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1221cb0ef41Sopenharmony_ci <div class="picker"><div class="toc"><ul> 1231cb0ef41Sopenharmony_ci<li><span class="stability_2"><a href="#debugger">Debugger</a></span> 1241cb0ef41Sopenharmony_ci<ul> 1251cb0ef41Sopenharmony_ci<li><a href="#watchers">Watchers</a></li> 1261cb0ef41Sopenharmony_ci<li><a href="#command-reference">Command reference</a> 1271cb0ef41Sopenharmony_ci<ul> 1281cb0ef41Sopenharmony_ci<li><a href="#stepping">Stepping</a></li> 1291cb0ef41Sopenharmony_ci<li><a href="#breakpoints">Breakpoints</a></li> 1301cb0ef41Sopenharmony_ci<li><a href="#information">Information</a></li> 1311cb0ef41Sopenharmony_ci<li><a href="#execution-control">Execution control</a></li> 1321cb0ef41Sopenharmony_ci<li><a href="#various">Various</a></li> 1331cb0ef41Sopenharmony_ci</ul> 1341cb0ef41Sopenharmony_ci</li> 1351cb0ef41Sopenharmony_ci<li><a href="#advanced-usage">Advanced usage</a> 1361cb0ef41Sopenharmony_ci<ul> 1371cb0ef41Sopenharmony_ci<li><a href="#v8-inspector-integration-for-nodejs">V8 inspector integration for Node.js</a></li> 1381cb0ef41Sopenharmony_ci</ul> 1391cb0ef41Sopenharmony_ci</li> 1401cb0ef41Sopenharmony_ci</ul> 1411cb0ef41Sopenharmony_ci</li> 1421cb0ef41Sopenharmony_ci</ul></div></div> 1431cb0ef41Sopenharmony_ci </li> 1441cb0ef41Sopenharmony_ci 1451cb0ef41Sopenharmony_ci 1461cb0ef41Sopenharmony_ci <li class="picker-header"> 1471cb0ef41Sopenharmony_ci <a href="#"> 1481cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 1491cb0ef41Sopenharmony_ci Index 1501cb0ef41Sopenharmony_ci </a> 1511cb0ef41Sopenharmony_ci 1521cb0ef41Sopenharmony_ci <div class="picker"><ul> 1531cb0ef41Sopenharmony_ci<li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> 1541cb0ef41Sopenharmony_ci<li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> 1551cb0ef41Sopenharmony_ci 1561cb0ef41Sopenharmony_ci <li> 1571cb0ef41Sopenharmony_ci <a href="index.html">Index</a> 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2261cb0ef41Sopenharmony_ci<li><a href="https://github.com/nodejs/node" class="nav-https-github-com-nodejs-node">Code repository and issue tracker</a></li> 2271cb0ef41Sopenharmony_ci</ul></div> 2281cb0ef41Sopenharmony_ci </li> 2291cb0ef41Sopenharmony_ci 2301cb0ef41Sopenharmony_ci 2311cb0ef41Sopenharmony_ci <li class="picker-header"> 2321cb0ef41Sopenharmony_ci <a href="#"> 2331cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 2341cb0ef41Sopenharmony_ci Other versions 2351cb0ef41Sopenharmony_ci </a> 2361cb0ef41Sopenharmony_ci <div class="picker"><ol id="alt-docs"><li><a href="https://nodejs.org/docs/latest-v21.x/api/debugger.html">21.x</a></li> 2371cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v20.x/api/debugger.html">20.x <b>LTS</b></a></li> 2381cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v19.x/api/debugger.html">19.x</a></li> 2391cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v18.x/api/debugger.html">18.x <b>LTS</b></a></li> 2401cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v17.x/api/debugger.html">17.x</a></li> 2411cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v16.x/api/debugger.html">16.x</a></li> 2421cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v15.x/api/debugger.html">15.x</a></li> 2431cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v14.x/api/debugger.html">14.x</a></li> 2441cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v13.x/api/debugger.html">13.x</a></li> 