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1001cb0ef41Sopenharmony_ci <button class="theme-toggle-btn" id="theme-toggle-btn" title="Toggle dark mode/light mode" aria-label="Toggle dark mode/light mode" hidden> 1011cb0ef41Sopenharmony_ci <svg xmlns="http://www.w3.org/2000/svg" class="icon dark-icon" height="24" width="24"> 1021cb0ef41Sopenharmony_ci <path fill="none" d="M0 0h24v24H0z" /> 1031cb0ef41Sopenharmony_ci <path d="M11.1 12.08c-2.33-4.51-.5-8.48.53-10.07C6.27 2.2 1.98 6.59 1.98 12c0 .14.02.28.02.42.62-.27 1.29-.42 2-.42 1.66 0 3.18.83 4.1 2.15A4.01 4.01 0 0111 18c0 1.52-.87 2.83-2.12 3.51.98.32 2.03.5 3.11.5 3.5 0 6.58-1.8 8.37-4.52-2.36.23-6.98-.97-9.26-5.41z"/> 1041cb0ef41Sopenharmony_ci <path d="M7 16h-.18C6.4 14.84 5.3 14 4 14c-1.66 0-3 1.34-3 3s1.34 3 3 3h3c1.1 0 2-.9 2-2s-.9-2-2-2z"/> 1051cb0ef41Sopenharmony_ci </svg> 1061cb0ef41Sopenharmony_ci <svg xmlns="http://www.w3.org/2000/svg" class="icon light-icon" height="24" width="24"> 1071cb0ef41Sopenharmony_ci <path d="M0 0h24v24H0z" fill="none" /> 1081cb0ef41Sopenharmony_ci <path d="M6.76 4.84l-1.8-1.79-1.41 1.41 1.79 1.79 1.42-1.41zM4 10.5H1v2h3v-2zm9-9.95h-2V3.5h2V.55zm7.45 3.91l-1.41-1.41-1.79 1.79 1.41 1.41 1.79-1.79zm-3.21 13.7l1.79 1.8 1.41-1.41-1.8-1.79-1.4 1.4zM20 10.5v2h3v-2h-3zm-8-5c-3.31 0-6 2.69-6 6s2.69 6 6 6 6-2.69 6-6-2.69-6-6-6zm-1 16.95h2V19.5h-2v2.95zm-7.45-3.91l1.41 1.41 1.79-1.8-1.41-1.41-1.79 1.8z"/> 1091cb0ef41Sopenharmony_ci </svg> 1101cb0ef41Sopenharmony_ci </button> 1111cb0ef41Sopenharmony_ci </div> 1121cb0ef41Sopenharmony_ci <div id="gtoc"> 1131cb0ef41Sopenharmony_ci <ul> 1141cb0ef41Sopenharmony_ci <li class="pinned-header">Node.js v18.20.1</li> 1151cb0ef41Sopenharmony_ci 1161cb0ef41Sopenharmony_ci <li class="picker-header"> 1171cb0ef41Sopenharmony_ci <a href="#"> 1181cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 1191cb0ef41Sopenharmony_ci Table of contents 1201cb0ef41Sopenharmony_ci </a> 1211cb0ef41Sopenharmony_ci 1221cb0ef41Sopenharmony_ci <div class="picker"><div class="toc"><ul> 1231cb0ef41Sopenharmony_ci<li><span class="stability_2"><a href="#console">Console</a></span> 1241cb0ef41Sopenharmony_ci<ul> 1251cb0ef41Sopenharmony_ci<li><a href="#class-console">Class: <code>Console</code></a> 1261cb0ef41Sopenharmony_ci<ul> 1271cb0ef41Sopenharmony_ci<li><a href="#new-consolestdout-stderr-ignoreerrors"><code>new Console(stdout[, stderr][, ignoreErrors])</code></a></li> 1281cb0ef41Sopenharmony_ci<li><a href="#new-consoleoptions"><code>new Console(options)</code></a></li> 1291cb0ef41Sopenharmony_ci<li><a href="#consoleassertvalue-message"><code>console.assert(value[, ...message])</code></a></li> 1301cb0ef41Sopenharmony_ci<li><a href="#consoleclear"><code>console.clear()</code></a></li> 1311cb0ef41Sopenharmony_ci<li><a href="#consolecountlabel"><code>console.count([label])</code></a></li> 1321cb0ef41Sopenharmony_ci<li><a href="#consolecountresetlabel"><code>console.countReset([label])</code></a></li> 1331cb0ef41Sopenharmony_ci<li><a href="#consoledebugdata-args"><code>console.debug(data[, ...args])</code></a></li> 1341cb0ef41Sopenharmony_ci<li><a href="#consoledirobj-options"><code>console.dir(obj[, options])</code></a></li> 1351cb0ef41Sopenharmony_ci<li><a href="#consoledirxmldata"><code>console.dirxml(...data)</code></a></li> 1361cb0ef41Sopenharmony_ci<li><a href="#consoleerrordata-args"><code>console.error([data][, ...args])</code></a></li> 1371cb0ef41Sopenharmony_ci<li><a href="#consolegrouplabel"><code>console.group([...label])</code></a></li> 1381cb0ef41Sopenharmony_ci<li><a href="#consolegroupcollapsed"><code>console.groupCollapsed()</code></a></li> 1391cb0ef41Sopenharmony_ci<li><a href="#consolegroupend"><code>console.groupEnd()</code></a></li> 1401cb0ef41Sopenharmony_ci<li><a href="#consoleinfodata-args"><code>console.info([data][, ...args])</code></a></li> 1411cb0ef41Sopenharmony_ci<li><a href="#consolelogdata-args"><code>console.log([data][, ...args])</code></a></li> 1421cb0ef41Sopenharmony_ci<li><a href="#consoletabletabulardata-properties"><code>console.table(tabularData[, properties])</code></a></li> 1431cb0ef41Sopenharmony_ci<li><a href="#consoletimelabel"><code>console.time([label])</code></a></li> 1441cb0ef41Sopenharmony_ci<li><a href="#consoletimeendlabel"><code>console.timeEnd([label])</code></a></li> 1451cb0ef41Sopenharmony_ci<li><a href="#consoletimeloglabel-data"><code>console.timeLog([label][, ...data])</code></a></li> 1461cb0ef41Sopenharmony_ci<li><a href="#consoletracemessage-args"><code>console.trace([message][, ...args])</code></a></li> 1471cb0ef41Sopenharmony_ci<li><a href="#consolewarndata-args"><code>console.warn([data][, ...args])</code></a></li> 1481cb0ef41Sopenharmony_ci</ul> 1491cb0ef41Sopenharmony_ci</li> 1501cb0ef41Sopenharmony_ci<li><a href="#inspector-only-methods">Inspector only methods</a> 1511cb0ef41Sopenharmony_ci<ul> 1521cb0ef41Sopenharmony_ci<li><a href="#consoleprofilelabel"><code>console.profile([label])</code></a></li> 1531cb0ef41Sopenharmony_ci<li><a href="#consoleprofileendlabel"><code>console.profileEnd([label])</code></a></li> 1541cb0ef41Sopenharmony_ci<li><a href="#consoletimestamplabel"><code>console.timeStamp([label])</code></a></li> 1551cb0ef41Sopenharmony_ci</ul> 1561cb0ef41Sopenharmony_ci</li> 1571cb0ef41Sopenharmony_ci</ul> 1581cb0ef41Sopenharmony_ci</li> 1591cb0ef41Sopenharmony_ci</ul></div></div> 1601cb0ef41Sopenharmony_ci </li> 1611cb0ef41Sopenharmony_ci 1621cb0ef41Sopenharmony_ci 1631cb0ef41Sopenharmony_ci <li class="picker-header"> 1641cb0ef41Sopenharmony_ci <a href="#"> 1651cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 1661cb0ef41Sopenharmony_ci Index 1671cb0ef41Sopenharmony_ci </a> 1681cb0ef41Sopenharmony_ci 1691cb0ef41Sopenharmony_ci <div class="picker"><ul> 1701cb0ef41Sopenharmony_ci<li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> 1711cb0ef41Sopenharmony_ci<li><a href="synopsis.html" 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href="https://nodejs.org/docs/latest-v19.x/api/console.html">19.x</a></li> 2561cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v18.x/api/console.html">18.x <b>LTS</b></a></li> 2571cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v17.x/api/console.html">17.x</a></li> 2581cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v16.x/api/console.html">16.x</a></li> 2591cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v15.x/api/console.html">15.x</a></li> 2601cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v14.x/api/console.html">14.x</a></li> 2611cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v13.x/api/console.html">13.x</a></li> 2621cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v12.x/api/console.html">12.x</a></li> 2631cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v11.x/api/console.html">11.x</a></li> 2641cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v10.x/api/console.html">10.x</a></li> 2651cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v9.x/api/console.html">9.x</a></li> 2661cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v8.x/api/console.html">8.x</a></li> 2671cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v7.x/api/console.html">7.x</a></li> 2681cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v6.x/api/console.html">6.x</a></li> 2691cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v5.x/api/console.html">5.x</a></li> 2701cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v4.x/api/console.html">4.x</a></li> 