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class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/category/guides"><span itemprop="name">Guides</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Debugging</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 22.2.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Debugging</h1>
<p>Debugging with Puppeteer can be an arduous task. There is no <em>single</em> 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 <em>several</em> methods for debugging which hopefully does cover all possible
issues.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="background">Background<a href="#background" class="hash-link" aria-label="Direct link to Background" title="Direct link to Background">​</a></h2>
<p>In general, there are two possible sources of an issue: Code running on Node.js
(which we call <em>server code</em>), and
<a href="/api/puppeteer.page.evaluate">code running in the browser</a>
(which we call <em>client code</em>). There is also a third possible source being the
browser itself (which we call <em>internal code</em>), but if you suspect this is the
source <strong>after attempting the methods below</strong>, we suggest
<a href="https://github.com/puppeteer/puppeteer/issues" target="_blank" rel="noopener noreferrer">searching existing issues</a>
before
<a href="https://github.com/puppeteer/puppeteer/issues/new/choose" target="_blank" rel="noopener noreferrer">filing an issue</a>.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="debugging-methods-for-all-situations">Debugging methods for all situations<a href="#debugging-methods-for-all-situations" class="hash-link" aria-label="Direct link to Debugging methods for all situations" title="Direct link to Debugging methods for all situations">​</a></h2>
<p>These methods can be used to debug any situation. These should be used as a
quick sanity check before diving into more complex methods.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="turn-off-headless">Turn off <a href="/api/puppeteer.browserlaunchargumentoptions"><code>headless</code></a><a href="#turn-off-headless" class="hash-link" aria-label="Direct link to turn-off-headless" title="Direct link to turn-off-headless">​</a></h3>
<p>Sometimes it&#x27;s useful to see what the browser is displaying. Instead of
launching in
<a href="/api/puppeteer.browserlaunchargumentoptions"><code>headless</code></a> mode,
launch a full version of the browser with
<a href="/api/puppeteer.browserlaunchargumentoptions"><code>headless</code></a> set to
<code>false</code>:</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" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> browser </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> puppeteer</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">launch</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain">headless</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">false</span><span class="token punctuation" style="color:#393A34">}</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="puppeteer-slow-mo">Puppeteer &quot;slow-mo&quot;<a href="#puppeteer-slow-mo" class="hash-link" aria-label="Direct link to Puppeteer &quot;slow-mo&quot;" title="Direct link to Puppeteer &quot;slow-mo&quot;">​</a></h3>
<p>The <a href="/api/puppeteer.browserconnectoptions"><code>slowMo</code></a> option slows down
Puppeteer operations by a specified amount of milliseconds. It&#x27;s another way to
help see what&#x27;s going on.</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" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> browser </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> puppeteer</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">launch</span><span class="token punctuation" style="color:#393A34">(</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"> headless</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">false</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"> slowMo</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">250</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// slow down by 250ms</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="debugging-methods-for-client-code">Debugging methods for client code<a href="#debugging-methods-for-client-code" class="hash-link" aria-label="Direct link to Debugging methods for client code" title="Direct link to Debugging methods for client code">​</a></h2>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="capture-console-output">Capture <code>console.*</code> output<a href="#capture-console-output" class="hash-link" aria-label="Direct link to capture-console-output" title="Direct link to capture-console-output">​</a></h3>
<p>Since client code runs in the browser, doing <code>console.*</code> in client code will not
directly log to Node.js. However, you can <a href="/api/puppeteer.page">listen (page.on)</a> for
the <a href="/api/puppeteer.pageevents"><code>console</code></a> event which returns a
payload with the logged text.</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" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">page</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">on</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;console&#x27;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> msg </span><span class="token operator" style="color:#393A34">=&gt;</span><span class="token plain"> </span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;PAGE LOG:&#x27;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> msg</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">text</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</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" style="display:inline-block"></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">evaluate</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=&gt;</span><span class="token plain"> </span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token template-string template-punctuation string" style="color:#e3116c">`</span><span class="token template-string string" style="color:#e3116c">url is </span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">location</span><span class="token template-string interpolation punctuation" style="color:#393A34">.</span><span class="token template-string interpolation">href</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string template-punctuation string" style="color:#e3116c">`</span><span class="token punctuation" style="color:#393A34">)</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-the-debugger-in-the-browser">Use the debugger in the browser<a href="#use-the-debugger-in-the-browser" class="hash-link" aria-label="Direct link to Use the debugger in the browser" title="Direct link to Use the debugger in the browser">​</a></h3>
<ol>
<li>
<p>Set <a href="/api/puppeteer.browserlaunchargumentoptions"><code>devtools</code></a> to
<code>true</code> when launching Puppeteer:</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" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> browser </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> puppeteer</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">launch</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain">devtools</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">true</span><span class="token punctuation" style="color:#393A34">}</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>
</li>
<li>
