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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href=https://json.nlohmann.me/home/customers/ rel=canonical><link href=../design_goals/ rel=prev><link href=../sponsors/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.5.48"><title>Customers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.6f8fc17f.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#customers class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Customers </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href=https://json.nlohmann.me/home/customers/ rel=canonical><link href=../design_goals/ rel=prev><link href=../sponsors/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.5.48"><title>Customers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.6f8fc17f.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#customers class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Customers </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 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search/search_index.json
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{"config":{"lang":["en"],"separator":"[\\s\\-\\.]","pipeline":["stopWordFilter"]},"docs":[{"location":"","title":"JSON for Modern C++","text":""},{"location":"api/json/","title":"nlohmann::json","text":"<pre><code>using json = basic_json&lt;&gt;;\n</code></pre> <p>This type is the default specialization of the basic_json class which uses the standard template types.</p>"},{"location":"api/json/#examples","title":"Examples","text":"Example <p>The example below demonstrates how to use the type <code>nlohmann::json</code>.</p> <pre><code>#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n#include &lt;nlohmann/json.hpp&gt;\n\nusing json = nlohmann::json;\n\nint main()\n{\n // create a JSON object\n json j =\n {\n {\"pi\", 3.141},\n {\"happy\", true},\n {\"name\", \"Niels\"},\n {\"nothing\", nullptr},\n {\n \"answer\", {\n {\"everything\", 42}\n }\n },\n {\"list\", {1, 0, 2}},\n {\n \"object\", {\n {\"currency\", \"USD\"},\n {\"value\", 42.99}\n }\n }\n };\n\n // add new values\n j[\"new\"][\"key\"][\"value\"] = {\"another\", \"list\"};\n\n // count elements\n auto s = j.size();\n j[\"size\"] = s;\n\n // pretty print with indent of 4 spaces\n std::cout &lt;&lt; std::setw(4) &lt;&lt; j &lt;&lt; '\\n';\n}\n</code></pre> <p>Output:</p> <pre><code>{\n \"answer\": {\n \"everything\": 42\n },\n \"happy\": true,\n \"list\": [\n 1,\n 0,\n 2\n ],\n \"name\": \"Niels\",\n \"new\": {\n \"key\": {\n \"value\": [\n \"another\",\n \"list\"\n ]\n }\n },\n \"nothing\": null,\n \"object\": {\n \"currency\": \"USD\",\n \"value\": 42.99\n },\n \"pi\": 3.141,\n \"size\": 8\n}\n</code></pre>"},{"location":"api/json/#version-history","title":"Version history","text":"<p>Since version 1.0.0.</p>"},{"location":"api/operator_gtgt/","title":"nlohmann::operator&gt;&gt;(basic_json)","text":"<pre><code>std::istream&amp; operator&gt;&gt;(std::istream&amp; i, basic_json&amp; j);\n</code></pre> <p>Deserializes an input stream to a JSON value.</p>"},{"location":"api/operator_gtgt/#parameters","title":"Parameters","text":"<code>i</code> (in, out) input stream to read a serialized JSON value from <code>j</code> (in, out) JSON value to write the deserialized input to"},{"location":"api/operator_gtgt/#return-value","title":"Return value","text":"<p>the stream <code>i</code></p>"},{"location":"api/operator_gtgt/#exceptions","title":"Exceptions","text":"<ul> <li>Throws <code>parse_error.101</code> in case of an unexpected token.</li> <li>Throws <code>parse_error.102</code> if to_unicode fails or surrogate error.</li> <li>Throws <code>parse_error.103</code> if to_unicode fails.</li> </ul>"},{"location":"api/operator_gtgt/#complexity","title":"Complexity","text":"<p>Linear in the length of the input. The parser is a predictive LL(1) parser.</p>"},{"location":"api/operator_gtgt/#notes","title":"Notes","text":"<p>A UTF-8 byte order mark is silently ignored.</p> <p>Deprecation</p> <p>This function replaces function <code>std::istream&amp; operator&lt;&lt;(basic_json&amp; j, std::istream&amp; i)</code> which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like <code>j &lt;&lt; i;</code> with <code>i &gt;&gt; j;</code>.</p>"},{"location":"api/operator_gtgt/#examples","title":"Examples","text":"Example <p>The example below shows how a JSON value is constructed by reading a serialization from a stream.</p> <pre><code>#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n#include &lt;sstream&gt;\n#include &lt;nlohmann/json.hpp&gt;\n\nusing json = nlohmann::json;\n\nint main()\n{\n // create stream with serialized JSON\n std::stringstream ss;\n ss &lt;&lt; R\"({\n \"number\": 23,\n \"string\": \"Hello, world!\",\n \"array\": [1, 2, 3, 4, 5],\n \"boolean\": false,\n \"null\": null\n })\";\n\n // create JSON value and read the serialization from the stream\n json j;\n ss &gt;&gt; j;\n\n // serialize JSON\n std::cout &lt;&lt; std::setw(2) &lt;&lt; j &lt;&lt; '\\n';\n}\n</code></pre> <p>Output:</p> <pre><code>{\n \"array\": [\n 1,\n 2,\n 3,\n 4,\n 5\n ],\n \"boolean\": false,\n \"null\": null,\n \"number\": 23,\n \"string\": \"Hello, world!\"\n}\n</code></pre>"},{"location":"api/operator_gtgt/#see-also","title":"See also","text":"<ul> <li>accept - check if the input is valid JSON</li> <li>parse - deserialize from a compatible input</li> </ul>"},{"location":"api/operator_gtgt/#version-history","title":"Version history","text":"<ul> <li>Added in version 1.0.0. Deprecated in version 3.0.0.</li> </ul>"},{"location":"api/operator_literal_json/","title":"nlohmann::operator\"\"_json","text":"<pre><code>json operatorLine truncated