2711cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v0.12.x/api/console.html">0.12.x</a></li> 2721cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v0.10.x/api/console.html">0.10.x</a></li></ol></div> 2731cb0ef41Sopenharmony_ci </li> 2741cb0ef41Sopenharmony_ci 2751cb0ef41Sopenharmony_ci <li class="picker-header"> 2761cb0ef41Sopenharmony_ci <a href="#"> 2771cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 2781cb0ef41Sopenharmony_ci Options 2791cb0ef41Sopenharmony_ci </a> 2801cb0ef41Sopenharmony_ci 2811cb0ef41Sopenharmony_ci <div class="picker"> 2821cb0ef41Sopenharmony_ci <ul> 2831cb0ef41Sopenharmony_ci <li> 2841cb0ef41Sopenharmony_ci <a href="all.html">View on single page</a> 2851cb0ef41Sopenharmony_ci </li> 2861cb0ef41Sopenharmony_ci <li> 2871cb0ef41Sopenharmony_ci <a href="console.json">View as JSON</a> 2881cb0ef41Sopenharmony_ci </li> 2891cb0ef41Sopenharmony_ci <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/console.md">Edit on GitHub</a></li> 2901cb0ef41Sopenharmony_ci </ul> 2911cb0ef41Sopenharmony_ci </div> 2921cb0ef41Sopenharmony_ci </li> 2931cb0ef41Sopenharmony_ci </ul> 2941cb0ef41Sopenharmony_ci </div> 2951cb0ef41Sopenharmony_ci <hr> 2961cb0ef41Sopenharmony_ci </header> 2971cb0ef41Sopenharmony_ci 2981cb0ef41Sopenharmony_ci <details id="toc" open><summary>Table of contents</summary><ul> 2991cb0ef41Sopenharmony_ci<li><span class="stability_2"><a href="#console">Console</a></span> 3001cb0ef41Sopenharmony_ci<ul> 3011cb0ef41Sopenharmony_ci<li><a href="#class-console">Class: <code>Console</code></a> 3021cb0ef41Sopenharmony_ci<ul> 3031cb0ef41Sopenharmony_ci<li><a href="#new-consolestdout-stderr-ignoreerrors"><code>new Console(stdout[, stderr][, ignoreErrors])</code></a></li> 3041cb0ef41Sopenharmony_ci<li><a href="#new-consoleoptions"><code>new Console(options)</code></a></li> 3051cb0ef41Sopenharmony_ci<li><a href="#consoleassertvalue-message"><code>console.assert(value[, ...message])</code></a></li> 3061cb0ef41Sopenharmony_ci<li><a href="#consoleclear"><code>console.clear()</code></a></li> 3071cb0ef41Sopenharmony_ci<li><a href="#consolecountlabel"><code>console.count([label])</code></a></li> 3081cb0ef41Sopenharmony_ci<li><a href="#consolecountresetlabel"><code>console.countReset([label])</code></a></li> 3091cb0ef41Sopenharmony_ci<li><a href="#consoledebugdata-args"><code>console.debug(data[, ...args])</code></a></li> 3101cb0ef41Sopenharmony_ci<li><a href="#consoledirobj-options"><code>console.dir(obj[, options])</code></a></li> 3111cb0ef41Sopenharmony_ci<li><a href="#consoledirxmldata"><code>console.dirxml(...data)</code></a></li> 3121cb0ef41Sopenharmony_ci<li><a href="#consoleerrordata-args"><code>console.error([data][, ...args])</code></a></li> 3131cb0ef41Sopenharmony_ci<li><a href="#consolegrouplabel"><code>console.group([...label])</code></a></li> 3141cb0ef41Sopenharmony_ci<li><a href="#consolegroupcollapsed"><code>console.groupCollapsed()</code></a></li> 3151cb0ef41Sopenharmony_ci<li><a href="#consolegroupend"><code>console.groupEnd()</code></a></li> 3161cb0ef41Sopenharmony_ci<li><a href="#consoleinfodata-args"><code>console.info([data][, ...args])</code></a></li> 3171cb0ef41Sopenharmony_ci<li><a href="#consolelogdata-args"><code>console.log([data][, ...args])</code></a></li> 3181cb0ef41Sopenharmony_ci<li><a href="#consoletabletabulardata-properties"><code>console.table(tabularData[, properties])</code></a></li> 3191cb0ef41Sopenharmony_ci<li><a href="#consoletimelabel"><code>console.time([label])</code></a></li> 3201cb0ef41Sopenharmony_ci<li><a href="#consoletimeendlabel"><code>console.timeEnd([label])</code></a></li> 3211cb0ef41Sopenharmony_ci<li><a href="#consoletimeloglabel-data"><code>console.timeLog([label][, ...data])</code></a></li> 3221cb0ef41Sopenharmony_ci<li><a href="#consoletracemessage-args"><code>console.trace([message][, ...args])</code></a></li> 3231cb0ef41Sopenharmony_ci<li><a href="#consolewarndata-args"><code>console.warn([data][, ...args])</code></a></li> 3241cb0ef41Sopenharmony_ci</ul> 3251cb0ef41Sopenharmony_ci</li> 3261cb0ef41Sopenharmony_ci<li><a href="#inspector-only-methods">Inspector only methods</a> 3271cb0ef41Sopenharmony_ci<ul> 3281cb0ef41Sopenharmony_ci<li><a href="#consoleprofilelabel"><code>console.profile([label])</code></a></li> 3291cb0ef41Sopenharmony_ci<li><a href="#consoleprofileendlabel"><code>console.profileEnd([label])</code></a></li> 3301cb0ef41Sopenharmony_ci<li><a href="#consoletimestamplabel"><code>console.timeStamp([label])</code></a></li> 3311cb0ef41Sopenharmony_ci</ul> 3321cb0ef41Sopenharmony_ci</li> 3331cb0ef41Sopenharmony_ci</ul> 3341cb0ef41Sopenharmony_ci</li> 3351cb0ef41Sopenharmony_ci</ul></details> 3361cb0ef41Sopenharmony_ci 3371cb0ef41Sopenharmony_ci <div id="apicontent"> 3381cb0ef41Sopenharmony_ci <h2>Console<span><a class="mark" href="#console" id="console">#</a></span><a aria-hidden="true" class="legacy" id="console_console"></a></h2> 3391cb0ef41Sopenharmony_ci 3401cb0ef41Sopenharmony_ci<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p> 3411cb0ef41Sopenharmony_ci<p><strong>Source Code:</strong> <a href="https://github.com/nodejs/node/blob/v18.20.1/lib/console.js">lib/console.js</a></p> 3421cb0ef41Sopenharmony_ci<p>The <code>node:console</code> module provides a simple debugging console that is similar to 3431cb0ef41Sopenharmony_cithe JavaScript console mechanism provided by web browsers.</p> 3441cb0ef41Sopenharmony_ci<p>The module exports two specific components:</p> 3451cb0ef41Sopenharmony_ci<ul> 3461cb0ef41Sopenharmony_ci<li>A <code>Console</code> class with methods such as <code>console.log()</code>, <code>console.error()</code>, and 3471cb0ef41Sopenharmony_ci<code>console.warn()</code> that can be used to write to any Node.js stream.</li> 3481cb0ef41Sopenharmony_ci<li>A global <code>console</code> instance configured to write to <a href="process.html#processstdout"><code>process.stdout</code></a> and 3491cb0ef41Sopenharmony_ci<a href="process.html#processstderr"><code>process.stderr</code></a>. The global <code>console</code> can be used without calling 3501cb0ef41Sopenharmony_ci<code>require('node:console')</code>.</li> 3511cb0ef41Sopenharmony_ci</ul> 3521cb0ef41Sopenharmony_ci<p><em><strong>Warning</strong></em>: The global console object's methods are neither consistently 3531cb0ef41Sopenharmony_cisynchronous like the browser APIs they resemble, nor are they consistently 3541cb0ef41Sopenharmony_ciasynchronous like all other Node.js streams. See the <a href="process.html#a-note-on-process-io">note on process I/O</a> for 3551cb0ef41Sopenharmony_cimore information.