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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>serde_json</a>::<wbr><a class="macro" href=''>json</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">json</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">json</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=&gt;</span> { ... };
}</pre>
<div class='docblock'><p>Construct a <code>serde_json::Value</code> from a JSON literal.</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>({
<span class="string">&quot;code&quot;</span>: <span class="number">200</span>,
<span class="string">&quot;success&quot;</span>: <span class="bool-val">true</span>,
<span class="string">&quot;payload&quot;</span>: {
<span class="string">&quot;features&quot;</span>: [
<span class="string">&quot;serde&quot;</span>,
<span class="string">&quot;json&quot;</span>
]
}
});</pre>
<p>Variables or expressions can be interpolated into the JSON literal. Any type
interpolated into an array element or object value must implement Serde's
<code>Serialize</code> trait, while any type interpolated into a object key must
implement <code>Into&lt;String&gt;</code>. If the <code>Serialize</code> implementation of the
interpolated type decides to fail, or if the interpolated type contains a
map with non-string keys, the <code>json!</code> macro will panic.</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="number">200</span>;
<span class="kw">let</span> <span class="ident">features</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;serde&quot;</span>, <span class="string">&quot;json&quot;</span>];
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>({
<span class="string">&quot;code&quot;</span>: <span class="ident">code</span>,
<span class="string">&quot;success&quot;</span>: <span class="ident">code</span> <span class="op">==</span> <span class="number">200</span>,
<span class="string">&quot;payload&quot;</span>: {
<span class="ident">features</span>[<span class="number">0</span>]: <span class="ident">features</span>[<span class="number">1</span>]
}
});</pre>
<p>Trailing commas are allowed inside both arrays and objects.</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>([
<span class="string">&quot;notice&quot;</span>,
<span class="string">&quot;the&quot;</span>,
<span class="string">&quot;trailing&quot;</span>,
<span class="string">&quot;comma --&gt;&quot;</span>,
]);</pre>
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