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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <meta name="nodejs.org:node-version" content="v18.19.1"> <title>Trace events | Node.js v18.19.1 Documentation</title> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/hljs.css"> <script async defer src="assets/api.js" type="text/javascript"></script> __JS_FLAVORED_DYNAMIC_CSS__ </head> <body class="alt apidoc" id="api-section-tracing"> <div id="content" class="clearfix"> <div id="column2" class="interior"> <div id="intro" class="interior"> <a href="index.html" title="Go back to the home page"> Node.js </a> </div> <ul> <li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> <li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> </ul> <hr class="line"/> <ul> <li><a href="assert.html" class="nav-assert">Assertion testing</a></li> <li><a href="async_context.html" 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href="#tracingcategories"><code>tracing.categories</code></a></li> <li><a href="#tracingdisable"><code>tracing.disable()</code></a></li> <li><a href="#tracingenable"><code>tracing.enable()</code></a></li> <li><a href="#tracingenabled"><code>tracing.enabled</code></a></li> </ul> </li> <li><a href="#trace_eventscreatetracingoptions"><code>trace_events.createTracing(options)</code></a></li> <li><a href="#trace_eventsgetenabledcategories"><code>trace_events.getEnabledCategories()</code></a></li> </ul> </li> <li><a href="#examples">Examples</a><ul> <li><a href="#collect-trace-events-data-by-inspector">Collect trace events data by inspector</a></li> </ul> </li> </ul> </li> </ul> </div></div> </li> <li class="picker-header"> <a href="#"> <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> Index </a> <div class="picker"><ul> <li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> <li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> <li> <a href="index.html">Index</a> </li> </ul> <hr class="line"/> <ul> <li><a href="assert.html" class="nav-assert">Assertion testing</a></li> <li><a href="async_context.html" class="nav-async_context">Asynchronous context tracking</a></li> <li><a href="async_hooks.html" class="nav-async_hooks">Async hooks</a></li> <li><a href="buffer.html" class="nav-buffer">Buffer</a></li> <li><a href="addons.html" class="nav-addons">C++ addons</a></li> <li><a href="n-api.html" class="nav-n-api">C/C++ addons with Node-API</a></li> <li><a href="embedding.html" class="nav-embedding">C++ embedder API</a></li> <li><a href="child_process.html" class="nav-child_process">Child processes</a></li> <li><a href="cluster.html" class="nav-cluster">Cluster</a></li> <li><a href="cli.html" class="nav-cli">Command-line options</a></li> <li><a href="console.html" class="nav-console">Console</a></li> <li><a href="corepack.html" class="nav-corepack">Corepack</a></li> <li><a href="crypto.html" 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class="nav-webcrypto">Web Crypto API</a></li> <li><a href="webstreams.html" class="nav-webstreams">Web Streams API</a></li> <li><a href="worker_threads.html" class="nav-worker_threads">Worker threads</a></li> <li><a href="zlib.html" class="nav-zlib">Zlib</a></li> </ul> <hr class="line"/> <ul> <li><a href="https://github.com/nodejs/node" class="nav-https-github-com-nodejs-node">Code repository and issue tracker</a></li> </ul> </div> </li> <li class="picker-header"> <a href="#"> <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> Other versions </a> <div class="picker"><ol id="alt-docs"><li><a href="https://nodejs.org/docs/latest-v18.x/api/tracing.html">18.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v17.x/api/tracing.html">17.x</a></li> <li><a href="https://nodejs.org/docs/latest-v16.x/api/tracing.html">16.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v15.x/api/tracing.html">15.x</a></li> <li><a href="https://nodejs.org/docs/latest-v14.x/api/tracing.html">14.x</a></li> <li><a href="https://nodejs.org/docs/latest-v13.x/api/tracing.html">13.x</a></li> <li><a href="https://nodejs.org/docs/latest-v12.x/api/tracing.html">12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v11.x/api/tracing.html">11.x</a></li> <li><a href="https://nodejs.org/docs/latest-v10.x/api/tracing.html">10.x</a></li> <li><a href="https://nodejs.org/docs/latest-v9.x/api/tracing.html">9.x</a></li> <li><a href="https://nodejs.org/docs/latest-v8.x/api/tracing.html">8.x</a></li> <li><a href="https://nodejs.org/docs/latest-v7.x/api/tracing.html">7.x</a></li></ol></div> </li> <li class="picker-header"> <a href="#"> <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> Options </a> <div