</p> 3561cb0ef41Sopenharmony_ci<p>Example using the global <code>console</code>:</p> 3571cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'hello world'</span>); 3581cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: hello world, to stdout</span> 3591cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'hello %s'</span>, <span class="hljs-string">'world'</span>); 3601cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: hello world, to stdout</span> 3611cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-string">'Whoops, something bad happened'</span>)); 3621cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints error message and stack trace to stderr:</span> 3631cb0ef41Sopenharmony_ci<span class="hljs-comment">// Error: Whoops, something bad happened</span> 3641cb0ef41Sopenharmony_ci<span class="hljs-comment">// at [eval]:5:15</span> 3651cb0ef41Sopenharmony_ci<span class="hljs-comment">// at Script.runInThisContext (node:vm:132:18)</span> 3661cb0ef41Sopenharmony_ci<span class="hljs-comment">// at Object.runInThisContext (node:vm:309:38)</span> 3671cb0ef41Sopenharmony_ci<span class="hljs-comment">// at node:internal/process/execution:77:19</span> 3681cb0ef41Sopenharmony_ci<span class="hljs-comment">// at [eval]-wrapper:6:22</span> 3691cb0ef41Sopenharmony_ci<span class="hljs-comment">// at evalScript (node:internal/process/execution:76:60)</span> 3701cb0ef41Sopenharmony_ci<span class="hljs-comment">// at node:internal/main/eval_string:23:3</span> 3711cb0ef41Sopenharmony_ci 3721cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> name = <span class="hljs-string">'Will Robinson'</span>; 3731cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">warn</span>(<span class="hljs-string">`Danger <span class="hljs-subst">${name}</span>! Danger!`</span>); 3741cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: Danger Will Robinson! Danger!, to stderr</span></code> <button class="copy-button">copy</button></pre> 3751cb0ef41Sopenharmony_ci<p>Example using the <code>Console</code> class:</p> 3761cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> out = <span class="hljs-title function_">getStreamSomehow</span>(); 3771cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> err = <span class="hljs-title function_">getStreamSomehow</span>(); 3781cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> myConsole = <span class="hljs-keyword">new</span> <span class="hljs-variable language_">console</span>.<span class="hljs-title class_">Console</span>(out, err); 3791cb0ef41Sopenharmony_ci 3801cb0ef41Sopenharmony_cimyConsole.<span class="hljs-title function_">log</span>(<span class="hljs-string">'hello world'</span>); 3811cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: hello world, to out</span> 3821cb0ef41Sopenharmony_cimyConsole.<span class="hljs-title function_">log</span>(<span class="hljs-string">'hello %s'</span>, <span class="hljs-string">'world'</span>); 3831cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: hello world, to out</span> 3841cb0ef41Sopenharmony_cimyConsole.<span class="hljs-title function_">error</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-string">'Whoops, something bad happened'</span>)); 3851cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: [Error: Whoops, something bad happened], to err</span> 3861cb0ef41Sopenharmony_ci 3871cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> name = <span class="hljs-string">'Will Robinson'</span>; 3881cb0ef41Sopenharmony_cimyConsole.<span class="hljs-title function_">warn</span>(<span class="hljs-string">`Danger <span class="hljs-subst">${name}</span>! Danger!`</span>); 3891cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: Danger Will Robinson! Danger!, to err</span></code> <button class="copy-button">copy</button></pre> 3901cb0ef41Sopenharmony_ci<section><h3>Class: <code>Console</code><span><a class="mark" href="#class-console" id="class-console">#</a></span><a aria-hidden="true" class="legacy" id="console_class_console"></a></h3> 3911cb0ef41Sopenharmony_ci<div class="api_metadata"> 3921cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 3931cb0ef41Sopenharmony_ci<table> 3941cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 3951cb0ef41Sopenharmony_ci<tr><td>v8.0.0</td> 3961cb0ef41Sopenharmony_ci<td><p>Errors that occur while writing to the underlying streams will now be ignored by default.</p></td></tr> 3971cb0ef41Sopenharmony_ci</tbody></table> 3981cb0ef41Sopenharmony_ci</details> 3991cb0ef41Sopenharmony_ci</div> 4001cb0ef41Sopenharmony_ci 4011cb0ef41Sopenharmony_ci<p>The <code>Console</code> class can be used to create a simple logger with configurable 4021cb0ef41Sopenharmony_cioutput streams and can be accessed using either <code>require('node:console').Console</code> 4031cb0ef41Sopenharmony_cior <code>console.Console</code> (or their destructured counterparts):</p> 4041cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> { <span class="hljs-title class_">Console</span> } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:console'</span>);</code> <button class="copy-button">copy</button></pre> 4051cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> { <span class="hljs-title class_">Console</span> } = <span class="hljs-variable language_">console</span>;</code> <button class="copy-button">copy</button></pre> 4061cb0ef41Sopenharmony_ci<h4><code>new Console(stdout[, stderr][, ignoreErrors])</code><span><a class="mark" href="#new-consolestdout-stderr-ignoreerrors" id="new-consolestdout-stderr-ignoreerrors">#</a></span><a aria-hidden="true" class="legacy" id="console_new_console_stdout_stderr_ignoreerrors"></a></h4> 4071cb0ef41Sopenharmony_ci<h4><code>new Console(options)</code><span><a class="mark" href="#new-consoleoptions" id="new-consoleoptions">#</a></span><a aria-hidden="true" class="legacy" id="console_new_console_options"></a></h4> 4081cb0ef41Sopenharmony_ci<div class="api_metadata"> 4091cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 4101cb0ef41Sopenharmony_ci<table> 4111cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 4121cb0ef41Sopenharmony_ci<tr><td>v14.2.0, v12.17.0</td> 4131cb0ef41Sopenharmony_ci<td><p>The <code>groupIndentation</code> option was introduced.</p></td></tr> 4141cb0ef41Sopenharmony_ci<tr><td>v11.7.0</td> 4151cb0ef41Sopenharmony_ci<td><p>The <code>inspectOptions</code> option is introduced.</p></td></tr> 4161cb0ef41Sopenharmony_ci<tr><td>v10.0.0</td> 4171cb0ef41Sopenharmony_ci<td><p>The <code>Console</code> constructor now supports an <code>options</code> argument, and the <code>colorMode</code> option was introduced.</p></td></tr> 4181cb0ef41Sopenharmony_ci<tr><td>v8.0.0</td> 4191cb0ef41Sopenharmony_ci<td><p>The <code>ignoreErrors</code> option was introduced.</p></td></tr> 4201cb0ef41Sopenharmony_ci</tbody></table> 4211cb0ef41Sopenharmony_ci</details> 4221cb0ef41Sopenharmony_ci</div> 4231cb0ef41Sopenharmony_ci<ul> 4241cb0ef41Sopenharmony_ci<li><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> 4251cb0ef41Sopenharmony_ci<ul> 4261cb0ef41Sopenharmony_ci<li><code>stdout</code> <a href="stream.html#class-streamwritable" class="type"><stream.Writable></a></li> 4271cb0ef41Sopenharmony_ci<li><code>stderr</code> <a href="stream.html#class-streamwritable" class="type"><stream.Writable></a></li> 4281cb0ef41Sopenharmony_ci<li><code>ignoreErrors</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> Ignore errors when writing to the underlying 4291cb0ef41Sopenharmony_cistreams. <strong>Default:</strong> <code>true</code>.</li> 4301cb0ef41Sopenharmony_ci<li><code>colorMode</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> Set color support for this <code>Console</code> instance. 4311cb0ef41Sopenharmony_ciSetting to <code>true</code> enables coloring while inspecting values. Setting to 4321cb0ef41Sopenharmony_ci<code>false</code> disables coloring while inspecting values. Setting to 4331cb0ef41Sopenharmony_ci<code>'auto'</code> makes color support depend on the value of the <code>isTTY</code> property 4341cb0ef41Sopenharmony_ciand the value returned by <code>getColorDepth()</code> on the respective stream. This 4351cb0ef41Sopenharmony_cioption can not be used, if <code>inspectOptions.colors</code> is set as well. 4361cb0ef41Sopenharmony_ci<strong>Default:</strong> <code>'auto'</code>.