2451cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v12.x/api/debugger.html">12.x</a></li> 2461cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v11.x/api/debugger.html">11.x</a></li> 2471cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v10.x/api/debugger.html">10.x</a></li> 2481cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v9.x/api/debugger.html">9.x</a></li> 2491cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v8.x/api/debugger.html">8.x</a></li> 2501cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v7.x/api/debugger.html">7.x</a></li> 2511cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v6.x/api/debugger.html">6.x</a></li> 2521cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v5.x/api/debugger.html">5.x</a></li> 2531cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v4.x/api/debugger.html">4.x</a></li> 2541cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v0.12.x/api/debugger.html">0.12.x</a></li> 2551cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v0.10.x/api/debugger.html">0.10.x</a></li></ol></div> 2561cb0ef41Sopenharmony_ci </li> 2571cb0ef41Sopenharmony_ci 2581cb0ef41Sopenharmony_ci <li class="picker-header"> 2591cb0ef41Sopenharmony_ci <a href="#"> 2601cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 2611cb0ef41Sopenharmony_ci Options 2621cb0ef41Sopenharmony_ci </a> 2631cb0ef41Sopenharmony_ci 2641cb0ef41Sopenharmony_ci <div class="picker"> 2651cb0ef41Sopenharmony_ci <ul> 2661cb0ef41Sopenharmony_ci <li> 2671cb0ef41Sopenharmony_ci <a href="all.html">View on single page</a> 2681cb0ef41Sopenharmony_ci </li> 2691cb0ef41Sopenharmony_ci <li> 2701cb0ef41Sopenharmony_ci <a href="debugger.json">View as JSON</a> 2711cb0ef41Sopenharmony_ci </li> 2721cb0ef41Sopenharmony_ci <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/debugger.md">Edit on GitHub</a></li> 2731cb0ef41Sopenharmony_ci </ul> 2741cb0ef41Sopenharmony_ci </div> 2751cb0ef41Sopenharmony_ci </li> 2761cb0ef41Sopenharmony_ci </ul> 2771cb0ef41Sopenharmony_ci </div> 2781cb0ef41Sopenharmony_ci <hr> 2791cb0ef41Sopenharmony_ci </header> 2801cb0ef41Sopenharmony_ci 2811cb0ef41Sopenharmony_ci <details id="toc" open><summary>Table of contents</summary><ul> 2821cb0ef41Sopenharmony_ci<li><span class="stability_2"><a href="#debugger">Debugger</a></span> 2831cb0ef41Sopenharmony_ci<ul> 2841cb0ef41Sopenharmony_ci<li><a href="#watchers">Watchers</a></li> 2851cb0ef41Sopenharmony_ci<li><a href="#command-reference">Command reference</a> 2861cb0ef41Sopenharmony_ci<ul> 2871cb0ef41Sopenharmony_ci<li><a href="#stepping">Stepping</a></li> 2881cb0ef41Sopenharmony_ci<li><a href="#breakpoints">Breakpoints</a></li> 2891cb0ef41Sopenharmony_ci<li><a href="#information">Information</a></li> 2901cb0ef41Sopenharmony_ci<li><a href="#execution-control">Execution control</a></li> 2911cb0ef41Sopenharmony_ci<li><a href="#various">Various</a></li> 2921cb0ef41Sopenharmony_ci</ul> 2931cb0ef41Sopenharmony_ci</li> 2941cb0ef41Sopenharmony_ci<li><a href="#advanced-usage">Advanced usage</a> 2951cb0ef41Sopenharmony_ci<ul> 2961cb0ef41Sopenharmony_ci<li><a href="#v8-inspector-integration-for-nodejs">V8 inspector integration for Node.js</a></li> 2971cb0ef41Sopenharmony_ci</ul> 2981cb0ef41Sopenharmony_ci</li> 2991cb0ef41Sopenharmony_ci</ul> 3001cb0ef41Sopenharmony_ci</li> 3011cb0ef41Sopenharmony_ci</ul></details> 3021cb0ef41Sopenharmony_ci 3031cb0ef41Sopenharmony_ci <div id="apicontent"> 3041cb0ef41Sopenharmony_ci <h2>Debugger<span><a class="mark" href="#debugger" id="debugger">#</a></span><a aria-hidden="true" class="legacy" id="debugger_debugger"></a></h2> 3051cb0ef41Sopenharmony_ci 3061cb0ef41Sopenharmony_ci<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p> 3071cb0ef41Sopenharmony_ci 3081cb0ef41Sopenharmony_ci<p>Node.js includes a command-line debugging utility. The Node.js debugger client 3091cb0ef41Sopenharmony_ciis not a full-featured debugger, but simple stepping and inspection are 3101cb0ef41Sopenharmony_cipossible.