<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <meta name="nodejs.org:node-version" content="v16.20.0"> <title>Diagnostic report | Node.js v16.20.0 Documentation</title> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato:400,700,400italic&display=fallback"> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/hljs.css"> <link rel="canonical" href="https://nodejs.org/api/report.html"> <script async defer src="assets/api.js" type="text/javascript"></script> </head> <body class="alt apidoc" id="api-section-report"> <div id="content" class="clearfix"> <div id="column2" class="interior"> <div id="intro" class="interior"> <a href="/" 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 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<li><a href="https://nodejs.org/docs/latest-v16.x/api/report.html">16.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v15.x/api/report.html">15.x</a></li> <li><a href="https://nodejs.org/docs/latest-v14.x/api/report.html">14.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v13.x/api/report.html">13.x</a></li> <li><a href="https://nodejs.org/docs/latest-v12.x/api/report.html">12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v11.x/api/report.html">11.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="report.json">View as JSON</a> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/report.md">Edit on GitHub</a></li> </ul> </div> </li> </ul> </div> <hr> </header> <details id="toc" open><summary>Table of contents</summary><ul> <li><span class="stability_2"><a href="#diagnostic-report">Diagnostic report</a></span> <ul> <li><a href="#usage">Usage</a></li> <li><a href="#configuration">Configuration</a></li> <li><a href="#interaction-with-workers">Interaction with workers</a></li> </ul> </li> </ul></details> <div id="apicontent"> <h2>Diagnostic report<span><a class="mark" href="#diagnostic-report" id="diagnostic-report">#</a></span><a aria-hidden="true" class="legacy" id="report_diagnostic_report"></a></h2> <p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p> <p>Delivers a JSON-formatted diagnostic summary, written to a file.</p> <p>The report is intended for development, test, and production use, to capture and preserve information for problem determination. It includes JavaScript and native stack traces, heap statistics, platform information, resource usage etc. With the report option enabled, diagnostic reports can be triggered on unhandled exceptions, fatal errors and user signals, in addition to triggering programmatically through API calls.</p> <p>A complete example report that was generated on an uncaught exception is provided below for reference.</p> <pre><code class="language-json"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"header"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"reportVersion"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"event"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"exception"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"trigger"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Exception"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"filename"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"report.20181221.005011.8974.0.001.json"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"dumpEventTime"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2018-12-21T00:50:11Z"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"dumpEventTimeStamp"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1545371411331"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"processId"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">8974</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"cwd"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/home/nodeuser/project/node"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"commandLine"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-string">"/home/nodeuser/project/node/out/Release/node"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"--report-uncaught-exception"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/home/nodeuser/project/node/test/report/test-exception.js"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"child"</span> <span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"nodejsVersion"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"v12.0.0-pre"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"glibcVersionRuntime"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2.17"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"glibcVersionCompiler"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2.17"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"wordSize"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"64 bit"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"arch"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"x64"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"platform"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"linux"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"componentVersions"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"node"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"12.0.0-pre"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"v8"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"7.1.302.28-node.5"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"uv"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.24.1"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"zlib"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.2.11"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"ares"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.15.0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"modules"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"68"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"nghttp2"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.34.0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"napi"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"3"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"llhttp"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.0.1"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"openssl"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.1.0j"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"release"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"node"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"osName"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Linux"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"osRelease"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"3.10.0-862.el7.x86_64"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"osVersion"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"#1 SMP Wed Mar 21 18:14:51 EDT 2018"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"osMachine"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"x86_64"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"cpus"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"model"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"speed"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">2700</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"user"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">88902660</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"nice"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sys"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">50902570</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"idle"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">241732220</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"irq"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"model"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"speed"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">2700</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"user"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">88902660</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"nice"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sys"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">50902570</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"idle"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">241732220</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"irq"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"networkInterfaces"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"en0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"internal"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"mac"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"13:10:de:ad:be:ef"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"10.0.0.37"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"netmask"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"255.255.255.0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"family"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"IPv4"</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"host"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"test_machine"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"javascriptStack"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"message"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Error: *** test-exception.js: throwing uncaught Error"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"stack"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-string">"at myException (/home/nodeuser/project/node/test/report/test-exception.js:9:11)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at Object.