</li> 4371cb0ef41Sopenharmony_ci<li><code>inspectOptions</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> Specifies options that are passed along to 4381cb0ef41Sopenharmony_ci<a href="util.html#utilinspectobject-options"><code>util.inspect()</code></a>.</li> 4391cb0ef41Sopenharmony_ci<li><code>groupIndentation</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> Set group indentation. 4401cb0ef41Sopenharmony_ci<strong>Default:</strong> <code>2</code>.</li> 4411cb0ef41Sopenharmony_ci</ul> 4421cb0ef41Sopenharmony_ci</li> 4431cb0ef41Sopenharmony_ci</ul> 4441cb0ef41Sopenharmony_ci<p>Creates a new <code>Console</code> with one or two writable stream instances. <code>stdout</code> is a 4451cb0ef41Sopenharmony_ciwritable stream to print log or info output. <code>stderr</code> is used for warning or 4461cb0ef41Sopenharmony_cierror output. If <code>stderr</code> is not provided, <code>stdout</code> is used for <code>stderr</code>.</p> 4471cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> output = fs.<span class="hljs-title function_">createWriteStream</span>(<span class="hljs-string">'./stdout.log'</span>); 4481cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> errorOutput = fs.<span class="hljs-title function_">createWriteStream</span>(<span class="hljs-string">'./stderr.log'</span>); 4491cb0ef41Sopenharmony_ci<span class="hljs-comment">// Custom simple logger</span> 4501cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> logger = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Console</span>({ <span class="hljs-attr">stdout</span>: output, <span class="hljs-attr">stderr</span>: errorOutput }); 4511cb0ef41Sopenharmony_ci<span class="hljs-comment">// use it like console</span> 4521cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> count = <span class="hljs-number">5</span>; 4531cb0ef41Sopenharmony_cilogger.<span class="hljs-title function_">log</span>(<span class="hljs-string">'count: %d'</span>, count); 4541cb0ef41Sopenharmony_ci<span class="hljs-comment">// In stdout.log: count 5</span></code> <button class="copy-button">copy</button></pre> 4551cb0ef41Sopenharmony_ci<p>The global <code>console</code> is a special <code>Console</code> whose output is sent to 4561cb0ef41Sopenharmony_ci<a href="process.html#processstdout"><code>process.stdout</code></a> and <a href="process.html#processstderr"><code>process.stderr</code></a>. It is equivalent to calling:</p> 4571cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">new</span> <span class="hljs-title class_">Console</span>({ <span class="hljs-attr">stdout</span>: process.<span class="hljs-property">stdout</span>, <span class="hljs-attr">stderr</span>: process.<span class="hljs-property">stderr</span> });</code> <button class="copy-button">copy</button></pre> 4581cb0ef41Sopenharmony_ci<h4><code>console.assert(value[, ...message])</code><span><a class="mark" href="#consoleassertvalue-message" id="consoleassertvalue-message">#</a></span><a aria-hidden="true" class="legacy" id="console_console_assert_value_message"></a></h4> 4591cb0ef41Sopenharmony_ci<div class="api_metadata"> 4601cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 4611cb0ef41Sopenharmony_ci<table> 4621cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 4631cb0ef41Sopenharmony_ci<tr><td>v10.0.0</td> 4641cb0ef41Sopenharmony_ci<td><p>The implementation is now spec compliant and does not throw anymore.</p></td></tr> 4651cb0ef41Sopenharmony_ci<tr><td>v0.1.101</td> 4661cb0ef41Sopenharmony_ci<td><p><span>Added in: v0.1.101</span></p></td></tr> 4671cb0ef41Sopenharmony_ci</tbody></table> 4681cb0ef41Sopenharmony_ci</details> 4691cb0ef41Sopenharmony_ci</div> 4701cb0ef41Sopenharmony_ci<ul> 4711cb0ef41Sopenharmony_ci<li><code>value</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a> The value tested for being truthy.</li> 4721cb0ef41Sopenharmony_ci<li><code>...message</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a> All arguments besides <code>value</code> are used as error message.</li> 4731cb0ef41Sopenharmony_ci</ul> 4741cb0ef41Sopenharmony_ci<p><code>console.assert()</code> writes a message if <code>value</code> is <a href="https://developer.mozilla.org/en-US/docs/Glossary/Falsy">falsy</a> or omitted. It only 4751cb0ef41Sopenharmony_ciwrites a message and does not otherwise affect execution. The output always 4761cb0ef41Sopenharmony_cistarts with <code>"Assertion failed"</code>. If provided, <code>message</code> is formatted using 4771cb0ef41Sopenharmony_ci<a href="util.html#utilformatformat-args"><code>util.format()</code></a>.</p> 4781cb0ef41Sopenharmony_ci<p>If <code>value</code> is <a href="https://developer.mozilla.org/en-US/docs/Glossary/Truthy">truthy</a>, nothing happens.</p> 4791cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">assert</span>(<span class="hljs-literal">true</span>, <span class="hljs-string">'does nothing'</span>); 4801cb0ef41Sopenharmony_ci 4811cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">assert</span>(<span class="hljs-literal">false</span>, <span class="hljs-string">'Whoops %s work'</span>, <span class="hljs-string">'didn\'t'</span>); 4821cb0ef41Sopenharmony_ci<span class="hljs-comment">// Assertion failed: Whoops didn't work</span> 4831cb0ef41Sopenharmony_ci 4841cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">assert</span>(); 4851cb0ef41Sopenharmony_ci<span class="hljs-comment">// Assertion failed</span></code> <button class="copy-button">copy</button></pre> 4861cb0ef41Sopenharmony_ci<h4><code>console.clear()</code><span><a class="mark" href="#consoleclear" id="consoleclear">#</a></span><a aria-hidden="true" class="legacy" id="console_console_clear"></a></h4> 4871cb0ef41Sopenharmony_ci<div class="api_metadata"> 4881cb0ef41Sopenharmony_ci<span>Added in: v8.3.0</span> 4891cb0ef41Sopenharmony_ci</div> 4901cb0ef41Sopenharmony_ci<p>When <code>stdout</code> is a TTY, calling <code>console.clear()</code> will attempt to clear the 4911cb0ef41Sopenharmony_ciTTY. When <code>stdout</code> is not a TTY, this method does nothing.</p> 4921cb0ef41Sopenharmony_ci<p>The specific operation of <code>console.clear()</code> can vary across operating systems 4931cb0ef41Sopenharmony_ciand terminal types. For most Linux operating systems, <code>console.clear()</code> 4941cb0ef41Sopenharmony_cioperates similarly to the <code>clear</code> shell command. On Windows, <code>console.clear()</code> 4951cb0ef41Sopenharmony_ciwill clear only the output in the current terminal viewport for the Node.js 4961cb0ef41Sopenharmony_cibinary.</p> 4971cb0ef41Sopenharmony_ci<h4><code>console.count([label])</code><span><a class="mark" href="#consolecountlabel" id="consolecountlabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_count_label"></a></h4> 4981cb0ef41Sopenharmony_ci<div class="api_metadata"> 4991cb0ef41Sopenharmony_ci<span>Added in: v8.3.0</span> 5001cb0ef41Sopenharmony_ci</div> 5011cb0ef41Sopenharmony_ci<ul> 5021cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> The display label for the counter. <strong>Default:</strong> <code>'default'</code>.</li> 5031cb0ef41Sopenharmony_ci</ul> 5041cb0ef41Sopenharmony_ci<p>Maintains an internal counter specific to <code>label</code> and outputs to <code>stdout</code> the 5051cb0ef41Sopenharmony_cinumber of times <code>console.count()</code> has been called with the given <code>label</code>.</p> 5061cb0ef41Sopenharmony_ci<!