</p> 3111cb0ef41Sopenharmony_ci<p>To use it, start Node.js with the <code>inspect</code> argument followed by the path to the 3121cb0ef41Sopenharmony_ciscript to debug.</p> 3131cb0ef41Sopenharmony_ci<pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">node inspect myscript.js</span> 3141cb0ef41Sopenharmony_ci< Debugger listening on ws://127.0.0.1:9229/621111f9-ffcb-4e82-b718-48a145fa5db8 3151cb0ef41Sopenharmony_ci< For help, see: https://nodejs.org/en/docs/inspector 3161cb0ef41Sopenharmony_ci< 3171cb0ef41Sopenharmony_ciconnecting to 127.0.0.1:9229 ... ok 3181cb0ef41Sopenharmony_ci< Debugger attached. 3191cb0ef41Sopenharmony_ci< 3201cb0ef41Sopenharmony_ci ok 3211cb0ef41Sopenharmony_ciBreak on start in myscript.js:2 3221cb0ef41Sopenharmony_ci 1 // myscript.js 3231cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">2 global.x = 5;</span> 3241cb0ef41Sopenharmony_ci 3 setTimeout(() => { 3251cb0ef41Sopenharmony_ci 4 debugger; 3261cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug></span></code> <button class="copy-button">copy</button></pre> 3271cb0ef41Sopenharmony_ci<p>The debugger automatically breaks on the first executable line. To instead 3281cb0ef41Sopenharmony_cirun until the first breakpoint (specified by a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/debugger"><code>debugger</code></a> statement), set 3291cb0ef41Sopenharmony_cithe <code>NODE_INSPECT_RESUME_ON_START</code> environment variable to <code>1</code>.</p> 3301cb0ef41Sopenharmony_ci<pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash"><span class="hljs-built_in">cat</span> myscript.js</span> 3311cb0ef41Sopenharmony_ci// myscript.js 3321cb0ef41Sopenharmony_ciglobal.x = 5; 3331cb0ef41Sopenharmony_cisetTimeout(() => { 3341cb0ef41Sopenharmony_ci debugger; 3351cb0ef41Sopenharmony_ci console.log('world'); 3361cb0ef41Sopenharmony_ci}, 1000); 3371cb0ef41Sopenharmony_ciconsole.log('hello'); 3381cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">$ </span><span class="language-bash">NODE_INSPECT_RESUME_ON_START=1 node inspect myscript.js</span> 3391cb0ef41Sopenharmony_ci< Debugger listening on ws://127.0.0.1:9229/f1ed133e-7876-495b-83ae-c32c6fc319c2 3401cb0ef41Sopenharmony_ci< For help, see: https://nodejs.org/en/docs/inspector 3411cb0ef41Sopenharmony_ci< 3421cb0ef41Sopenharmony_ciconnecting to 127.0.0.1:9229 ... ok 3431cb0ef41Sopenharmony_ci< Debugger attached. 3441cb0ef41Sopenharmony_ci< 3451cb0ef41Sopenharmony_ci< hello 3461cb0ef41Sopenharmony_ci< 3471cb0ef41Sopenharmony_cibreak in myscript.js:4 3481cb0ef41Sopenharmony_ci 2 global.x = 5; 3491cb0ef41Sopenharmony_ci 3 setTimeout(() => { 3501cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">4 debugger;</span> 3511cb0ef41Sopenharmony_ci 5 console.log('world'); 3521cb0ef41Sopenharmony_ci 6 }, 1000); 3531cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">next</span> 3541cb0ef41Sopenharmony_cibreak in myscript.js:5 3551cb0ef41Sopenharmony_ci 3 setTimeout(() => { 3561cb0ef41Sopenharmony_ci 4 debugger; 3571cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">5 