class="picker"> <ul> <li> <a href="all.html">View on single page</a> </li> <li> <a href="tracing.json">View as JSON</a> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/master/doc/api/tracing.md">Edit on GitHub</a></li> </ul> </div> </li> </ul> </div> <hr> </header> <details id="toc" open><summary>Table of contents</summary><ul> <li><a href="#trace-events">Trace events</a><ul> <li><a href="#the-nodetrace_events-module">The <code>node:trace_events</code> module</a><ul> <li><a href="#tracing-object"><code>Tracing</code> object</a><ul> <li><a href="#tracingcategories"><code>tracing.categories</code></a></li> <li><a href="#tracingdisable"><code>tracing.disable()</code></a></li> <li><a href="#tracingenable"><code>tracing.enable()</code></a></li> <li><a href="#tracingenabled"><code>tracing.enabled</code></a></li> </ul> </li> <li><a href="#trace_eventscreatetracingoptions"><code>trace_events.createTracing(options)</code></a></li> <li><a href="#trace_eventsgetenabledcategories"><code>trace_events.getEnabledCategories()</code></a></li> </ul> </li> <li><a href="#examples">Examples</a><ul> <li><a href="#collect-trace-events-data-by-inspector">Collect trace events data by inspector</a></li> </ul> </li> </ul> </li> </ul> </details> <div id="apicontent"> <h2>Trace events<span><a class="mark" href="#trace-events" id="trace-events">#</a></span><a aria-hidden="true" class="legacy" id="tracing_trace_events"></a></h2> <!--introduced_in=v7.7.0--> <blockquote> <p>Stability: 1 - Experimental</p> </blockquote> <!-- source_link=lib/trace_events.js --> <p>The <code>node:trace_events</code> module provides a mechanism to centralize tracing information generated by V8, Node.js core, and userspace code.</p> <p>Tracing can be enabled with the <code>--trace-event-categories</code> command-line flag or by using the <code>node:trace_events</code> module. The <code>--trace-event-categories</code> flag accepts a list of comma-separated category names.</p> <p>The available categories are:</p> <ul> <li><code>node</code>: An empty placeholder.</li> <li><code>node.async_hooks</code>: Enables capture of detailed <a href="async_hooks.html"><code>async_hooks</code></a> trace data. The <a href="async_hooks.html"><code>async_hooks</code></a> events have a unique <code>asyncId</code> and a special <code>triggerId</code> <code>triggerAsyncId</code> property.</li> <li><code>node.bootstrap</code>: Enables capture of Node.js bootstrap milestones.</li> <li><code>node.console</code>: Enables capture of <code>console.time()</code> and <code>console.count()</code> output.</li> <li><code>node.threadpoolwork.sync</code>: Enables capture of trace data for threadpool synchronous operations, such as <code>blob</code>, <code>zlib</code>, <code>crypto</code> and <code>node_api</code>.</li> <li><code>node.threadpoolwork.async</code>: Enables capture of trace data for threadpool asynchronous operations, such as <code>blob</code>, <code>zlib</code>, <code>crypto</code> and <code>node_api</code>.</li> <li><code>node.dns.native</code>: Enables capture of trace data for DNS queries.</li> <li><code>node.net.native</code>: Enables capture of trace data for network.</li> <li><code>node.environment</code>: Enables capture of Node.js Environment milestones.</li> <li><code>node.fs.sync</code>: Enables capture of trace data for file system sync methods.</li> <li><code>node.fs_dir.sync</code>: Enables capture of trace data for file system sync directory methods.</li> <li><code>node.fs.async</code>: Enables capture of trace data for file system async methods.</li> <li><code>node.fs_dir.async</code>: Enables capture of trace data for file system async directory methods.</li> <li><code>node.perf</code>: Enables capture of <a href="perf_hooks.html">Performance API</a> measurements.<ul> <li><code>node.perf.usertiming</code>: Enables capture of only Performance API User Timing measures and marks.</li> <li><code>node.perf.timerify</code>: Enables capture of only Performance API timerify measurements.</li> </ul> </li> <li><code>node.promises.rejections</code>: Enables capture of trace data tracking the number of unhandled Promise rejections and handled-after-rejections.</li> <li><code>node.vm.script</code>: Enables capture of trace data for the <code>node:vm</code> module's <code>runInNewContext()</code>, <code>runInContext()</code>, and <code>runInThisContext()</code> methods.</li> <li><code>v8</code>: The <a href="v8.html">V8</a> events are GC, compiling, and execution related.</li> <li><code>node.http</code>: Enables capture of trace data for http request / response.