-- eslint-skip --> 5071cb0ef41Sopenharmony_ci<pre><code class="language-js">> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>() 5081cb0ef41Sopenharmony_ci<span class="hljs-attr">default</span>: <span class="hljs-number">1</span> 5091cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5101cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>(<span class="hljs-string">'default'</span>) 5111cb0ef41Sopenharmony_ci<span class="hljs-attr">default</span>: <span class="hljs-number">2</span> 5121cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5131cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>(<span class="hljs-string">'abc'</span>) 5141cb0ef41Sopenharmony_ci<span class="hljs-attr">abc</span>: <span class="hljs-number">1</span> 5151cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5161cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>(<span class="hljs-string">'xyz'</span>) 5171cb0ef41Sopenharmony_ci<span class="hljs-attr">xyz</span>: <span class="hljs-number">1</span> 5181cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5191cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>(<span class="hljs-string">'abc'</span>) 5201cb0ef41Sopenharmony_ci<span class="hljs-attr">abc</span>: <span class="hljs-number">2</span> 5211cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5221cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>() 5231cb0ef41Sopenharmony_ci<span class="hljs-attr">default</span>: <span class="hljs-number">3</span> 5241cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5251cb0ef41Sopenharmony_ci></code> <button class="copy-button">copy</button></pre> 5261cb0ef41Sopenharmony_ci<h4><code>console.countReset([label])</code><span><a class="mark" href="#consolecountresetlabel" id="consolecountresetlabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_countreset_label"></a></h4> 5271cb0ef41Sopenharmony_ci<div class="api_metadata"> 5281cb0ef41Sopenharmony_ci<span>Added in: v8.3.0</span> 5291cb0ef41Sopenharmony_ci</div> 5301cb0ef41Sopenharmony_ci<ul> 5311cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> The display label for the counter. <strong>Default:</strong> <code>'default'</code>.</li> 5321cb0ef41Sopenharmony_ci</ul> 5331cb0ef41Sopenharmony_ci<p>Resets the internal counter specific to <code>label</code>.</p> 5341cb0ef41Sopenharmony_ci<!-- eslint-skip --> 5351cb0ef41Sopenharmony_ci<pre><code class="language-js">> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>(<span class="hljs-string">'abc'</span>); 5361cb0ef41Sopenharmony_ci<span class="hljs-attr">abc</span>: <span class="hljs-number">1</span> 5371cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5381cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">countReset</span>(<span class="hljs-string">'abc'</span>); 5391cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5401cb0ef41Sopenharmony_ci> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">count</span>(<span class="hljs-string">'abc'</span>); 5411cb0ef41Sopenharmony_ci<span class="hljs-attr">abc</span>: <span class="hljs-number">1</span> 5421cb0ef41Sopenharmony_ci<span class="hljs-literal">undefined</span> 5431cb0ef41Sopenharmony_ci></code> <button class="copy-button">copy</button></pre> 5441cb0ef41Sopenharmony_ci<h4><code>console.debug(data[, ...args])</code><span><a class="mark" href="#consoledebugdata-args" id="consoledebugdata-args">#</a></span><a aria-hidden="true" class="legacy" id="console_console_debug_data_args"></a></h4> 5451cb0ef41Sopenharmony_ci<div class="api_metadata"> 5461cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 5471cb0ef41Sopenharmony_ci<table> 5481cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 5491cb0ef41Sopenharmony_ci<tr><td>v8.10.0</td> 5501cb0ef41Sopenharmony_ci<td><p><code>console.debug</code> is now an alias for <code>console.log</code>.</p></td></tr> 5511cb0ef41Sopenharmony_ci<tr><td>v8.0.0</td> 5521cb0ef41Sopenharmony_ci<td><p><span>Added in: v8.0.0</span></p></td></tr> 5531cb0ef41Sopenharmony_ci</tbody></table> 5541cb0ef41Sopenharmony_ci</details> 5551cb0ef41Sopenharmony_ci</div> 5561cb0ef41Sopenharmony_ci<ul> 5571cb0ef41Sopenharmony_ci<li><code>data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 5581cb0ef41Sopenharmony_ci<li><code>...args</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 5591cb0ef41Sopenharmony_ci</ul> 5601cb0ef41Sopenharmony_ci<p>The <code>console.debug()</code> function is an alias for <a href="#consolelogdata-args"><code>console.log()</code></a>.</p> 5611cb0ef41Sopenharmony_ci<h4><code>console.dir(obj[, options])</code><span><a class="mark" href="#consoledirobj-options" id="consoledirobj-options">#</a></span><a aria-hidden="true" class="legacy" id="console_console_dir_obj_options"></a></h4> 5621cb0ef41Sopenharmony_ci<div class="api_metadata"> 5631cb0ef41Sopenharmony_ci<span>Added in: v0.1.101</span> 5641cb0ef41Sopenharmony_ci</div> 5651cb0ef41Sopenharmony_ci<ul> 5661cb0ef41Sopenharmony_ci<li><code>obj</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 5671cb0ef41Sopenharmony_ci<li><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> 5681cb0ef41Sopenharmony_ci<ul> 5691cb0ef41Sopenharmony_ci<li><code>showHidden</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> If <code>true</code> then the object's non-enumerable and symbol 5701cb0ef41Sopenharmony_ciproperties will be shown too. <strong>Default:</strong> <code>false</code>.</li> 5711cb0ef41Sopenharmony_ci<li><code>depth</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> Tells <a href="util.html#utilinspectobject-options"><code>util.inspect()</code></a> how many times to recurse while 5721cb0ef41Sopenharmony_ciformatting the object. This is useful for inspecting large complicated 5731cb0ef41Sopenharmony_ciobjects. To make it recurse indefinitely, pass <code>null</code>. <strong>Default:</strong> <code>2</code>.</li> 5741cb0ef41Sopenharmony_ci<li><code>colors</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> If <code>true</code>, then the output will be styled with ANSI color 5751cb0ef41Sopenharmony_cicodes. Colors are customizable; 5761cb0ef41Sopenharmony_cisee <a href="util.html#customizing-utilinspect-colors">customizing <code>util.inspect()</code> colors</a>. <strong>Default:</strong> <code>false</code>.</li> 5771cb0ef41Sopenharmony_ci</ul> 5781cb0ef41Sopenharmony_ci</li> 5791cb0ef41Sopenharmony_ci</ul> 5801cb0ef41Sopenharmony_ci<p>Uses <a href="util.html#utilinspectobject-options"><code>util.inspect()</code></a> on <code>obj</code> and prints the resulting string to <code>stdout</code>. 5811cb0ef41Sopenharmony_ciThis function bypasses any custom <code>inspect()</code> function defined on <code>obj</code>.</p> 5821cb0ef41Sopenharmony_ci<h4><code>console.dirxml(...data)</code><span><a class="mark" href="#consoledirxmldata" id="consoledirxmldata">#</a></span><a aria-hidden="true" class="legacy" id="console_console_dirxml_data"></a></h4> 5831cb0ef41Sopenharmony_ci<div class="api_metadata"> 5841cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 5851cb0ef41Sopenharmony_ci<table> 5861cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 5871cb0ef41Sopenharmony_ci<tr><td>v9.3.0</td> 5881cb0ef41Sopenharmony_ci<td><p><code>console.dirxml</code> now calls <code>console.log</code> for its arguments.