console.log(<span class="hljs-string">'world'</span>);</span> 3581cb0ef41Sopenharmony_ci 6 }, 1000); 3591cb0ef41Sopenharmony_ci 7 console.log('hello'); 3601cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">repl</span> 3611cb0ef41Sopenharmony_ciPress Ctrl+C to leave debug repl 3621cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">x</span> 3631cb0ef41Sopenharmony_ci5 3641cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">2 + 2</span> 3651cb0ef41Sopenharmony_ci4 3661cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">next</span> 3671cb0ef41Sopenharmony_ci< world 3681cb0ef41Sopenharmony_ci< 3691cb0ef41Sopenharmony_cibreak in myscript.js:6 3701cb0ef41Sopenharmony_ci 4 debugger; 3711cb0ef41Sopenharmony_ci 5 console.log('world'); 3721cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">6 }, 1000);</span> 3731cb0ef41Sopenharmony_ci 7 console.log('hello'); 3741cb0ef41Sopenharmony_ci 8 3751cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">.<span class="hljs-built_in">exit</span></span> 3761cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">$</span></code> <button class="copy-button">copy</button></pre> 3771cb0ef41Sopenharmony_ci<p>The <code>repl</code> command allows code to be evaluated remotely. The <code>next</code> command 3781cb0ef41Sopenharmony_cisteps to the next line. Type <code>help</code> to see what other commands are available.</p> 3791cb0ef41Sopenharmony_ci<p>Pressing <code>enter</code> without typing a command will repeat the previous debugger 3801cb0ef41Sopenharmony_cicommand.</p> 3811cb0ef41Sopenharmony_ci<section><h3>Watchers<span><a class="mark" href="#watchers" id="watchers">#</a></span><a aria-hidden="true" class="legacy" id="debugger_watchers"></a></h3> 3821cb0ef41Sopenharmony_ci<p>It is possible to watch expression and variable values while debugging. On 3831cb0ef41Sopenharmony_cievery breakpoint, each expression from the watchers list will be evaluated 3841cb0ef41Sopenharmony_ciin the current context and displayed immediately before the breakpoint's 3851cb0ef41Sopenharmony_cisource code listing.</p> 3861cb0ef41Sopenharmony_ci<p>To begin watching an expression, type <code>watch('my_expression')</code>. The command 3871cb0ef41Sopenharmony_ci<code>watchers</code> will print the active watchers. To remove a watcher, type 3881cb0ef41Sopenharmony_ci<code>unwatch('my_expression')</code>.</p> 3891cb0ef41Sopenharmony_ci</section><section><h3>Command reference<span><a class="mark" href="#command-reference" id="command-reference">#</a></span><a aria-hidden="true" class="legacy" id="debugger_command_reference"></a></h3> 3901cb0ef41Sopenharmony_ci<h4>Stepping<span><a class="mark" href="#stepping" id="stepping">#</a></span><a aria-hidden="true" class="legacy" id="debugger_stepping"></a></h4> 3911cb0ef41Sopenharmony_ci<ul> 3921cb0ef41Sopenharmony_ci<li><code>cont</code>, <code>c</code>: Continue execution</li> 3931cb0ef41Sopenharmony_ci<li><code>next</code>, <code>n</code>: Step next</li> 3941cb0ef41Sopenharmony_ci<li><code>step</code>, <code>s</code>: Step in</li> 3951cb0ef41Sopenharmony_ci<li><code>out</code>, <code>o</code>: Step out</li> 3961cb0ef41Sopenharmony_ci<li><code>pause</code>: Pause running code (like pause button in Developer Tools)</li> 3971cb0ef41Sopenharmony_ci</ul> 3981cb0ef41Sopenharmony_ci<h4>Breakpoints<span><a class="mark" href="#breakpoints" id="breakpoints">#</a></span><a aria-hidden="true" class="legacy" id="debugger_breakpoints"></a></h4> 3991cb0ef41Sopenharmony_ci<ul> 4001cb0ef41Sopenharmony_ci<li><code>setBreakpoint()</code>, <code>sb()</code>: Set breakpoint on current line</li> 4011cb0ef41Sopenharmony_ci<li><code>setBreakpoint(line)</code>, <code>sb(line)</code>: Set breakpoint on specific line</li> 4021cb0ef41Sopenharmony_ci<li><code>setBreakpoint('fn()')</code>, <code>sb(...)