logic (LTL) satisfiability checker
- [**CERN ALICE O2**](https://github.com/AliceO2Group/AliceO2), the online-offline computing framework of the ALICE heavy-ion experiment at the Large Hadron Collider
- [**CERN Atlas Athena**](https://gitlab.cern.ch/atlas/athena/-/blob/main/Control/PerformanceMonitoring/PerfMonComps/src/PerfMonMTSvc.h), a software framework used in the ATLAS experiment at the Large Hadron Collider (LHC) for performance monitoring
- [**CERN CMSSW**](https://github.com/cms-sw/cmssw), the offline software framework of the CMS experiment at the Large Hadron Collider
- [**CERN Gaudi**](https://gitlab.cern.ch/gaudi/Gaudi), the event-processing framework used by the LHCb and ATLAS experiments at the Large Hadron Collider
- [**ICU**](https://github.com/unicode-org/icu), the International Components for Unicode, a mature library for software globalization and multilingual support
- [**KAMERA**](https://github.com/Kitware/kamera), a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
- [**KiCad**](https://gitlab.com/kicad/code/kicad/-/tree/master/thirdparty/nlohmann_json), a free and open-source software suite for electronic design automation
- [**LLNL ROSE**](https://github.com/llnl/rose), a compiler infrastructure from Lawrence Livermore National Laboratory for building source-to-source program analysis and transformation tools
- [**Maple**](https://www.maplesoft.com/support/help/Maple/view.aspx?path=copyright), a symbolic and numeric computing environment for advanced mathematical modeling and analysis
- [**MeVisLab**](https://mevislabdownloads.mevis.de/docs/current/MeVis/ThirdParty/Documentation/Publish/ThirdPartyReference/index.html), a software framework for medical image processing and visualization.
- [**MITK**](https://github.com/MITK/MITK), the Medical Imaging Interaction Toolkit, a framework for developing interactive medical image processing software
- [**OpenPMD API**](https://openpmd-api.readthedocs.io/en/0.8.0-alpha/backends/json.html), a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
- [**ORNL DataFed**](https://github.com/ORNL/DataFed), a federated scientific data management system developed at Oak Ridge National Laboratory
- [**ParaView**](https://github.com/Kitware/ParaView), an open-source tool for large-scale data visualization and analysis across various scientific domains
- [**QGIS**](https://gitlab.b-data.ch/qgis/qgis/-/blob/backport-57658-to-release-3_34/external/nlohmann/json.hpp), a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
- [**VTK**](https://github.com/Kitware/VTK), a software library for 3D computer graphics, image processing, and visualization
- [**Sandia InterSpec**](https://github.com/sandialabs/InterSpec), spectral radiation analysis software from Sandia National Laboratories for identifying radioactive isotopes
- [**VolView**](https://github.com/Kitware/VolView), a lightweight application for interactive visualization and analysis of 3D medical imaging data.
- [**VTK**](https://github.com/Kitware/VTK), a software library for 3D computer graphics, image processing, and visualization
## Business and Productivity Software
- [**ArcGIS PRO**](https://www.esri.com/content/dam/esrisites/en-us/media/legal/open-source-acknowledgements/arcgis-pro-2-8-attribution-report.html), a desktop geographic information system (GIS) application developed by Esri for mapping and spatial analysis
- [**Autodesk Desktop**](https://damassets.autodesk.net/content/dam/autodesk/www/Company/legal-notices-trademarks/autodesk-desktop-platform-components/internal-autodesk-components-web-page-2023.pdf), a software platform developed by Autodesk for creating and managing desktop applications and services
- [**Check Point**](https://www.checkpoint.com/about-us/copyright-and-trademarks/), a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
- [**EasyEffects**](https://github.com/wwmm/easyeffects/blob/master/src/presets_manager.hpp), an audio effects processor for PipeWire offering limiting, compression and equalization
- [**espanso**](https://github.com/espanso/espanso/blob/dev/espanso-ui/src/win32/native.cpp), a cross-platform text expander
- [**Karabiner-Elements**](https://github.com/pqrs-org/Karabiner-Elements/blob/main/src/share/app_icon.hpp), a keyboard customizer for macOS
- [**MacType**](https://github.com/snowie2000/mactype/blob/directwrite/settings.h), a font rendering engine for Windows