</p></td></tr> 5891cb0ef41Sopenharmony_ci<tr><td>v8.0.0</td> 5901cb0ef41Sopenharmony_ci<td><p><span>Added in: v8.0.0</span></p></td></tr> 5911cb0ef41Sopenharmony_ci</tbody></table> 5921cb0ef41Sopenharmony_ci</details> 5931cb0ef41Sopenharmony_ci</div> 5941cb0ef41Sopenharmony_ci<ul> 5951cb0ef41Sopenharmony_ci<li><code>...data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 5961cb0ef41Sopenharmony_ci</ul> 5971cb0ef41Sopenharmony_ci<p>This method calls <code>console.log()</code> passing it the arguments received. 5981cb0ef41Sopenharmony_ciThis method does not produce any XML formatting.</p> 5991cb0ef41Sopenharmony_ci<h4><code>console.error([data][, ...args])</code><span><a class="mark" href="#consoleerrordata-args" id="consoleerrordata-args">#</a></span><a aria-hidden="true" class="legacy" id="console_console_error_data_args"></a></h4> 6001cb0ef41Sopenharmony_ci<div class="api_metadata"> 6011cb0ef41Sopenharmony_ci<span>Added in: v0.1.100</span> 6021cb0ef41Sopenharmony_ci</div> 6031cb0ef41Sopenharmony_ci<ul> 6041cb0ef41Sopenharmony_ci<li><code>data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6051cb0ef41Sopenharmony_ci<li><code>...args</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6061cb0ef41Sopenharmony_ci</ul> 6071cb0ef41Sopenharmony_ci<p>Prints to <code>stderr</code> with newline. Multiple arguments can be passed, with the 6081cb0ef41Sopenharmony_cifirst used as the primary message and all additional used as substitution 6091cb0ef41Sopenharmony_civalues similar to <a href="http://man7.org/linux/man-pages/man3/printf.3.html"><code>printf(3)</code></a> (the arguments are all passed to 6101cb0ef41Sopenharmony_ci<a href="util.html#utilformatformat-args"><code>util.format()</code></a>).</p> 6111cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> code = <span class="hljs-number">5</span>; 6121cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(<span class="hljs-string">'error #%d'</span>, code); 6131cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: error #5, to stderr</span> 6141cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(<span class="hljs-string">'error'</span>, code); 6151cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: error 5, to stderr</span></code> <button class="copy-button">copy</button></pre> 6161cb0ef41Sopenharmony_ci<p>If formatting elements (e.g. <code>%d</code>) are not found in the first string then 6171cb0ef41Sopenharmony_ci<a href="util.html#utilinspectobject-options"><code>util.inspect()</code></a> is called on each argument and the resulting string 6181cb0ef41Sopenharmony_civalues are concatenated. See <a href="util.html#utilformatformat-args"><code>util.format()</code></a> for more information.</p> 6191cb0ef41Sopenharmony_ci<h4><code>console.group([...label])</code><span><a class="mark" href="#consolegrouplabel" id="consolegrouplabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_group_label"></a></h4> 6201cb0ef41Sopenharmony_ci<div class="api_metadata"> 6211cb0ef41Sopenharmony_ci<span>Added in: v8.5.0</span> 6221cb0ef41Sopenharmony_ci</div> 6231cb0ef41Sopenharmony_ci<ul> 6241cb0ef41Sopenharmony_ci<li><code>...label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6251cb0ef41Sopenharmony_ci</ul> 6261cb0ef41Sopenharmony_ci<p>Increases indentation of subsequent lines by spaces for <code>groupIndentation</code> 6271cb0ef41Sopenharmony_cilength.</p> 6281cb0ef41Sopenharmony_ci<p>If one or more <code>label</code>s are provided, those are printed first without the 6291cb0ef41Sopenharmony_ciadditional indentation.</p> 6301cb0ef41Sopenharmony_ci<h4><code>console.groupCollapsed()</code><span><a class="mark" href="#consolegroupcollapsed" id="consolegroupcollapsed">#</a></span><a aria-hidden="true" class="legacy" id="console_console_groupcollapsed"></a></h4> 6311cb0ef41Sopenharmony_ci<div class="api_metadata"> 6321cb0ef41Sopenharmony_ci<span>Added in: v8.5.0</span> 6331cb0ef41Sopenharmony_ci</div> 6341cb0ef41Sopenharmony_ci<p>An alias for <a href="#consolegrouplabel"><code>console.group()</code></a>.</p> 6351cb0ef41Sopenharmony_ci<h4><code>console.groupEnd()</code><span><a class="mark" href="#consolegroupend" id="consolegroupend">#</a></span><a aria-hidden="true" class="legacy" id="console_console_groupend"></a></h4> 6361cb0ef41Sopenharmony_ci<div class="api_metadata"> 6371cb0ef41Sopenharmony_ci<span>Added in: v8.5.0</span> 6381cb0ef41Sopenharmony_ci</div> 6391cb0ef41Sopenharmony_ci<p>Decreases indentation of subsequent lines by spaces for <code>groupIndentation</code> 6401cb0ef41Sopenharmony_cilength.</p> 6411cb0ef41Sopenharmony_ci<h4><code>console.info([data][, ...args])</code><span><a class="mark" href="#consoleinfodata-args" id="consoleinfodata-args">#</a></span><a aria-hidden="true" class="legacy" id="console_console_info_data_args"></a></h4> 6421cb0ef41Sopenharmony_ci<div class="api_metadata"> 6431cb0ef41Sopenharmony_ci<span>Added in: v0.1.100</span> 6441cb0ef41Sopenharmony_ci</div> 6451cb0ef41Sopenharmony_ci<ul> 6461cb0ef41Sopenharmony_ci<li><code>data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6471cb0ef41Sopenharmony_ci<li><code>...args</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6481cb0ef41Sopenharmony_ci</ul> 6491cb0ef41Sopenharmony_ci<p>The <code>console.info()</code> function is an alias for <a href="#consolelogdata-args"><code>console.log()</code></a>.</p> 6501cb0ef41Sopenharmony_ci<h4><code>console.log([data][, ...args])</code><span><a class="mark" href="#consolelogdata-args" id="consolelogdata-args">#</a></span><a aria-hidden="true" class="legacy" id="console_console_log_data_args"></a></h4> 6511cb0ef41Sopenharmony_ci<div class="api_metadata"> 6521cb0ef41Sopenharmony_ci<span>Added in: v0.1.100</span> 6531cb0ef41Sopenharmony_ci</div> 6541cb0ef41Sopenharmony_ci<ul> 6551cb0ef41Sopenharmony_ci<li><code>data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6561cb0ef41Sopenharmony_ci<li><code>...args</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6571cb0ef41Sopenharmony_ci</ul> 6581cb0ef41Sopenharmony_ci<p>Prints to <code>stdout</code> with newline. Multiple arguments can be passed, with the 6591cb0ef41Sopenharmony_cifirst used as the primary message and all additional used as substitution 6601cb0ef41Sopenharmony_civalues similar to <a href="http://man7.org/linux/man-pages/man3/printf.3.html"><code>printf(3)</code></a> (the arguments are all passed to 6611cb0ef41Sopenharmony_ci<a href="util.html#utilformatformat-args"><code>util.format()</code></a>).</p> 6621cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> count = <span class="hljs-number">5</span>; 6631cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'count: %d'</span>, count); 6641cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: count: 5, to stdout</span> 6651cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'count:'</span>, count); 6661cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: count: 5, to stdout</span></code> <button class="copy-button">copy</button></pre> 6671cb0ef41Sopenharmony_ci<p>See <a href="util.html#utilformatformat-args"><code>util.format()</code></a> for more information.</p> 6681cb0ef41Sopenharmony_ci<h4><code>console.table(tabularData[, properties])</code><span><a class="mark" href="#consoletabletabulardata-properties" id="consoletabletabulardata-properties">#</a></span><a aria-hidden="true" class="legacy" id="console_console_table_tabulardata_properties"></a></h4> 6691cb0ef41Sopenharmony_ci<div class="api_metadata"> 6701cb0ef41Sopenharmony_ci<span>Added in: v10.0.0</span> 6711cb0ef41Sopenharmony_ci</div> 6721cb0ef41Sopenharmony_ci<ul> 6731cb0ef41Sopenharmony_ci<li><code>tabularData</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 6741cb0ef41Sopenharmony_ci<li><code>properties</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string[]></a> Alternate properties for constructing the table.