</code>: Set breakpoint on a first statement in 4031cb0ef41Sopenharmony_cifunction's body</li> 4041cb0ef41Sopenharmony_ci<li><code>setBreakpoint('script.js', 1)</code>, <code>sb(...)</code>: Set breakpoint on first line of 4051cb0ef41Sopenharmony_ci<code>script.js</code></li> 4061cb0ef41Sopenharmony_ci<li><code>setBreakpoint('script.js', 1, 'num < 4')</code>, <code>sb(...)</code>: Set conditional 4071cb0ef41Sopenharmony_cibreakpoint on first line of <code>script.js</code> that only breaks when <code>num < 4</code> 4081cb0ef41Sopenharmony_cievaluates to <code>true</code></li> 4091cb0ef41Sopenharmony_ci<li><code>clearBreakpoint('script.js', 1)</code>, <code>cb(...)</code>: Clear breakpoint in <code>script.js</code> 4101cb0ef41Sopenharmony_cion line 1</li> 4111cb0ef41Sopenharmony_ci</ul> 4121cb0ef41Sopenharmony_ci<p>It is also possible to set a breakpoint in a file (module) that 4131cb0ef41Sopenharmony_ciis not loaded yet:</p> 4141cb0ef41Sopenharmony_ci<pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">node inspect main.js</span> 4151cb0ef41Sopenharmony_ci< Debugger listening on ws://127.0.0.1:9229/48a5b28a-550c-471b-b5e1-d13dd7165df9 4161cb0ef41Sopenharmony_ci< For help, see: https://nodejs.org/en/docs/inspector 4171cb0ef41Sopenharmony_ci< 4181cb0ef41Sopenharmony_ciconnecting to 127.0.0.1:9229 ... ok 4191cb0ef41Sopenharmony_ci< Debugger attached. 4201cb0ef41Sopenharmony_ci< 4211cb0ef41Sopenharmony_ciBreak on start in main.js:1 4221cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">1 const mod = require(<span class="hljs-string">'./mod.js'</span>);</span> 4231cb0ef41Sopenharmony_ci 2 mod.hello(); 4241cb0ef41Sopenharmony_ci 3 mod.hello(); 4251cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">setBreakpoint(<span class="hljs-string">'mod.js'</span>, 22)</span> 4261cb0ef41Sopenharmony_ciWarning: script 'mod.js' was not loaded yet. 4271cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">c</span> 4281cb0ef41Sopenharmony_cibreak in mod.js:22 4291cb0ef41Sopenharmony_ci 20 // USE OR OTHER DEALINGS IN THE SOFTWARE. 4301cb0ef41Sopenharmony_ci 21 4311cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">></span><span class="language-bash">22 exports.hello = <span class="hljs-function"><span class="hljs-title">function</span></span>() {</span> 4321cb0ef41Sopenharmony_ci 23 return 'hello from module'; 4331cb0ef41Sopenharmony_ci 24 }; 4341cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug></span></code> <button class="copy-button">copy</button></pre> 4351cb0ef41Sopenharmony_ci<p>It is also possible to set a conditional breakpoint that only breaks when a 4361cb0ef41Sopenharmony_cigiven expression evaluates to <code>true</code>:</p> 4371cb0ef41Sopenharmony_ci<pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">node inspect main.js</span> 4381cb0ef41Sopenharmony_ci< Debugger listening on ws://127.0.0.1:9229/ce24daa8-3816-44d4-b8ab-8273c8a66d35 4391cb0ef41Sopenharmony_ci< For help, see: https://nodejs.org/en/docs/inspector 4401cb0ef41Sopenharmony_ci< 4411cb0ef41Sopenharmony_ciconnecting to 127.0.0.1:9229 ... ok 4421cb0ef41Sopenharmony_ci< Debugger attached. 