- [**magicplan**](https://help.magicplan.app/acknowledgments), a mobile application for creating floor plans and interior designs using augmented reality
- [**Microsoft Office for Mac**](https://officecdnmac.microsoft.com/pr/legal/mac/OfficeforMacAttributions.html), a suite of productivity applications developed by Microsoft for macOS, including tools for word processing, spreadsheets, and presentations
- [**Microsoft Teams**](https://www.microsoft.com/microsoft-teams/), a team collaboration application offering workspace chat and video conferencing, file storage, and integration of proprietary and third-party applications and services
- [**MuseScore**](https://github.com/musescore/MuseScore), a free and open-source music notation and composition application
- [**NanaZip**](https://github.com/M2Team/NanaZip/blob/main/NanaZip.Codecs/NanaZip.Codecs.Archive.ElectronAsar.cpp), a 7-Zip derivative built for modern Windows
- [**Nexthink Infinity**](https://docs.nexthink.com/legal/services-terms/experience-open-source-software-licenses/infinity-2022.8-software-licenses), a digital employee experience management platform for monitoring and improving IT performance
- [**Sophos Connect Client**](https://docs.sophos.com/nsg/licenses/SophosConnect/SophosConnectAttribution.html), a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
- [**Stonebranch**](https://stonebranchdocs.atlassian.net/wiki/spaces/UA77/pages/799545647/Licenses+for+Third-Party+Libraries), a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
- [**Tablecruncher**](https://tablecruncher.com/), a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
- [**magicplan**](https://help.magicplan.app/acknowledgments), a mobile application for creating floor plans and interior designs using augmented reality
- [**VNote**](https://github.com/vnotex/vnote/blob/master/src/core/services/notebookcoreservice.cpp), a Markdown-based note-taking application written in C++
## Databases and Big Data
- [**ADIOS2**](https://code.ornl.gov/ecpcitest/adios2/-/tree/pr4285_FFSUpstream/thirdparty/nlohmann_json?ref_type=heads), a data management framework designed for high-performance input and output operations
- [**Apache Doris**](https://github.com/apache/doris/blob/master/be/src/runtime/be_proc_monitor.cpp), a real-time analytical database for high-concurrency queries
- [**Claris FileMaker Server**](https://www.claris.com/company/legal/docs/acknowledgements/filemaker-server-macwin/claris_fms2025_acknowledgements_en.pdf), the server platform hosting FileMaker custom apps and databases, developed by Apple subsidiary Claris
- [**ClickHouse**](https://github.com/ClickHouse/ClickHouse), a column-oriented database management system for real-time analytical queries
- [**Cribl Stream**](https://docs.cribl.io/stream/third-party-current-list/), a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
- [**DB Browser for SQLite**](https://github.com/sqlitebrowser/sqlitebrowser), a visual open-source tool for creating, designing, and editing SQLite database files
- [**Manticore Search**](https://github.com/manticoresoftware/manticoresearch/blob/main/src/searchdhttpcompat.cpp), a database for search, offering full-text and vector queries
- [**Milvus**](https://github.com/milvus-io/milvus/blob/master/internal/core/src/query/PlanImpl.h), a cloud-native vector database built for embedding similarity search
- [**MongoDB**](https://github.com/mongodb/mongo/blob/master/src/mongo/replay/config_handler.cpp), a general-purpose document database
- [**MySQL Connector/C++**](https://docs.oracle.com/cd/E17952_01/connector-cpp-9.1-license-com-en/license-opentelemetry-cpp-com.html), a C++ library for connecting and interacting with MySQL databases
- [**MySQL NDB Cluster**](https://downloads.mysql.com/docs/licenses/cluster-9.0-com-en.pdf), a distributed database system that provides high availability and scalability for MySQL databases
- [**MySQL Shell**](https://downloads.mysql.com/docs/licenses/mysql-shell-8.0-gpl-en.pdf), an advanced client and code editor for interacting with MySQL servers, supporting SQL, Python, and JavaScript
- [**PrestoDB**](https://github.com/prestodb/presto), a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
- [**PrestoDB**](https://github.com/prestodb/presto/blob/master/presto-native-execution/presto_cpp/main/Announcer.cpp), a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
- [**ROOT Data Analysis Framework**](https://root.cern/doc/v614/classnlohmann_1_1basic__json.html), an open-source data analysis framework widely used in high-energy physics and other fields for data processing and visualization