{"config":{"lang":["en"],"separator":"[\\s\\-\\.]","pipeline":["stopWordFilter"]},"docs":[{"location":"","title":"JSON for Modern C++","text":""},{"location":"api/json/","title":"nlohmann::json","text":"<pre><code>using json = basic_json&lt;&gt;;\n</code></pre> <p>This type is the default specialization of the basic_json class which uses the standard template types.</p>"},{"location":"api/json/#examples","title":"Examples","text":"Example <p>The example below demonstrates how to use the type <code>nlohmann::json</code>.</p> <pre><code>#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n#include &lt;nlohmann/json.hpp&gt;\n\nusing json = nlohmann::json;\n\nint main()\n{\n // create a JSON object\n json j =\n {\n {\"pi\", 3.141},\n {\"happy\", true},\n {\"name\", \"Niels\"},\n {\"nothing\", nullptr},\n {\n \"answer\", {\n {\"everything\", 42}\n }\n },\n {\"list\", {1, 0, 2}},\n {\n \"object\", {\n {\"currency\", \"USD\"},\n {\"value\", 42.99}\n }\n }\n };\n\n // add new values\n j[\"new\"][\"key\"][\"value\"] = {\"another\", \"list\"};\n\n // count elements\n auto s = j.size();\n j[\"size\"] = s;\n\n // pretty print with indent of 4 spaces\n std::cout &lt;&lt; std::setw(4) &lt;&lt; j &lt;&lt; '\\n';\n}\n</code></pre> <p>Output:</p> <pre><code>{\n \"answer\": {\n \"everything\": 42\n },\n \"happy\": true,\n \"list\": [\n 1,\n 0,\n 2\n ],\n \"name\": \"Niels\",\n \"new\": {\n \"key\": {\n \"value\": [\n \"another\",\n \"list\"\n ]\n }\n },\n \"nothing\": null,\n \"object\": {\n \"currency\": \"USD\",\n \"value\": 42.99\n },\n \"pi\": 3.141,\n \"size\": 8\n}\n</code></pre>"},{"location":"api/json/#version-history","title":"Version history","text":"<p>Since version 1.0.0.</p>"},{"location":"api/operator_gtgt/","title":"nlohmann::operator&gt;&gt;(basic_json)","text":"<pre><code>std::istream&amp; operator&gt;&gt;(std::istream&amp; i, basic_json&amp; j);\n</code></pre> <p>Deserializes an input stream to a JSON value.</p>"},{"location":"api/operator_gtgt/#parameters","title":"Parameters","text":"<code>i</code> (in, out) input stream to read a serialized JSON value from <code>j</code> (in, out) JSON value to write the deserialized input to"},{"location":"api/operator_gtgt/#return-value","title":"Return value","text":"<p>the stream <code>i</code></p>"},{"location":"api/operator_gtgt/#exceptions","title":"Exceptions","text":"<ul> <li>Throws <code>parse_error.101</code> in case of an unexpected token.</li> <li>Throws <code>parse_error.102</code> if to_unicode fails or surrogate error.</li> <li>Throws <code>parse_error.103</code> if to_unicode fails.</li> </ul>"},{"location":"api/operator_gtgt/#complexity","title":"Complexity","text":"<p>Linear in the length of the input. The parser is a predictive LL(1) parser.</p>"},{"location":"api/operator_gtgt/#notes","title":"Notes","text":"<p>A UTF-8 byte order mark is silently ignored.</p> <p>Deprecation</p> <p>This function replaces function <code>std::istream&amp; operator&lt;&lt;(basic_json&amp; j, std::istream&amp; i)</code> which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like <code>j &lt;&lt; i;</code> with <code>i &gt;&gt; j;</code>.</p>"},{"location":"api/operator_gtgt/#examples","title":"Examples","text":"Example <p>The example below shows how a JSON value is constructed by reading a serialization from a stream.</p> <pre><code>#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n#include &lt;sstream&gt;\n#include &lt;nlohmann/json.hpp&gt;\n\nusing json = nlohmann::json;\n\nint main()\n{\n // create stream with serialized JSON\n std::stringstream ss;\n ss &lt;&lt; R\"({\n \"number\": 23,\n \"string\": \"Hello, world!\",\n \"array\": [1, 2, 3, 4, 5],\n \"boolean\": false,\n \"null\": null\n })\";\n\n // create JSON value and read the serialization from the stream\n json j;\n ss &gt;&gt; j;\n\n // serialize JSON\n std::cout &lt;&lt; std::setw(2) &lt;&lt; j &lt;&lt; '\\n';\n}\n</code></pre> <p>Output:</p> <pre><code>{\n \"array\": [\n 1,\n 2,\n 3,\n 4,\n 5\n ],\n \"boolean\": false,\n \"null\": null,\n \"number\": 23,\n \"string\": \"Hello, world!\"\n}\n</code></pre>"},{"location":"api/operator_gtgt/#see-also","title":"See also","text":"<ul> <li>accept - check if the input is valid JSON</li> <li>parse - deserialize from a compatible input</li> </ul>"},{"location":"api/operator_gtgt/#version-history","title":"Version history","text":"<ul> <li>Added in version 1.0.0. Deprecated in version 3.0.0.</li> </ul>"},{"location":"api/operator_literal_json/","title":"nlohmann::operator\"\"_json","text":"<pre><code>json operatorLine truncated