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<title data-rh="true">Debugging | Puppeteer</title><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://pptr.dev/next/guides/debugging"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Debugging | Puppeteer"><meta data-rh="true" name="description" content="Debugging with Puppeteer can be an arduous task. There is no single method for debugging all possible issues since Puppeteer touches many distinct components of a browser such as network requests and Web APIs. On a high note, Puppeteer provides several methods for debugging which hopefully does cover all possible issues."><meta data-rh="true" property="og:description" content="Debugging with Puppeteer can be an arduous task. There is no single method for debugging all possible issues since Puppeteer touches many distinct components of a browser such as network requests and Web APIs. On a high note, Puppeteer provides several methods for debugging which hopefully does cover all possible issues."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://pptr.dev/next/guides/debugging"><link data-rh="true" rel="alternate" href="https://pptr.dev/next/guides/debugging" hreflang="en"><link data-rh="true" rel="alternate" href="https://pptr.dev/next/guides/debugging" hreflang="x-default"><link rel="stylesheet" href="/assets/css/styles.121c39a6.css">
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<div role="region"><a href="#" class="skipToContent_fXgn">Skip to main content</a></div><nav class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Navigation bar toggle" class="navbar__toggle clean-btn" type="button" tabindex="0"><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="themedImage_ToTc themedImage--light_HNdA"><img src="https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt="Puppeteer Logo" class="themedImage_ToTc themedImage--dark_i4oU"></div><b class="navbar__title text--truncate">Puppeteer</b></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/guides/debugging">Next</a></li><li><a class="dropdown__link" href="/">18.2.1</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/v18.2.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">18.2.0<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/v18.1.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">18.1.0<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/v18.0.5/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">18.0.5<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/v18.0.4/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">18.0.4<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/v18.0.3/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">18.0.3<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/v18.0.2/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">18.0.2<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/v18.0.1/docs/api/index.md" target="_bl
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you want to try something out, you have to add it to your test file.</p><ol><li><p>Set <a href="https://pptr.dev/api/puppeteer.browserlaunchargumentoptions.headless" target="_blank" rel="noopener noreferrer"><code>headless</code></a> to <code>false</code>.</p></li><li><p>Add <code>debugger</code> to any server code you want debugged. For example,</p><div class="language-ts codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-ts codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">debugger</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 keyword" style="color:#00009f">await</span><span class="token plain"> page</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">click</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">'a[target=_blank]'</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path 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 class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Run your server code with <code>--inspect-brk</code>. For example,</p><div class="language-sh codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sh codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">node --inspect-brk path/to/script.js</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path 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 class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>In the opened Chrome/Chromium browser, open <code>chrome://inspect/#devices</code> and click <code>inspect</code>.</p></li><li><p>In the newly opened test browser, press <code>F8</code> to resume test execution.</p></li><li><p>Now your <code>debugger</code> statement will be hit and you can debug in the test browser.</p></li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-ndb">Use <a href="https://github.com/GoogleChromeLabs/ndb" target="_blank" rel="noopener noreferrer">ndb</a><a class="hash-link" href="#use-ndb" title="Direct link to heading"></a></h3><ol><li><p>Install <code>ndb</code>:</p><div class="language-sh codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sh codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">npm install -g ndb</span><br></span></code></pre><div class="buttonGroup__atx"><but
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