- [**Typesense**](https://github.com/typesense/typesense/blob/v31/include/join.h), an open source typo-tolerant search engine
- [**Vearch**](https://github.com/jd-opensource/vearch), a distributed vector database developed at JD.com for similarity search and retrieval-augmented generation
- [**WiredTiger**](https://github.com/wiredtiger/wiredtiger), a high-performance storage engine for databases, offering support for compression, concurrency, and checkpointing
## Simulation and Modeling
- [**Adobe Lagrange**](https://github.com/adobe/lagrange), a geometry processing library developed by Adobe for mesh manipulation and analysis
- [**Arcturus HoloSuite**](https://www.datocms-assets.com/104353/1698904597-holosuite-third-party-software-credits-and-attributions-2.pdf), a software toolset for capturing, editing, and streaming volumetric video, featuring advanced compression technologies for high-quality 3D content creation
- [**azul**](https://pure.tudelft.nl/ws/files/85338589/tgis.12673.pdf), a fast and efficient 3D city model viewer designed for visualizing urban environments and spatial data
- [**Bambu Studio**](https://github.com/bambulab/BambuStudio), a slicing and print management application for Bambu Lab 3D printers
- [**Blender**](https://projects.blender.org/blender/blender/search?q=nlohmann), a free and open-source 3D creation suite for modeling, animation, rendering, and more
- [**cpplot**](https://cpplot.readthedocs.io/en/latest/library_api/function_eigen_8h_1ac080eac0541014c5892a55e41bf785e6.html), a library for creating interactive graphs and charts in C++, which can be viewed in web browsers
- [**Foundry Nuke**](https://learn.foundry.com/nuke/content/misc/studio_third_party_libraries.html), a powerful node-based digital compositing and visual effects application used in film and television post-production
- [**FreeCAD**](https://github.com/FreeCAD/FreeCAD), a free and open-source parametric 3D CAD modeler for product design and engineering
- [**GAMS**](https://www.gams.com/47/docs/THIRDPARTY.html), a high-performance mathematical modeling system for optimization and decision support
- [**Keysight WirelessPro**](https://docs.keysight.com/display/engdocwirelesspro/WirelessPro+2026+Release+Notes), a simulation platform for 5G, 5G-Advanced, and 6G cellular network research
- [**Kitware SMTK**](https://github.com/Kitware/SMTK), a software toolkit for managing simulation models and workflows in scientific and engineering applications
- [**M-Star**](https://docs.mstarcfd.com/3_Licensing/thirdparty-licenses.html), a computational fluid dynamics software for simulating and analyzing fluid flow
- [**MapleSim CAD Toolbox**](https://www.maplesoft.com/support/help/MapleSim/view.aspx?path=CADToolbox/copyright), a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
- [**Microsoft AirSim**](https://github.com/microsoft/AirSim/blob/main/AirLib/include/common/Settings.hpp), a simulator for autonomous vehicles and drones built on Unreal Engine
- [**NVIDIA Omniverse**](https://docs.omniverse.nvidia.com/composer/latest/common/product-licenses/usd-explorer/usd-explorer-2023.2.0-licenses-manifest.html), a platform for 3D content creation and collaboration that enables real-time simulations and interactive experiences across various industries
- [**OpenSCAD**](https://github.com/openscad/openscad/blob/master/src/core/AIClient.cc), a script-driven solid 3D CAD modeller
- [**OrcaSlicer**](https://github.com/SoftFever/OrcaSlicer), an open-source slicer supporting a wide range of consumer 3D printers
- [**Pixar Renderman**](https://rmanwiki-26.pixar.com/space/REN26/19662083/Legal+Notice), a photorealistic 3D rendering software developed by Pixar, widely used in the film industry for creating high-quality visual effects and animations
- [**PrusaSlicer**](https://github.com/prusa3d/PrusaSlicer), the slicing software developed by Prusa Research for its 3D printers
- [**ROS - Robot Operating System**](http://docs.ros.org/en/noetic/api/behaviortree_cpp/html/json_8hpp_source.html), a set of software libraries and tools that assist in developing robot applications
- [**UBS**](https://www.ubs.com/), a multinational financial services and banking company
@@ -161,18 +278,31 @@ the result of an internet search. If you know further customers of the library,