4431cb0ef41Sopenharmony_ciBreak on start in main.js:7 4441cb0ef41Sopenharmony_ci 5 } 4451cb0ef41Sopenharmony_ci 6 4461cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">7 addOne(10);</span> 4471cb0ef41Sopenharmony_ci 8 addOne(-1); 4481cb0ef41Sopenharmony_ci 9 4491cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">setBreakpoint(<span class="hljs-string">'main.js'</span>, 4, <span class="hljs-string">'num < 0'</span>)</span> 4501cb0ef41Sopenharmony_ci 1 'use strict'; 4511cb0ef41Sopenharmony_ci 2 4521cb0ef41Sopenharmony_ci 3 function addOne(num) { 4531cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">4 <span class="hljs-built_in">return</span> num + 1;</span> 4541cb0ef41Sopenharmony_ci 5 } 4551cb0ef41Sopenharmony_ci 6 4561cb0ef41Sopenharmony_ci 7 addOne(10); 4571cb0ef41Sopenharmony_ci 8 addOne(-1); 4581cb0ef41Sopenharmony_ci 9 4591cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash">cont</span> 4601cb0ef41Sopenharmony_cibreak in main.js:4 4611cb0ef41Sopenharmony_ci 2 4621cb0ef41Sopenharmony_ci 3 function addOne(num) { 4631cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">> </span><span class="language-bash">4 <span class="hljs-built_in">return</span> num + 1;</span> 4641cb0ef41Sopenharmony_ci 5 } 4651cb0ef41Sopenharmony_ci 6 4661cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug> </span><span class="language-bash"><span class="hljs-built_in">exec</span>(<span class="hljs-string">'num'</span>)</span> 4671cb0ef41Sopenharmony_ci-1 4681cb0ef41Sopenharmony_ci<span class="hljs-meta prompt_">debug></span></code> <button class="copy-button">copy</button></pre> 4691cb0ef41Sopenharmony_ci<h4>Information<span><a class="mark" href="#information" id="information">#</a></span><a aria-hidden="true" class="legacy" id="debugger_information"></a></h4> 4701cb0ef41Sopenharmony_ci<ul> 4711cb0ef41Sopenharmony_ci<li><code>backtrace</code>, <code>bt</code>: Print backtrace of current execution frame</li> 4721cb0ef41Sopenharmony_ci<li><code>list(5)</code>: List scripts source code with 5 line context (5 lines before and 4731cb0ef41Sopenharmony_ciafter)</li> 4741cb0ef41Sopenharmony_ci<li><code>watch(expr)</code>: Add expression to watch list</li> 4751cb0ef41Sopenharmony_ci<li><code>unwatch(expr)</code>: Remove expression from watch list</li> 4761cb0ef41Sopenharmony_ci<li><code>unwatch(index)</code>: Remove expression at specific index from watch list</li> 4771cb0ef41Sopenharmony_ci<li><code>watchers</code>: List all watchers and their values (automatically listed on each 4781cb0ef41Sopenharmony_cibreakpoint)</li> 4791cb0ef41Sopenharmony_ci<li><code>repl</code>: Open debugger's repl for evaluation in debugging script's context</li> 4801cb0ef41Sopenharmony_ci<li><code>exec expr</code>, <code>p expr</code>: Execute an expression in debugging script's context and 4811cb0ef41Sopenharmony_ciprint its value</li> 4821cb0ef41Sopenharmony_ci<li><code>profile</code>: Start CPU profiling session</li> 4831cb0ef41Sopenharmony_ci<li><code>profileEnd</code>: Stop current CPU profiling session</li> 4841cb0ef41Sopenharmony_ci<li><code>profiles</code>: List all completed CPU profiling sessions</li> 4851cb0ef41Sopenharmony_ci<li><code>profiles[n].save(filepath = 'node.cpuprofile')</code>: Save CPU profiling session 4861cb0ef41Sopenharmony_cito disk as JSON</li> 4871cb0ef41Sopenharmony_ci<li><code>takeHeapSnapshot(filepath = 'node.heapsnapshot')</code>: Take a heap snapshot 4881cb0ef41Sopenharmony_ciand save to disk as JSON</li> 4891cb0ef41Sopenharmony_ci</ul> 