<p>Add <code>debugger</code> inside any client 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" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><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">evaluate</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=&gt;</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 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 punctuation" style="color:#393A34">}</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>The Browser will now stop in the location the <code>debugger</code> word is found in
debug mode.</p>
</li>
</ol>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="debugging-methods-for-server-code">Debugging methods for server code<a href="#debugging-methods-for-server-code" class="hash-link" aria-label="Direct link to Debugging methods for server code" title="Direct link to Debugging methods for server code">​</a></h2>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-the-debugger-in-nodejs-chromechromium-only">Use the debugger in Node.js (Chrome/Chromium-only)<a href="#use-the-debugger-in-nodejs-chromechromium-only" class="hash-link" aria-label="Direct link to Use the debugger in Node.js (Chrome/Chromium-only)" title="Direct link to Use the debugger in Node.js (Chrome/Chromium-only)">​</a></h3>
<p>Since server code intermingles with client code, this method of debugging is
closely tied with the browser. For example, you can step over
<code>await page.click()</code> in the server script and see the click happen in the
browser.</p>
<p>Note that you won&#x27;t be able to run <code>await page.click()</code> in DevTools console due
to this
<a href="https://bugs.chromium.org/p/chromium/issues/detail?id=833928" target="_blank" rel="noopener noreferrer">Chromium bug</a>, so
if you want to try something out, you have to add it to your test file.</p>
<ol>
<li>
<p>Set <a href="/api/puppeteer.browserlaunchargumentoptions"><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" style="color:#393A34;background-color:#f6f8fa"><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">&#x27;a[target=_blank]&#x27;</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>
</li>
<li>
<p>Run your server code with <code>--inspect-brk</code>. For example,</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">node</span><span class="token plain"> --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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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>
</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="log-devtools-protocol-traffic">Log DevTools protocol traffic<a href="#log-devtools-protocol-traffic" class="hash-link" aria-label="Direct link to Log DevTools protocol traffic" title="Direct link to Log DevTools protocol traffic">​</a></h3>
<p>If all else fails, it&#x27;s possible there may be an issue between Puppeteer and the
DevTools protocol. You can debug this by setting the <code>DEBUG</code> environment
variable before running your script. This will log internal traffic via
<a href="https://github.com/visionmedia/debug" target="_blank" rel="noopener noreferrer"><code>debug</code></a> under the <code>puppeteer</code> namespace.</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># Basic verbose logging</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">env</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">DEBUG</span><span class="token operator" style="color:#393A34">=</span><span class="token string" style="color:#e3116c">&quot;puppeteer:*&quot;</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">node</span><span class="token plain"> script.js</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Prevent truncating of long messages</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">env</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">DEBUG</span><span class="token operator" style="color:#393A34">=</span><span class="token string" style="color:#e3116c">&quot;puppeteer:*&quot;</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">env</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">DEBUG_MAX_STRING_LENGTH</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">null </span><span class="token function" style="color:#d73a49">node</span><span class="token plain"> script.js</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Protocol traffic can be rather noisy. This example filters out all Network domain messages</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">env</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">DEBUG</span><span class="token operator" style="color:#393A34">=</span><span class="token string" style="color:#e3116c">&quot;puppeteer:*&quot;</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">env</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">DEBUG_COLORS</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">true </span><span class="token function" style="color:#d73a49">node</span><span class="token plain"> script.js </span><span class="token operator file-descriptor important" style="color:#393A34">2</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token file-descriptor important">&amp;1</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">|</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">grep</span><span class="token plain"> </span><span class="token parameter variable" style="color:#36acaa">-v</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">&#x27;&quot;Network&#x27;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Filter out all protocol messages but keep all other logging</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">env</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">DEBUG</span><span class="token operator" style="color:#393A34">=</span><span class="token string" style="color:#e3116c">&quot;puppeteer:*,-puppeteer:protocol:*&quot;</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">node</span><span class="token plain"> 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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><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_LjdS"><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></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/guides/chrome-extensions"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Chrome Extensions</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/category/integrations"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Integrations</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="#background" class="table-of-contents__link toc-highlight">Background</a></li><li><a href="#debugging-methods-for-all-situations" class="table-of-contents__link toc-highlight">Debugging methods for all situations</a><ul><li><a href="#turn-off-headless" class="table-of-contents__link toc-highlight">Turn off <code>headless</code></a></li><li><a href="#puppeteer-slow-mo" class="table-of-contents__link toc-highlight">Puppeteer &quot;slow-mo&quot;</a></li></ul></li><li><a href="#debugging-methods-for-client-code" class="table-of-contents__link toc-highlight">Debugging methods for client code</a><ul><li><a href="#capture-console-output" class="table-of-contents__link toc-highlight">Capture <code>console.*</code> output</a></li><li><a href="#use-the-debugger-in-the-browser" class="table-of-contents__link toc-highlight">Use the debugger in the browser</a></li></ul></li><li><a href="#debugging-methods-for-server-code" class="table-of-contents__link toc-highlight">Debugging methods for server code</a><ul><li><a href="#use-the-debugger-in-nodejs-chromechromium-only" class="table-of-contents__link toc-highlight">Use the debugger in Node.js (Chrome/Chromium-only)</a></li><li><a href="#log-devtools-protocol-traffic" class="table-of-contents__link toc-highlight">Log DevTools protocol traffic</a></li></ul></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" 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