- [**Acronis Cyber Protect Cloud**](https://care.acronis.com/s/article/59533-Third-party-software-used-in-Acronis-Cyber-Protect-Cloud?language=en_US), an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
- [**Baereos**](https://gitlab.tiger-computing.co.uk/packages/bareos/-/blob/tiger/bullseye/third-party/CLI11/examples/json.cpp), a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
- [**Bitdefender Home Scanner**](https://www.bitdefender.de/site/Main/view/home-scanner-open-source.html), a tool from Bitdefender that scans devices for malware and security threats, providing a safeguard against potential online dangers
- [**Cisco MLS++**](https://github.com/cisco/mlspp), an implementation of the Messaging Layer Security protocol for end-to-end encrypted group messaging
- [**Citrix Provisioning**](https://docs.citrix.com/en-us/provisioning/2203-ltsr/downloads/pvs-third-party-notices-2203.pdf), a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
- [**Citrix Virtual Apps and Desktops**](https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/2305/downloads/third-party-notices-apps-and-desktops.pdf), a solution from Citrix that delivers virtual apps and desktops
- [**Cyberarc**](https://docs.cyberark.com/Downloads/Legal/Privileged%20Session%20Manager%20for%20SSH%20Third-Party%20Notices.pdf), a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
- [**Deutsche Telekom sysrepo-plugins**](https://github.com/telekom/sysrepo-plugins), a collection of YANG datastore plugins used to manage network devices
- [**Egnyte Desktop**](https://helpdesk.egnyte.com/hc/en-us/articles/360007071732-Third-Party-Software-Acknowledgements), a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
- [**Elster**](https://www.secunet.com/en/about-us/press/article/elstersecure-bietet-komfortablen-login-ohne-passwort-dank-secunet-protect4use), a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
- [**Envoy**](https://github.com/envoyproxy/envoy), a cloud-native edge and service proxy that forms the data plane of many service meshes
- [**Ethereum Solidity**](https://github.com/ethereum/solidity), a high-level, object-oriented programming language designed for implementing smart contracts on the Ethereum platform
- [**gVisor**](https://github.com/google/gvisor), an application kernel that provides a secure sandbox for running untrusted containers
- [**IBM Storage Virtualize**](https://public.dhe.ibm.com/systems/support/warranty/pdfs/stgoilc/SV_for_FS_7300_v8_7_0_Base_OILC.pdf), the software powering IBM FlashSystem enterprise storage arrays
- [**Inciga**](https://fossies.org/linux/icinga2/third-party/nlohmann_json/json.hpp), a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
- [**Intel Accelerator Management Daemon for VMware ESXi**](https://downloadmirror.intel.com/772507/THIRD-PARTY.txt), a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
- [**Juniper Identity Management Service**](https://www.juniper.net/documentation/us/en/software/jims/jims-guide/jims-guide.pdf)
- [**Meta FBOSS**](https://github.com/facebook/fboss), the software stack that controls the network switches in Meta's data centers
- [**Microsoft Azure IoT SDK**](https://library.e.abb.com/public/2779c5f85f30484192eb3cb3f666a201/IP%20Gateway%20Open%20License%20Declaration_9AKK108467A4095_Rev_C.pdf), a collection of tools and libraries to help developers connect, build, and deploy Internet of Things (IoT) solutions on the Azure cloud platform
- [**Microsoft Confidential Consortium Framework**](https://github.com/microsoft/CCF), a framework for building secure, highly available applications on trusted execution environments
- [**Microsoft WinGet**](https://github.com/microsoft/winget-cli), a command-line utility included in the Windows Package Manager
- [**Mitsubishi Electric SECS/GEM**](https://dl.mitsubishielectric.com/dl/fa/document/manual/plc/sh082483eng/sh082483engi.pdf), the semiconductor equipment communication software running on Mitsubishi Electric C Controller and C intelligent function modules
- [**Moxa**](https://www.moxa.com/getmedia/fbe2a0c7-8dda-4b5b-a501-15e45adebb1f/moxa-foss-statement-for-da-720-series-win-10-ltsc-21h2-declaration-v1.0.pdf), a provider of industrial networking, computing, and automation infrastructure
- [**plexusAV**](https://www.sisme.com/media/10994/manual_plexusav-p-avn-4-form8244-c.pdf), a high-performance AV-over-IP transceiver device capable of video encoding and decoding using the IPMX standard