</li> </ul> <p>By default the <code>node</code>, <code>node.async_hooks</code>, and <code>v8</code> categories are enabled.</p> <pre><code class="language-bash">node --trace-event-categories v8,node,node.async_hooks server.js </code></pre> <p>Prior versions of Node.js required the use of the <code>--trace-events-enabled</code> flag to enable trace events. This requirement has been removed. However, the <code>--trace-events-enabled</code> flag <em>may</em> still be used and will enable the <code>node</code>, <code>node.async_hooks</code>, and <code>v8</code> trace event categories by default.</p> <pre><code class="language-bash">node --trace-events-enabled # is equivalent to node --trace-event-categories v8,node,node.async_hooks </code></pre> <p>Alternatively, trace events may be enabled using the <code>node:trace_events</code> module:</p> <pre><code class="language-js">const trace_events = require('node:trace_events'); const tracing = trace_events.createTracing({ categories: ['node.perf'] }); tracing.enable(); // Enable trace event capture for the 'node.perf' category // do work tracing.disable(); // Disable trace event capture for the 'node.perf' category </code></pre> <p>Running Node.js with tracing enabled will produce log files that can be opened in the <a href="https://www.chromium.org/developers/how-tos/trace-event-profiling-tool"><code>chrome://tracing</code></a> tab of Chrome.</p> <p>The logging file is by default called <code>node_trace.${rotation}.log</code>, where <code>${rotation}</code> is an incrementing log-rotation id. The filepath pattern can be specified with <code>--trace-event-file-pattern</code> that accepts a template string that supports <code>${rotation}</code> and <code>${pid}</code>:</p> <pre><code class="language-bash">node --trace-event-categories v8 --trace-event-file-pattern '${pid}-${rotation}.log' server.js </code></pre> <p>To guarantee that the log file is properly generated after signal events like <code>SIGINT</code>, <code>SIGTERM</code>, or <code>SIGBREAK</code>, make sure to have the appropriate handlers in your code, such as:</p> <pre><code class="language-js">process.on('SIGINT', function onSigint() { console.info('Received SIGINT.'); process.exit(130); // Or applicable exit code depending on OS and signal }); </code></pre> <p>The tracing system uses the same time source as the one used by <code>process.hrtime()</code>. However the trace-event timestamps are expressed in microseconds, unlike <code>process.hrtime()</code> which returns nanoseconds.</p> <p>The features from this module are not available in <a href="worker_threads.html#class-worker"><code>Worker</code></a> threads.</p> <section><h3>The <code>node:trace_events</code> module<span><a class="mark" href="#the-nodetrace_events-module" id="the-nodetrace_events-module">#</a></span><a aria-hidden="true" class="legacy" id="tracing_the_node_trace_events_module"></a></h3> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><h4><code>Tracing</code> object<span><a class="mark" href="#tracing-object" id="tracing-object">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_object"></a></h4> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><p>The <code>Tracing</code> object is used to enable or disable tracing for sets of categories. Instances are created using the <code>trace_events.createTracing()</code> method.</p> <p>When created, the <code>Tracing</code> object is disabled. Calling the <code>tracing.enable()</code> method adds the categories to the set of enabled trace event categories. Calling <code>tracing.disable()</code> will remove the categories from the set of enabled trace event categories.</p> <h5><code>tracing.categories</code><span><a class="mark" href="#tracingcategories" id="tracingcategories">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_categories"></a></h5> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> </ul> <p>A comma-separated list of the trace event categories covered by this <code>Tracing</code> object.</p> <h5><code>tracing.disable()</code><span><a class="mark" href="#tracingdisable" id="tracingdisable">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_disable"></a></h5> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><p>Disables this <code>Tracing</code> object.</p> <p>Only trace event categories <em>not</em> covered by other enabled <code>Tracing</code> objects and <em>not</em> specified by the <code>--trace-event-categories</code> flag will be disabled.