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class="theme-doc-markdown markdown"><header><h1>check</h1></header><p>The <code>check()</code> function is the main API used for validating and sanitizing HTTP requests with express-validator. It gives you access to all of the built-in validators, sanitizers, and a bunch of other utility functions to shape the validation just the way you need.</p> <h2 class="anchor anchorWithStickyNavbar_JmGV" id="check"><code>check()</code><a href="#check" class="hash-link" aria-label="Direct link to check" title="Direct link to check"></a></h2> <div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> check </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'express-validator'</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">check</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fields</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">|</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> message</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">any</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> ValidationChain</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <p><strong>Parameters:</strong></p> <table><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><code>fields</code></td><td>One or more field names to select. If omitted, selects the <a href="/docs/guides/field-selection#whole-body-selection">whole request location</a>.</td></tr><tr><td><code>message</code></td><td>Which error message to use when a validator doesn't specify one.</td></tr></tbody></table> <p>Creates a <a href="/docs/api/validation-chain">validation chain</a> for one or more fields. Fields are selected from any of the following request locations:</p> <ul> <li><code>req.body</code></li> <li><code>req.cookies</code></li> <li><code>req.headers</code></li> <li><code>req.query</code></li> <li><code>req.params</code></li> </ul> <p>If any of the fields is present in more than one location, then all instances of that field value are processed by the validation chain.</p> <h2 class="anchor anchorWithStickyNavbar_JmGV" id="body"><code>body()</code><a href="#body" class="hash-link" aria-label="Direct link to body" title="Direct link to body"></a></h2> <div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> body </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'express-validator'</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">body</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fields</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">|</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> message</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">any</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> ValidationChain</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <p>Same as <a href="#check"><code>check()</code></a>, but only checking <code>req.body</code>.</p> <h2 class="anchor anchorWithStickyNavbar_JmGV" id="cookie"><code>cookie()</code><a href="#cookie" class="hash-link" aria-label="Direct link to cookie" title="Direct link to cookie"></a></h2> <div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> cookie </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'express-validator'</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">cookie</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fields</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">|</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> message</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">any</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> ValidationChain</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <p>Same as <a href="#check"><code>check()</code></a>, but only checking <code>req.cookies</code>.</p> <h2 class="anchor anchorWithStickyNavbar_JmGV" id="header"><code>header()</code><a href="#header" class="hash-link" aria-label="Direct link to header" title="Direct link to header"></a></h2> <div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> header </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'express-validator'</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">header</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fields</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">|</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> message</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">any</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> ValidationChain</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <p>Same as <a href="#check"><code>check()</code></a>, but only checking <code>req.headers</code>.</p> <h2 class="anchor anchorWithStickyNavbar_JmGV" id="param"><code>param()</code><a href="#param" class="hash-link" aria-label="Direct link to param" title="Direct link to param"></a></h2> <div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> param </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'express-validator'</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">param</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fields</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">|</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> message</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">any</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> ValidationChain</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <p>Same as <a href="#params"><code>check()</code></a>, but only checking <code>req.params</code>.</p> <h2 class="anchor anchorWithStickyNavbar_JmGV" id="query"><code>query()</code><a href="#query" class="hash-link" aria-label="Direct link to query" title="Direct link to query"></a></h2> <div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> query </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'express-validator'</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">query</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fields</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">|</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">string</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> message</span><span class="token operator" style="color:rgb(137, 221, 255)">?</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">any</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> ValidationChain</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <p>Same as <a href="#check"><code>check()</code></a>, but only checking <code>req.query</code>.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/express-validator/express-validator/edit/master/docs/versioned_docs/version-7.2.0/api/check.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_bHB7" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_pbO5"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link 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