- [**Pointr**](https://docs-dev.pointr.tech/docs/8.x/Developer%20Portal/Open%20Source%20Licenses/), a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
- [**secunet protect4use**](https://www.secunet.com/en/about-us/press/article/elstersecure-bietet-komfortablen-login-ohne-passwort-dank-secunet-protect4use), a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
- [**Sencore MRD 7000**](https://www.foccusdigital.com/wp-content/uploads/2025/03/MRD-7000-Manual-8175V.pdf), a professional multi-channel receiver and decoder supporting UHD and HD stream decoding
- [**Siemens SINEC**](https://cache.industry.siemens.com/dl/files/917/109974917/att_1298783/v2/OSS_SINEC-NMS_99.pdf), a family of network management and infrastructure services for industrial networks
- [**Toshiba Industrial Servers**](https://www.global.toshiba/content/dam/toshiba/jp/products-solutions/industrial/computer/product/server/fs20000r/pdf/FS20000R_OSS_License_6E8C5817_rev0.pdf), the FS20000R series of industrial servers for factory automation and control systems
- [**Wazuh**](https://github.com/wazuh/wazuh/blob/main/src/data_provider/src/sysInfo.cpp), a security platform for threat detection, integrity monitoring and incident response
- [**ZeroTier**](https://github.com/zerotier/ZeroTierOne/blob/dev/osdep/OSUtils.hpp), a software-defined networking service that creates virtual Ethernet networks
+93 -5
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@@ -291,9 +291,10 @@ A JSON Pointer array index must be a number.
### json.exception.parse_error.110
When parsing CBOR or MessagePack, the byte vector ends before the complete value has been read.
When parsing a [binary format](../features/binary_formats/index.md), the byte vector ends before the complete value has
been read.
!!! failure "Example message"
!!! failure "Example messages"
```
[json.exception.parse_error.110] parse error at byte 5: syntax error while parsing CBOR string: unexpected end of input
@@ -301,6 +302,9 @@ When parsing CBOR or MessagePack, the byte vector ends before the complete value
```
[json.exception.parse_error.110] parse error at byte 2: syntax error while parsing UBJSON value: expected end of input; last byte: 0x5A
```
```
[json.exception.parse_error.110] parse error at byte 8: syntax error while parsing BSON number: unexpected end of input
```
### json.exception.parse_error.112
@@ -329,10 +333,14 @@ An unexpected byte was read in a [binary format](../features/binary_formats/inde
```
[json.exception.parse_error.112] parse error at byte 9: syntax error while parsing CBOR value: negative integer overflow
```
```
[json.exception.parse_error.112] parse error at byte 5: syntax error while parsing BSON document: document size 6 does not match the number of bytes read (5)
```
### json.exception.parse_error.113
While parsing a map key, a value that is not a string has been read.
A string could not be read from a [binary format](../features/binary_formats/index.md): either a value that is not a
string was read where one was required (for instance as a map key), or the string's length specification is invalid.
!!! failure "Example messages"
@@ -345,6 +353,9 @@ While parsing a map key, a value that is not a string has been read.
```
[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing UBJSON char: byte after 'C' must be in range 0x00..0x7F; last byte: 0x82
```
```
[json.exception.parse_error.113] parse error at byte 3: syntax error while parsing BJData string: string length must not be negative
```
### json.exception.parse_error.114
@@ -853,13 +864,30 @@ and this exception no longer occurs.
### json.exception.out_of_range.408
The size (following `#`) of an UBJSON array or object exceeds the maximal capacity.
The size of an array or object in a [binary format](../features/binary_formats/index.md) exceeds the maximal capacity:
the size following `#` for [UBJSON](../features/binary_formats/ubjson.md)/[BJData](../features/binary_formats/bjdata.md),
or the encoded length for [CBOR](../features/binary_formats/cbor.md).
!!! failure "Example message"
The exception is also thrown for a [UBJSON](../features/binary_formats/ubjson.md) array of a type that is encoded by its
marker alone (`Z`, `T` or `F`) whose declared count exceeds 1,048,576 (`1 << 20`). 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.
[`to_ubjson`](../api/basic_json/to_ubjson.md) writes longer arrays of these types without the size and type annotation,
so any value it produces can still be read back.