</p> <pre><code class="language-js">const trace_events = require('node:trace_events'); const t1 = trace_events.createTracing({ categories: ['node', 'v8'] }); const t2 = trace_events.createTracing({ categories: ['node.perf', 'node'] }); t1.enable(); t2.enable(); // Prints 'node,node.perf,v8' console.log(trace_events.getEnabledCategories()); t2.disable(); // Will only disable emission of the 'node.perf' category // Prints 'node,v8' console.log(trace_events.getEnabledCategories()); </code></pre> <h5><code>tracing.enable()</code><span><a class="mark" href="#tracingenable" id="tracingenable">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_enable"></a></h5> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><p>Enables this <code>Tracing</code> object for the set of categories covered by the <code>Tracing</code> object.</p> <h5><code>tracing.enabled</code><span><a class="mark" href="#tracingenabled" id="tracingenabled">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_enabled"></a></h5> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> <code>true</code> only if the <code>Tracing</code> object has been enabled.</li> </ul> <h4><code>trace_events.createTracing(options)</code><span><a class="mark" href="#trace_eventscreatetracingoptions" id="trace_eventscreatetracingoptions">#</a></span><a aria-hidden="true" class="legacy" id="tracing_trace_events_createtracing_options"></a></h4> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><ul> <li><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a><ul> <li><code>categories</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string[]></a> An array of trace category names. Values included in the array are coerced to a string when possible. An error will be thrown if the value cannot be coerced.</li> </ul> </li> <li>Returns: <a href="tracing.html#tracing-object" class="type"><Tracing></a>.</li> </ul> <p>Creates and returns a <code>Tracing</code> object for the given set of <code>categories</code>.</p> <pre><code class="language-js">const trace_events = require('node:trace_events'); const categories = ['node.perf', 'node.async_hooks']; const tracing = trace_events.createTracing({ categories }); tracing.enable(); // do stuff tracing.disable(); </code></pre> <h4><code>trace_events.getEnabledCategories()</code><span><a class="mark" href="#trace_eventsgetenabledcategories" id="trace_eventsgetenabledcategories">#</a></span><a aria-hidden="true" class="legacy" id="tracing_trace_events_getenabledcategories"></a></h4> <div class="api_metadata"> <span>Added in: v10.0.0</span> </div><ul> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> </ul> <p>Returns a comma-separated list of all currently-enabled trace event categories. The current set of enabled trace event categories is determined by the <em>union</em> of all currently-enabled <code>Tracing</code> objects and any categories enabled using the <code>--trace-event-categories</code> flag.</p> <p>Given the file <code>test.js</code> below, the command <code>node --trace-event-categories node.perf test.js</code> will print <code>'node.async_hooks,node.perf'</code> to the console.</p> <pre><code class="language-js">const trace_events = require('node:trace_events'); const t1 = trace_events.createTracing({ categories: ['node.async_hooks'] }); const t2 = trace_events.createTracing({ categories: ['node.perf'] }); const t3 = trace_events.createTracing({ categories: ['v8'] }); t1.enable(); t2.enable(); console.log(trace_events.getEnabledCategories()); </code></pre> </section><section><h3>Examples<span><a class="mark" href="#examples" id="examples">#</a></span><a aria-hidden="true" class="legacy" id="tracing_examples"></a></h3> <h4>Collect trace events data by inspector<span><a class="mark" href="#collect-trace-events-data-by-inspector" id="collect-trace-events-data-by-inspector">#</a></span><a aria-hidden="true" class="legacy" id="tracing_collect_trace_events_data_by_inspector"></a></h4> <pre><code class="language-js">'use strict'; const { Session } = require('inspector'); const session = new Session(); session.connect(); function post(message, data) { return new Promise((resolve, reject) => { session.post(message, data, (err, result) => { if (err) reject(new Error(JSON.stringify(err))); else resolve(result); }); }); } async function collect() { const data = []; session.on('NodeTracing.dataCollected', (chunk) => data.push(chunk)); session.on('NodeTracing.tracingComplete', () => { // done }); const traceConfig = { includedCategories: ['v8'] }; await post('NodeTracing.start', { traceConfig }); // do something setTimeout(() => { post('NodeTracing.stop').then(() => { session.disconnect(); console.log(data); }); }, 1000); } collect(); </code></pre> </section> <!-- API END --> </div> </div> </div> </body> </html>