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<title data-rh="true">WebWorker.evaluate() method | Puppeteer</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://pptr.dev/next/api/puppeteer.webworker.evaluate"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docsearch:counter" content="3"><meta data-rh="true" property="og:title" content="WebWorker.evaluate() method | Puppeteer"><meta data-rh="true" name="description" content="Evaluates a given function in the worker."><meta data-rh="true" property="og:description" content="Evaluates a given function in the worker."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://pptr.dev/next/api/puppeteer.webworker.evaluate"><link data-rh="true" rel="alternate" href="https://pptr.dev/next/api/puppeteer.webworker.evaluate" hreflang="en"><link data-rh="true" rel="alternate" href="https://pptr.dev/next/api/puppeteer.webworker.evaluate" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://DVKY664LG7-dsn.algolia.net" crossorigin="anonymous"><link rel="search" type="application/opensearchdescription+xml" title="Puppeteer" href="/opensearch.xml">
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<script>!function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return localStorage.getItem("theme")}catch(t){}}();t(null!==e?e:"light")}(),function(){try{const c=new URLSearchParams(window.location.search).entries();for(var[t,e]of c)if(t.startsWith("docusaurus-data-")){var a=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(a,e)}}catch(t){}}()</script><div id="__docusaurus"><div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><nav aria-label="Main" class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a class="navbar__brand" href="/"><div class="navbar__logo"><img src="https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt="Puppeteer Logo" class="themedComponent_mlkZ themedComponent--light_NVdE"><img src="https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt="Puppeteer Logo" class="themedComponent_mlkZ themedComponent--dark_xIcU"></div><b class="navbar__title text--truncate">Puppeteer</b></a><a class="navbar__item navbar__link" href="/next/">Docs</a><a aria-current="page" class="navbar__item navbar__link navbar__link--active" href="/next/api/puppeteer.puppeteernode">Puppeteer API</a><a class="navbar__item navbar__link" href="/next/browsers-api/">@puppeteer/browsers API</a></div><div class="navbar__items navbar__items--right"><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a class="navbar__link" aria-haspopup="true" aria-expanded="false" role="button" href="/next/">Next</a><ul class="dropdown__menu"><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/next/api/puppeteer.webworker.evaluate">Next</a></li><li><a class="dropdown__link" href="/api/puppeteer.webworker.evaluate">22.6.3</a></li><li><hr class="dropdown-separator"></li><li class="dropdown-archived-versions"><b>Archived versions</b></li><li><a href="https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.2/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">22.6.2<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li><a href="https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.1/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">22.6.1<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li><a href="https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">22.6.0<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li><a href="https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.5.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">22.5.0<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h1
<p>Evaluates a given function in the <a href="/next/api/puppeteer.webworker">worker</a>.</p>
<h4 class="anchor anchorWithStickyNavbar_LWe7" id="signature">Signature:<a href="#signature" class="hash-link" aria-label="Direct link to Signature:" title="Direct link to Signature:"></a></h4>
<div class="language-typescript codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-typescript codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">class</span><span class="token plain"> </span><span class="token class-name">WebWorker</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token generic-function function" style="color:#d73a49">evaluate</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name"></span><br></span><span class="token-line" style="color:#393A34"><span class="token generic-function generic class-name"> Params </span><span class="token generic-function generic class-name keyword" style="color:#00009f">extends</span><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name builtin">unknown</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">[</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">]</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">,</span><span class="token generic-function generic class-name"></span><br></span><span class="token-line" style="color:#393A34"><span class="token generic-function generic class-name"> Func </span><span class="token generic-function generic class-name keyword" style="color:#00009f">extends</span><span class="token generic-function generic class-name"> EvaluateFunc</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Params</span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;</span><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name operator" style="color:#393A34">=</span><span class="token generic-function generic class-name"> EvaluateFunc</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Params</span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">,</span><span class="token generic-function generic class-name"></span><br></span><span class="token-line" style="color:#393A34"><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">func</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> Func </span><span class="token operator" style="color:#393A34">|</span><span class="token plain"> </span><span class="token builtin">string</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">...</span><span class="token plain">args</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> Params</span><span class="token punctuation" style="color:#393A34">)</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">Promise</span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">Awaite
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="parameters">Parameters<a href="#parameters" class="hash-link" aria-label="Direct link to Parameters" title="Direct link to Parameters"></a></h2>
<table><thead><tr><th><p>Parameter</p></th><th><p>Type</p></th><th><p>Description</p></th></tr></thead><tbody><tr><td><p>func</p></td><td><p>Func | string</p></td><td><p>Function to be evaluated.</p></td></tr><tr><td><p>args</p></td><td><p>Params</p></td><td><p>Arguments to pass into <code>func</code>.</p></td></tr></tbody></table>
<p><strong>Returns:</strong></p>
<p>Promise&lt;Awaited&lt;ReturnType&lt;Func&gt;&gt;&gt;</p>
<p>The result of <code>func</code>.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="remarks">Remarks<a href="#remarks" class="hash-link" aria-label="Direct link to Remarks" title="Direct link to Remarks"></a></h2>
<p>If the given function returns a promise, <a href="/next/api/puppeteer.webworker.evaluate">evaluate</a> will wait for the promise to resolve.</p>
<p>As a rule of thumb, if the return value of the given function is more complicated than a JSON object (e.g. most classes), then <a href="/next/api/puppeteer.webworker.evaluate">evaluate</a> will _likely_ return some truncated value (or <code>{}</code>). This is because we are not returning the actual return value, but a deserialized version as a result of transferring the return value through a protocol to Puppeteer.</p>
<p>In general, you should use <a href="/next/api/puppeteer.webworker.evaluatehandle">evaluateHandle</a> if <a href="/next/api/puppeteer.webworker.evaluate">evaluate</a> cannot serialize the return value properly or you need a mutable <a href="/next/api/puppeteer.jshandle">handle</a> to the return object.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/next/api/puppeteer.webworker.close"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">WebWorker.close</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/next/api/puppeteer.webworker.evaluatehandle"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">WebWorker.evaluateHandle</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#parameters" class="table-of-contents__link toc-highlight">Parameters</a></li><li><a href="#remarks" class="table-of-contents__link toc-highlight">Remarks</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/puppeteer" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://twitter.com/chromedevtools" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://goo.gle/devtools-youtube" target="_blank" rel="noopener noreferrer" class="footer__link-item">YouTube<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2024 Google, Inc.</div></div></div></footer></div>
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