!!! failure "Example messages"
```
excessive array size: 8658170730974374167
```
```
[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive array size
```
```
[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive map size
```
```
[json.exception.out_of_range.408] syntax error while parsing UBJSON size: excessive array size
```
### json.exception.out_of_range.409
@@ -898,6 +926,50 @@ A JSON Patch `add` operation cannot be applied because the target location's par
This exception was added in version 3.13.0. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.
### json.exception.out_of_range.412
BSON stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer. This exception is thrown when a value is too large to be described by such a length field.
!!! failure "Example message"
```
BSON length 2147483661 exceeds maximum of 2147483647
```
!!! note
This exception was added in version 3.13.0. Before that, the length was silently truncated, and
[`to_bson`](../api/basic_json/to_bson.md) produced documents with negative length prefixes that
[`from_bson`](../api/basic_json/from_bson.md) rejected.
### json.exception.out_of_range.413
A JSON Patch `remove` operation cannot be applied because the target location's parent is neither an object nor an array. Per [RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902), a `remove` target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) or `null` has no members or elements to remove.
!!! failure "Example message"
```
cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
```
!!! note
This exception was added in version 3.13.0. Before that, this situation was silently ignored (the `remove` operation had no effect).
### json.exception.out_of_range.414
A JSON Patch `move` operation's `"from"` location is a proper prefix of its `"path"` location. Per [RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902) (section 4.4), a location cannot be moved into one of its own children.
!!! failure "Example message"
```
cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
```
!!! note
This exception was added in version 3.13.0. 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.
## Further exceptions
This exception is thrown in case of errors that cannot be classified with the
@@ -930,3 +1002,19 @@ A JSON Patch operation 'test' failed. The unsuccessful operation is also printed
```
[json.exception.other_error.501] unsuccessful: {"op":"test","path":"/baz","value":"bar"}
```
### json.exception.other_error.502
[`to_ubjson`](../api/basic_json/to_ubjson.md) and [`to_bjdata`](../api/basic_json/to_bjdata.md) were called with
`use_type = true` but `use_size = false`. UBJSON requires a size marker (`#`) after a type marker (`$`).
!!! failure "Example message"
```
[json.exception.other_error.502] use_type requires use_size = true
```
!!! note
This exception was added in version 3.13.0. Before that, debug builds aborted on an assertion and release builds
wrote a `$` marker without `#`, which [`from_ubjson`](../api/basic_json/from_ubjson.md) then rejected.
+21
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@@ -194,6 +194,27 @@ The library uses `std::numeric_limits<number_float_t>::digits10` (15 for IEEE `d
See [this section](../features/types/number_handling.md#number-serialization) on the library's number handling for more information.
### Serializing untrusted or invalid UTF-8
!!! question "Questions"
- Why does `dump()` throw when I serialize data that came from the network?
- Is CVE-2024-34363 a vulnerability in this library?
Crashes reported against this library that stem from an uncaught
[`type_error.316`](exceptions.md#jsonexceptiontype_error316) while serializing unvalidated input (e.g.,
CVE-2024-34363) are a usage issue, not a library vulnerability:
[`dump()`](../api/basic_json/dump.md) throws in its default `strict` mode because
[RFC 8259](https://datatracker.ietf.org/doc/html/rfc8259#section-8.1) requires JSON text to be valid UTF-8.
The recommended pattern is to pass a non-strict [`error_handler`](../api/basic_json/error_handler_t.md) or to handle the
exception:
```cpp
// replace invalid sequences with U+FFFD instead of throwing
const auto s = j.dump(-1, ' ', false, json::error_handler_t::replace);
```
### Using JSON values with `std::format` or `fmt`
!!! question
-1
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@@ -14,6 +14,5 @@ You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nl
- [Steve Sperandeo](https://github.com/homer6)
- [Robert Jefe Lindstädt](https://github.com/eljefedelrodeodeljefe)
- [Steve Wagner](https://github.com/ciroque)
- [Lion Yang](https://github.com/LionNatsu)
Thanks everyone!
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@@ -135,6 +135,31 @@ Enable CI build targets. The exact targets are used during the several CI steps
Enable [extended diagnostic messages](../home/exceptions.md#extended-diagnostic-messages) by defining macro [`JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md). This option is `OFF` by default.
!!! warning "Does not apply to a pre-installed package"
This option only takes effect when building nlohmann/json from source as part of your own
CMake project (e.g. via [`FetchContent`](#fetchcontent) or [`add_subdirectory`](#external)).
