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<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span>
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/" rel="canonical"><link href=home/license/ rel=next><link rel=icon href=assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>JSON for Modern C++ - JSON for Modern C++</title><link rel=stylesheet href=assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=assets/stylesheets/palette.ab4e12ef.min.css><link rel=stylesheet href=css/custom.css><link rel=stylesheet href=css/brand.css><link rel=stylesheet href=css/fig-sax.css><link rel=stylesheet href=css/fig-jsonview.css><link rel=stylesheet href=css/fig-exceptions.css><link rel=stylesheet href=css/fig-pointer.css><link rel=stylesheet 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</form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 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<span class=nj-k>#include</span> <span class=nj-s>&lt;nlohmann/json.hpp&gt;</span>
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
<span class=nj-k>using</span> json = nlohmann::json;
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
<span class=p>{</span>
<span class=w> </span><span class=c1>// parse a JSON string</span>
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>{"happy": true, "pi": 3.141}</span><span class=dl>)</span><span class=s>"</span><span class=p>);</span>
<span class=nj-k>int</span> main()
{
json j = json::parse(<span class=nj-s>R"({"happy": true})"</span>);
j[<span class=nj-s>"pi"</span>] = <span class=nj-n>3.141</span>;
j[<span class=nj-s>"list"</span>] = {<span class=nj-n>1</span>, <span class=nj-n>0</span>, <span class=nj-n>2</span>};
<span class=w> </span><span class=c1>// access and modify values</span>
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"name"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"Niels"</span><span class=p>;</span>
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"list"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>0</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>};</span>
<span class=w> </span><span class=c1>// read a value into a C++ variable and use it</span>
<span class=w> </span><span class=kt>double</span><span class=w> </span><span class=n>pi</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"pi"</span><span class=p>].</span><span class=n>get</span><span class=o>&lt;</span><span class=kt>double</span><span class=o>&gt;</span><span class=p>();</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=s>"2 * pi = "</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=mi>2</span><span class=w> </span><span class=o>*</span><span class=w> </span><span class=n>pi</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=w> </span><span class=c1>// serialize with an indent of 4 spaces</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>j</span><span class=p>.</span><span class=n>dump</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=p>}</span>
</code></pre></div> <p>Get the library by copying the single header <a href="https://github.com/nlohmann/json/releases"><code>json.hpp</code></a> from the releases page into a directory <code>nlohmann</code> on your include path, or by installing it with a package manager:</p> <div class=highlight><pre><span></span><code>brew<span class=w> </span>install<span class=w> </span>nlohmann-json<span class=w> </span><span class=c1># Homebrew</span>
vcpkg<span class=w> </span>install<span class=w> </span>nlohmann-json<span class=w> </span><span class=c1># vcpkg</span>
</code></pre></div> <div class=highlight><pre><span></span><code><span class=nb>find_package</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=w> </span><span class=s>3.12.0</span><span class=w> </span><span class=s>REQUIRED</span><span class=p>)</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>myproject</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json::nlohmann_json</span><span class=p>)</span>
</code></pre></div> <p>See <a href=integration/ >Integration</a> for CMake in detail, all supported package managers (Conan, Meson, Bazel, Conda, and more), and pkg-config.