</li> 6751cb0ef41Sopenharmony_ci</ul> 6761cb0ef41Sopenharmony_ci<p>Try to construct a table with the columns of the properties of <code>tabularData</code> 6771cb0ef41Sopenharmony_ci(or use <code>properties</code>) and rows of <code>tabularData</code> and log it. Falls back to just 6781cb0ef41Sopenharmony_cilogging the argument if it can't be parsed as tabular.</p> 6791cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-comment">// These can't be parsed as tabular data</span> 6801cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">table</span>(<span class="hljs-title class_">Symbol</span>()); 6811cb0ef41Sopenharmony_ci<span class="hljs-comment">// Symbol()</span> 6821cb0ef41Sopenharmony_ci 6831cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">table</span>(<span class="hljs-literal">undefined</span>); 6841cb0ef41Sopenharmony_ci<span class="hljs-comment">// undefined</span> 6851cb0ef41Sopenharmony_ci 6861cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">table</span>([{ <span class="hljs-attr">a</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">b</span>: <span class="hljs-string">'Y'</span> }, { <span class="hljs-attr">a</span>: <span class="hljs-string">'Z'</span>, <span class="hljs-attr">b</span>: <span class="hljs-number">2</span> }]); 6871cb0ef41Sopenharmony_ci<span class="hljs-comment">// ┌─────────┬─────┬─────┐</span> 6881cb0ef41Sopenharmony_ci<span class="hljs-comment">// │ (index) │ a │ b │</span> 6891cb0ef41Sopenharmony_ci<span class="hljs-comment">// ├─────────┼─────┼─────┤</span> 6901cb0ef41Sopenharmony_ci<span class="hljs-comment">// │ 0 │ 1 │ 'Y' │</span> 6911cb0ef41Sopenharmony_ci<span class="hljs-comment">// │ 1 │ 'Z' │ 2 │</span> 6921cb0ef41Sopenharmony_ci<span class="hljs-comment">// └─────────┴─────┴─────┘</span> 6931cb0ef41Sopenharmony_ci 6941cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">table</span>([{ <span class="hljs-attr">a</span>: <span class="hljs-number">1</span>, <span class="hljs-attr">b</span>: <span class="hljs-string">'Y'</span> }, { <span class="hljs-attr">a</span>: <span class="hljs-string">'Z'</span>, <span class="hljs-attr">b</span>: <span class="hljs-number">2</span> }], [<span class="hljs-string">'a'</span>]); 6951cb0ef41Sopenharmony_ci<span class="hljs-comment">// ┌─────────┬─────┐</span> 6961cb0ef41Sopenharmony_ci<span class="hljs-comment">// │ (index) │ a │</span> 6971cb0ef41Sopenharmony_ci<span class="hljs-comment">// ├─────────┼─────┤</span> 6981cb0ef41Sopenharmony_ci<span class="hljs-comment">// │ 0 │ 1 │</span> 6991cb0ef41Sopenharmony_ci<span class="hljs-comment">// │ 1 │ 'Z' │</span> 7001cb0ef41Sopenharmony_ci<span class="hljs-comment">// └─────────┴─────┘</span></code> <button class="copy-button">copy</button></pre> 7011cb0ef41Sopenharmony_ci<h4><code>console.time([label])</code><span><a class="mark" href="#consoletimelabel" id="consoletimelabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_time_label"></a></h4> 7021cb0ef41Sopenharmony_ci<div class="api_metadata"> 7031cb0ef41Sopenharmony_ci<span>Added in: v0.1.104</span> 7041cb0ef41Sopenharmony_ci</div> 7051cb0ef41Sopenharmony_ci<ul> 7061cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> <strong>Default:</strong> <code>'default'</code></li> 7071cb0ef41Sopenharmony_ci</ul> 7081cb0ef41Sopenharmony_ci<p>Starts a timer that can be used to compute the duration of an operation. Timers 7091cb0ef41Sopenharmony_ciare identified by a unique <code>label</code>. Use the same <code>label</code> when calling 7101cb0ef41Sopenharmony_ci<a href="#consoletimeendlabel"><code>console.timeEnd()</code></a> to stop the timer and output the elapsed time in 7111cb0ef41Sopenharmony_cisuitable time units to <code>stdout</code>. For example, if the elapsed 7121cb0ef41Sopenharmony_citime is 3869ms, <code>console.timeEnd()</code> displays "3.869s".</p> 7131cb0ef41Sopenharmony_ci<h4><code>console.timeEnd([label])</code><span><a class="mark" href="#consoletimeendlabel" id="consoletimeendlabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_timeend_label"></a></h4> 7141cb0ef41Sopenharmony_ci<div class="api_metadata"> 7151cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 7161cb0ef41Sopenharmony_ci<table> 7171cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 7181cb0ef41Sopenharmony_ci<tr><td>v13.0.0</td> 7191cb0ef41Sopenharmony_ci<td><p>The elapsed time is displayed with a suitable time unit.</p></td></tr> 7201cb0ef41Sopenharmony_ci<tr><td>v6.0.0</td> 7211cb0ef41Sopenharmony_ci<td><p>This method no longer supports multiple calls that don't map to individual <code>console.time()</code> calls; see below for details.</p></td></tr> 7221cb0ef41Sopenharmony_ci<tr><td>v0.1.104</td> 7231cb0ef41Sopenharmony_ci<td><p><span>Added in: v0.1.104</span></p></td></tr> 7241cb0ef41Sopenharmony_ci</tbody></table> 7251cb0ef41Sopenharmony_ci</details> 7261cb0ef41Sopenharmony_ci</div> 7271cb0ef41Sopenharmony_ci<ul> 7281cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> <strong>Default:</strong> <code>'default'</code></li> 7291cb0ef41Sopenharmony_ci</ul> 7301cb0ef41Sopenharmony_ci<p>Stops a timer that was previously started by calling <a href="#consoletimelabel"><code>console.time()</code></a> and 7311cb0ef41Sopenharmony_ciprints the result to <code>stdout</code>:</p> 7321cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">time</span>(<span class="hljs-string">'bunch-of-stuff'</span>); 7331cb0ef41Sopenharmony_ci<span class="hljs-comment">// Do a bunch of stuff.</span> 7341cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">timeEnd</span>(<span class="hljs-string">'bunch-of-stuff'</span>); 7351cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: bunch-of-stuff: 225.438ms</span></code> <button class="copy-button">copy</button></pre> 7361cb0ef41Sopenharmony_ci<h4><code>console.timeLog([label][, ...data])</code><span><a class="mark" href="#consoletimeloglabel-data" id="consoletimeloglabel-data">#</a></span><a aria-hidden="true" class="legacy" id="console_console_timelog_label_data"></a></h4> 7371cb0ef41Sopenharmony_ci<div class="api_metadata"> 7381cb0ef41Sopenharmony_ci<span>Added in: v10.7.0</span> 7391cb0ef41Sopenharmony_ci</div> 7401cb0ef41Sopenharmony_ci<ul> 7411cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> <strong>Default:</strong> <code>'default'</code></li> 7421cb0ef41Sopenharmony_ci<li><code>...data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 7431cb0ef41Sopenharmony_ci</ul> 7441cb0ef41Sopenharmony_ci<p>For a timer that was previously started by calling <a href="#consoletimelabel"><code>console.time()</code></a>, prints 7451cb0ef41Sopenharmony_cithe elapsed time and other <code>data</code> arguments to <code>stdout</code>:</p> 7461cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">time</span>(<span class="hljs-string">'process'</span>); 7471cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> value = <span class="hljs-title function_">expensiveProcess1</span>(); <span class="hljs-comment">// Returns 42</span> 7481cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">timeLog</span>(<span class="hljs-string">'process'</span>, value); 7491cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints "process: 365.227ms 42".