It has **no effect** on a package that was already built and installed elsewhere (Homebrew,
vcpkg, a system package, etc.) — the resulting compile definition is baked into the exported
`nlohmann_jsonTargets.cmake` at install time, and `set(JSON_Diagnostics ON)` before
`find_package()` does not change it (verified against the Homebrew-installed package: the
exported target still carries a fixed `$<$<BOOL:OFF>:JSON_DIAGNOSTICS=1>`, regardless of any
variable set in the consuming project).
To enable extended diagnostics for a pre-installed package, override the imported target's
property directly after `find_package()`:
```cmake
find_package(nlohmann_json REQUIRED)
set_target_properties(nlohmann_json::nlohmann_json PROPERTIES
INTERFACE_COMPILE_DEFINITIONS "JSON_DIAGNOSTICS=1")
```
This only works cleanly when your project is the sole consumer of that imported target. If
nlohmann_json is pulled in from more than one place in your dependency graph with different
`JSON_DIAGNOSTICS` values, you may see a `"JSON_DIAGNOSTICS" redefined` compiler error, since
conflicting `-D` flags can end up on the same compile command line.
### `JSON_Diagnostic_Positions`
Enable position diagnostics by defining macro [`JSON_DIAGNOSTIC_POSITIONS`](../api/macros/json_diagnostic_positions.md). This option is `OFF` by default.
@@ -930,6 +930,12 @@ If you are using [CocoaPods](https://cocoapods.org), you can use the library by
to your podfile (see [an example](https://bitbucket.org/benman/nlohmann_json-cocoapod/src/master/)). Please file issues
[here](https://bitbucket.org/benman/nlohmann_json-cocoapod/issues?status=new&status=open).
## npm
This project does not publish an official [npm](https://www.npmjs.com) package. The npm package
[`nlohmann-json`](https://www.npmjs.com/package/nlohmann-json) (or similarly named packages) is not maintained or
endorsed by this project. Use one of the package managers listed above, or integrate the single header directly.
## ESP-IDF and PlatformIO
There is no official package published to the [ESP-IDF Component Registry](https://components.espressif.com) or the
+10 -1
View File
@@ -325,6 +325,7 @@ nav:
- 'JSON_USE_GLOBAL_UDLS': api/macros/json_use_global_udls.md
- 'JSON_USE_IMPLICIT_CONVERSIONS': api/macros/json_use_implicit_conversions.md
- 'JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON': api/macros/json_use_legacy_discarded_value_comparison.md
- 'JSON_USE_SIMDUTF': api/macros/json_use_simdutf.md
- 'NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE': api/macros/nlohmann_define_derived_type.md
- 'NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE': api/macros/nlohmann_define_type_intrusive.md
- 'NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE': api/macros/nlohmann_define_type_non_intrusive.md
@@ -337,6 +338,7 @@ nav:
- 'NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH': api/macros/nlohmann_json_version_major.md
- Community:
- community/index.md
- community/ecosystem.md
- "Code of Conduct": community/code_of_conduct.md
- community/contribution_guidelines.md
- community/quality_assurance.md
@@ -421,7 +423,14 @@ plugins:
- http://nlohmann.github.io/json/*
- https://nlohmann.github.io/json/*
- mailto:*
- privacy
- privacy:
# repology.org refuses requests from GitHub Actions runners, which made
# the privacy plugin abort the whole build when it could not download the
# package badges (the fetch fails, then reading the missing cache entry
# raises FileNotFoundError). Readers' browsers are served normally, so
# leave these badges as external references instead of self-hosting them.
assets_exclude:
- repology.org/*
- llmstxt:
markdown_description: >
JSON for Modern C++ is a C++11 header-only library implementing a JSON
+3 -3
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@@ -1,8 +1,8 @@
wheel==0.47.0
wheel==0.48.0
mkdocs==1.6.1 # documentation framework
mkdocs-git-revision-date-localized-plugin==1.5.3 # plugin "git-revision-date-localized"
mkdocs-material==9.7.6 # theme for mkdocs
mkdocs-git-revision-date-localized-plugin==1.5.4 # plugin "git-revision-date-localized"
mkdocs-material==9.7.7 # theme for mkdocs
mkdocs-material-extensions==1.3.1 # extensions
mkdocs-minify-plugin==0.8.0 # plugin "minify"
mkdocs-redirects==1.2.3 # plugin "redirects"