4901cb0ef41Sopenharmony_ci<h4>Execution control<span><a class="mark" href="#execution-control" id="execution-control">#</a></span><a aria-hidden="true" class="legacy" id="debugger_execution_control"></a></h4> 4911cb0ef41Sopenharmony_ci<ul> 4921cb0ef41Sopenharmony_ci<li><code>run</code>: Run script (automatically runs on debugger's start)</li> 4931cb0ef41Sopenharmony_ci<li><code>restart</code>: Restart script</li> 4941cb0ef41Sopenharmony_ci<li><code>kill</code>: Kill script</li> 4951cb0ef41Sopenharmony_ci</ul> 4961cb0ef41Sopenharmony_ci<h4>Various<span><a class="mark" href="#various" id="various">#</a></span><a aria-hidden="true" class="legacy" id="debugger_various"></a></h4> 4971cb0ef41Sopenharmony_ci<ul> 4981cb0ef41Sopenharmony_ci<li><code>scripts</code>: List all loaded scripts</li> 4991cb0ef41Sopenharmony_ci<li><code>version</code>: Display V8's version</li> 5001cb0ef41Sopenharmony_ci</ul> 5011cb0ef41Sopenharmony_ci</section><section><h3>Advanced usage<span><a class="mark" href="#advanced-usage" id="advanced-usage">#</a></span><a aria-hidden="true" class="legacy" id="debugger_advanced_usage"></a></h3> 5021cb0ef41Sopenharmony_ci<h4>V8 inspector integration for Node.js<span><a class="mark" href="#v8-inspector-integration-for-nodejs" id="v8-inspector-integration-for-nodejs">#</a></span><a aria-hidden="true" class="legacy" id="debugger_v8_inspector_integration_for_node_js"></a></h4> 5031cb0ef41Sopenharmony_ci<p>V8 Inspector integration allows attaching Chrome DevTools to Node.js 5041cb0ef41Sopenharmony_ciinstances for debugging and profiling. It uses the 5051cb0ef41Sopenharmony_ci<a href="https://chromedevtools.github.io/devtools-protocol/">Chrome DevTools Protocol</a>.</p> 5061cb0ef41Sopenharmony_ci<p>V8 Inspector can be enabled by passing the <code>--inspect</code> flag when starting a 5071cb0ef41Sopenharmony_ciNode.js application. It is also possible to supply a custom port with that flag, 5081cb0ef41Sopenharmony_cie.g. <code>--inspect=9222</code> will accept DevTools connections on port 9222.</p> 5091cb0ef41Sopenharmony_ci<p>To break on the first line of the application code, pass the <code>--inspect-brk</code> 5101cb0ef41Sopenharmony_ciflag instead of <code>--inspect</code>.</p> 5111cb0ef41Sopenharmony_ci<pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">node --inspect index.js</span> 5121cb0ef41Sopenharmony_ciDebugger listening on ws://127.0.0.1:9229/dc9010dd-f8b8-4ac5-a510-c1a114ec7d29 5131cb0ef41Sopenharmony_ciFor help, see: https://nodejs.org/en/docs/inspector</code> <button class="copy-button">copy</button></pre> 5141cb0ef41Sopenharmony_ci<p>(In the example above, the UUID dc9010dd-f8b8-4ac5-a510-c1a114ec7d29 5151cb0ef41Sopenharmony_ciat the end of the URL is generated on the fly, it varies in different 5161cb0ef41Sopenharmony_cidebugging sessions.)</p> 5171cb0ef41Sopenharmony_ci<p>If the Chrome browser is older than 66.0.3345.0, 5181cb0ef41Sopenharmony_ciuse <code>inspector.html</code> instead of <code>js_app.html</code> in the above URL.</p> 5191cb0ef41Sopenharmony_ci<p>Chrome DevTools doesn't support debugging <a href="worker_threads.html">worker threads</a> yet. 5201cb0ef41Sopenharmony_ci<a href="https://github.com/GoogleChromeLabs/ndb/">ndb</a> can be used to debug them.</p></section> 5211cb0ef41Sopenharmony_ci <!-- API END --> 5221cb0ef41Sopenharmony_ci </div> 5231cb0ef41Sopenharmony_ci </div> 5241cb0ef41Sopenharmony_ci </div> 5251cb0ef41Sopenharmony_ci</body> 5261cb0ef41Sopenharmony_ci</html> 527