</span> 7501cb0ef41Sopenharmony_ci<span class="hljs-title function_">doExpensiveProcess2</span>(value); 7511cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">timeEnd</span>(<span class="hljs-string">'process'</span>);</code> <button class="copy-button">copy</button></pre> 7521cb0ef41Sopenharmony_ci<h4><code>console.trace([message][, ...args])</code><span><a class="mark" href="#consoletracemessage-args" id="consoletracemessage-args">#</a></span><a aria-hidden="true" class="legacy" id="console_console_trace_message_args"></a></h4> 7531cb0ef41Sopenharmony_ci<div class="api_metadata"> 7541cb0ef41Sopenharmony_ci<span>Added in: v0.1.104</span> 7551cb0ef41Sopenharmony_ci</div> 7561cb0ef41Sopenharmony_ci<ul> 7571cb0ef41Sopenharmony_ci<li><code>message</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 7581cb0ef41Sopenharmony_ci<li><code>...args</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 7591cb0ef41Sopenharmony_ci</ul> 7601cb0ef41Sopenharmony_ci<p>Prints to <code>stderr</code> the string <code>'Trace: '</code>, followed by the <a href="util.html#utilformatformat-args"><code>util.format()</code></a> 7611cb0ef41Sopenharmony_ciformatted message and stack trace to the current position in the code.</p> 7621cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">trace</span>(<span class="hljs-string">'Show me'</span>); 7631cb0ef41Sopenharmony_ci<span class="hljs-comment">// Prints: (stack trace will vary based on where trace is called)</span> 7641cb0ef41Sopenharmony_ci<span class="hljs-comment">// Trace: Show me</span> 7651cb0ef41Sopenharmony_ci<span class="hljs-comment">// at repl:2:9</span> 7661cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.defaultEval (repl.js:248:27)</span> 7671cb0ef41Sopenharmony_ci<span class="hljs-comment">// at bound (domain.js:287:14)</span> 7681cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.runBound [as eval] (domain.js:300:12)</span> 7691cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.<anonymous> (repl.js:412:12)</span> 7701cb0ef41Sopenharmony_ci<span class="hljs-comment">// at emitOne (events.js:82:20)</span> 7711cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.emit (events.js:169:7)</span> 7721cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.Interface._onLine (readline.js:210:10)</span> 7731cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.Interface._line (readline.js:549:8)</span> 7741cb0ef41Sopenharmony_ci<span class="hljs-comment">// at REPLServer.Interface._ttyWrite (readline.js:826:14)</span></code> <button class="copy-button">copy</button></pre> 7751cb0ef41Sopenharmony_ci<h4><code>console.warn([data][, ...args])</code><span><a class="mark" href="#consolewarndata-args" id="consolewarndata-args">#</a></span><a aria-hidden="true" class="legacy" id="console_console_warn_data_args"></a></h4> 7761cb0ef41Sopenharmony_ci<div class="api_metadata"> 7771cb0ef41Sopenharmony_ci<span>Added in: v0.1.100</span> 7781cb0ef41Sopenharmony_ci</div> 7791cb0ef41Sopenharmony_ci<ul> 7801cb0ef41Sopenharmony_ci<li><code>data</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 7811cb0ef41Sopenharmony_ci<li><code>...args</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li> 7821cb0ef41Sopenharmony_ci</ul> 7831cb0ef41Sopenharmony_ci<p>The <code>console.warn()</code> function is an alias for <a href="#consoleerrordata-args"><code>console.error()</code></a>.</p> 7841cb0ef41Sopenharmony_ci</section><section><h3>Inspector only methods<span><a class="mark" href="#inspector-only-methods" id="inspector-only-methods">#</a></span><a aria-hidden="true" class="legacy" id="console_inspector_only_methods"></a></h3> 7851cb0ef41Sopenharmony_ci<p>The following methods are exposed by the V8 engine in the general API but do 7861cb0ef41Sopenharmony_cinot display anything unless used in conjunction with the <a href="debugger.html">inspector</a> 7871cb0ef41Sopenharmony_ci(<code>--inspect</code> flag).</p> 7881cb0ef41Sopenharmony_ci<h4><code>console.profile([label])</code><span><a class="mark" href="#consoleprofilelabel" id="consoleprofilelabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_profile_label"></a></h4> 7891cb0ef41Sopenharmony_ci<div class="api_metadata"> 7901cb0ef41Sopenharmony_ci<span>Added in: v8.0.0</span> 7911cb0ef41Sopenharmony_ci</div> 7921cb0ef41Sopenharmony_ci<ul> 7931cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 7941cb0ef41Sopenharmony_ci</ul> 7951cb0ef41Sopenharmony_ci<p>This method does not display anything unless used in the inspector. The 7961cb0ef41Sopenharmony_ci<code>console.profile()</code> method starts a JavaScript CPU profile with an optional 7971cb0ef41Sopenharmony_cilabel until <a href="#consoleprofileendlabel"><code>console.profileEnd()</code></a> is called. The profile is then added to 7981cb0ef41Sopenharmony_cithe <strong>Profile</strong> panel of the inspector.</p> 7991cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">profile</span>(<span class="hljs-string">'MyLabel'</span>); 8001cb0ef41Sopenharmony_ci<span class="hljs-comment">// Some code</span> 8011cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">profileEnd</span>(<span class="hljs-string">'MyLabel'</span>); 8021cb0ef41Sopenharmony_ci<span class="hljs-comment">// Adds the profile 'MyLabel' to the Profiles panel of the inspector.</span></code> <button class="copy-button">copy</button></pre> 8031cb0ef41Sopenharmony_ci<h4><code>console.profileEnd([label])</code><span><a class="mark" href="#consoleprofileendlabel" id="consoleprofileendlabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_profileend_label"></a></h4> 8041cb0ef41Sopenharmony_ci<div class="api_metadata"> 8051cb0ef41Sopenharmony_ci<span>Added in: v8.0.0</span> 8061cb0ef41Sopenharmony_ci</div> 8071cb0ef41Sopenharmony_ci<ul> 8081cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 8091cb0ef41Sopenharmony_ci</ul> 8101cb0ef41Sopenharmony_ci<p>This method does not display anything unless used in the inspector. Stops the 8111cb0ef41Sopenharmony_cicurrent JavaScript CPU profiling session if one has been started and prints 8121cb0ef41Sopenharmony_cithe report to the <strong>Profiles</strong> panel of the inspector. See 8131cb0ef41Sopenharmony_ci<a href="#consoleprofilelabel"><code>console.profile()</code></a> for an example.</p> 8141cb0ef41Sopenharmony_ci<p>If this method is called without a label, the most recently started profile is 8151cb0ef41Sopenharmony_cistopped.</p> 8161cb0ef41Sopenharmony_ci<h4><code>console.timeStamp([label])</code><span><a class="mark" href="#consoletimestamplabel" id="consoletimestamplabel">#</a></span><a aria-hidden="true" class="legacy" id="console_console_timestamp_label"></a></h4> 8171cb0ef41Sopenharmony_ci<div class="api_metadata"> 8181cb0ef41Sopenharmony_ci<span>Added in: v8.0.0</span> 8191cb0ef41Sopenharmony_ci</div> 8201cb0ef41Sopenharmony_ci<ul> 8211cb0ef41Sopenharmony_ci<li><code>label</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 8221cb0ef41Sopenharmony_ci</ul> 8231cb0ef41Sopenharmony_ci<p>This method does not display anything unless used in the inspector. The 8241cb0ef41Sopenharmony_ci<code>console.timeStamp()</code> method adds an event with the label <code>'label'</code> to the 8251cb0ef41Sopenharmony_ci<strong>Timeline</strong> panel of the inspector.</p></section> 8261cb0ef41Sopenharmony_ci <!-- API END --> 8271cb0ef41Sopenharmony_ci </div> 8281cb0ef41Sopenharmony_ci </div> 8291cb0ef41Sopenharmony_ci </div> 8301cb0ef41Sopenharmony_ci</body> 8311cb0ef41Sopenharmony_ci</html> 832