</p> <h2 id=explore-the-documentation>Explore the documentation<a class=headerlink href=#explore-the-documentation title="Permanent link">&para;</a></h2> <div class="grid cards"> <ul> <li> <p><span class="twemoji lg middle"><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20.322.75h1.176a1.75 1.75 0 0 1 1.75 1.749v1.177a10.75 10.75 0 0 1-2.925 7.374l-1.228 1.304a24 24 0 0 1-1.596 1.542v5.038c0 .615-.323 1.184-.85 1.5l-4.514 2.709a.75.75 0 0 1-1.12-.488l-.963-4.572a1.3 1.3 0 0 1-.14-.129L8.04 15.96l-1.994-1.873a1.3 1.3 0 0 1-.129-.14l-4.571-.963a.75.75 0 0 1-.49-1.12l2.71-4.514c.316-.527.885-.85 1.5-.85h5.037a24 24 0 0 1 1.542-1.594l1.304-1.23A10.75 10.75 0 0 1 20.321.75Zm-6.344 4.018v-.001l-1.304 1.23a22.3 22.3 0 0 0-3.255 3.851l-2.193 3.29 1.859 1.744.034.034 1.743 1.858 3.288-2.192a22.3 22.3 0 0 0 3.854-3.257l1.228-1.303a9.25 9.25 0 0 0 2.517-6.346V2.5a.25.25 0 0 0-.25-.25h-1.177a9.25 9.25 0 0 0-6.344 2.518M6.5 21c-1.209 1.209-3.901 1.445-4.743 1.49a.24.24 0 0 1-.18-.067.24.24 0 0 1-.067-.18c.045-.842.281-3.534 1.49-4.743.9-.9 2.6-.9 3.5 0s.9 2.6 0 3.5m-.592-8.588L8.17 9.017q.346-.519.717-1.017H5.066a.25.25 0 0 0-.214.121l-2.167 3.612ZM16 15.112q-.5.372-1.018.718l-3.393 2.262.678 3.223 3.612-2.167a.25.25 0 0 0 .121-.214ZM17.5 8a1.5 1.5 0 1 1-3.001-.001A1.5 1.5 0 0 1 17.5 8"/></svg></span> <strong>Features</strong></p> <hr> <p>Creating, parsing, accessing, and serializing <abbr title="JavaScript Object Notation">JSON</abbr> values, <abbr title="JavaScript Object Notation">JSON</abbr> Pointer/Patch, binary formats, zero-copy views, and more.</p> <p><a href=features/ ><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13.22 19.03a.75.75 0 0 1 0-1.06L18.19 13H3.75a.75.75 0 0 1 0-1.5h14.44l-4.97-4.97a.749.749 0 0 1 .326-1.275.75.75 0 0 1 .734.215l6.25 6.25a.75.75 0 0 1 0 1.06l-6.25 6.25a.75.75 0 0 1-1.06 0"/></svg></span> Features</a></p> </li> <li> <p><span class="twemoji lg middle"><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12.876.64V.639l8.25 4.763c.541.313.875.89.875 1.515v9.525a1.75 1.75 0 0 1-.875 1.516l-8.25 4.762a1.75 1.75 0 0 1-1.75 0l-8.25-4.763a1.75 1.75 0 0 1-.875-1.515V6.917c0-.625.334-1.202.875-1.515L11.126.64a1.75 1.75 0 0 1 1.75 0m-1 1.298L4.251 6.34l7.75 4.474 7.75-4.474-7.625-4.402a.25.25 0 0 0-.25 0m.875 19.123 7.625-4.402a.25.25 0 0 0 .125-.216V7.639l-7.75 4.474ZM3.501 7.64v8.803c0 .09.048.172.125.216l7.625 4.402v-8.947Z"/></svg></span> <strong>Integration</strong></p> <hr> <p>Add the library to your project via a single header, CMake, a package manager, or pkg-config.</p> <p><a href=integration/ ><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13.22 19.03a.75.75 0 0 1 0-1.06L18.19 13H3.75a.75.75 0 0 1 0-1.5h14.44l-4.97-4.97a.749.749 0 0 1 .326-1.275.75.75 0 0 1 .734.215l6.25 6.25a.75.75 0 0 1 0 1.06l-6.25 6.25a.75.75 0 0 1-1.06 0"/></svg></span> Integration</a></p> </li> <li> <p><span class="twemoji lg middle"><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M0 3.75A.75.75 0 0 1 .75 3h7.497c1.566 0 2.945.8 3.751 2.014A4.5 4.5 0 0 1 15.75 3h7.5a.75.75 0 0 1 .75.75v15.063a.75.75 0 0 1-.755.75l-7.682-.052a3 3 0 0 0-2.142.878l-.89.891a.75.75 0 0 1-1.061 0l-.902-.901a3 3 0 0 0-2.121-.879H.75a.75.75 0 0 1-.75-.75Zm12.75 15.232a4.5 4.5 0 0 1 2.823-.971l6.927.047V4.5h-6.75a3 3 0 0 0-3 3ZM11.247 7.497a3 3 0 0 0-3-2.997H1.5V18h6.947c1.018 0 2.006.346 2.803.98Z"/></svg></span> <strong><abbr title="Application Programming Interface">API</abbr> documentation</strong></p> <hr> <p>The complete reference for <code>basic_json</code> and its member functions, types, and related classes, as well as for <code>json_document</code> and <code>json_view</code>.</p> <p><a href=api/basic_json/ ><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13.22 19.03a.75.75 0 0 1 0-1.06L18.19 13H3.75a.75.75 0 0 1 0-1.5h14.44l-4.97-4.97a.749.749 0 0 1 .326-1.275.75.75 0 0 1 .734.215l6.25 6.25a.75.75 0 0 1 0 1.06l-6.25 6.25a.75.75 0 0 1-1.06 0"/></svg></span> <abbr title="Application Programming Interface">API</abbr> documentation</a></p> </li> <li> <p><span class="twemoji lg middle"><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M10.97 8.265a1.45 1.45 0 0 0-.487.57.75.75 0 0 1-1.341-.67c.2-.402.513-.826.997-1.148C10.627 6.69 11.244 6.5 12 6.5c.658 0 1.369.195 1.934.619a2.45 2.45 0 0 1 1.004 2.006c0 1.033-.513 1.72-1.027 2.215-.19.183-.399.358-.579.508l-.147.123a4 4 0 0 0-.435.409v1.37a.75.75 0 1 1-1.5 0v-1.473c0-.237.067-.504.247-.736.22-.28.486-.517.718-.714l.183-.153.001-.001c.172-.143.324-.27.47-.412.368-.355.569-.676.569-1.136a.95.95 0 0 0-.404-.806C12.766 8.118 12.384 8 12 8c-.494 0-.814.121-1.03.265M13 17a1 1 0 1 1-2 0 1 1 0 0 1 2 0"/><path d="M12 1c6.075 0 1Line truncated
std::cout &lt;&lt; j.dump(<span class=nj-n>4</span>) &lt;&lt; <span class=nj-s>"\n"</span>;
}</code></pre> </div> </div> </section> <main class=md-main data-md-component=main> <div class="md-main__inner md-grid"> <div class="md-sidebar md-sidebar--primary" data-md-component=sidebar data-md-type=navigation> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--primary md-nav--lifted" aria-label=Navigation data-md-level=0> <label class=md-nav__title for=__drawer> <a href=. title="JSON for Modern C++" class="md-nav__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <img src=images/wordmark-header.svg alt=logo> </a> JSON for Modern C++ </label> <div class=md-nav__source> <a href="https://github.com/nlohmann/json" title="Go to repository" class="md-source" data-md-component="source"> <div class="md-source__icon md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: 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