<anonymous> (/home/nodeuser/project/node/test/report/test-exception.js:12:3)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at Module._compile (internal/modules/cjs/loader.js:718:30)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at Object.Module._extensions..js (internal/modules/cjs/loader.js:729:10)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at Module.load (internal/modules/cjs/loader.js:617:32)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at tryModuleLoad (internal/modules/cjs/loader.js:560:12)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at Function.Module._load (internal/modules/cjs/loader.js:552:3)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at Function.Module.runMain (internal/modules/cjs/loader.js:771:12)"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"at executeUserCode (internal/bootstrap/node.js:332:15)"</span> <span class="hljs-punctuation">]</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"nativeStack"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"pc"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b57f07a9ef"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"symbol"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"report::GetNodeReport(v8::Isolate*, node::Environment*, char const*, char const*, v8::Local<v8::String>, std::ostream&) [./node]"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"pc"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b57f07cf03"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"symbol"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"report::GetReport(v8::FunctionCallbackInfo<v8::Value> const&) [./node]"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"pc"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b57f1bccfd"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"symbol"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">" [./node]"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"pc"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b57f1be048"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"symbol"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [./node]"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"pc"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b57feeda0e"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"symbol"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">" [./node]"</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"javascriptHeap"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"totalMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">5660672</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"executableMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">524288</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"totalCommittedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">5488640</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"availableMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4341379928</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"totalGlobalHandlesMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">8192</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"usedGlobalHandlesMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">3136</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"usedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4816432</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"memoryLimit"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4345298944</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"mallocedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">254128</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"externalMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">315644</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"peakMallocedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">98752</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"nativeContextCount"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"detachedContextCount"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"doesZapGarbage"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"heapSpaces"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"read_only_space"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"memorySize"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">524288</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"committedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">39208</span><span class="hljs-punctuation">,</span> <span 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class="hljs-attr">"capacity"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1974640</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"used"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1725488</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"available"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">249152</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"code_space"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"memorySize"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">696320</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"committedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">184896</span><span class="hljs-punctuation">,</span> <span 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class="hljs-attr">"capacity"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">327520</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"used"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">327520</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"available"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"large_object_space"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"memorySize"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"committedMemory"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span 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class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x00007fff5fbfeab0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"repeat"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"firesInMsFromNow"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">94403548320796</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"expired"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"check"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x00007fff5fbfeb48"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"idle"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x00007fff5fbfebc0"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"prepare"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x00007fff5fbfec38"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"check"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x00007fff5fbfecb0"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"async"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000000010188f2e0"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"tty"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b581db0e18"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"width"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">204</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"height"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">55</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"fd"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">17</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"writeQueueSize"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"readable"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"writable"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"signal"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b581d80010"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"signum"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">28</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"signal"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"SIGWINCH"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"tty"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_referenced"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055b581df59f8"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"width"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">204</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"height"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">55</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"fd"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">19</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"writeQueueSize"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"readable"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"writable"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"loop"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"is_active"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"address"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0x000055fc7b2cb180"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"loopIdleTimeSeconds"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">22644.8</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"workers"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"environmentVariables"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"REMOTEHOST"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"REMOVED"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"MANPATH"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/usr/share/man:"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"XDG_SESSION_ID"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"66126"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"HOSTNAME"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"test_machine"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"HOST"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"test_machine"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"TERM"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"xterm-256color"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"SHELL"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/bin/csh"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"SSH_CLIENT"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"REMOVED"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"PERL5LIB"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root//usr/lib64/perl5/vendor_perl:/opt/rh/devtoolset-3/root/usr/lib/perl5:/opt/rh/devtoolset-3/root//usr/share/perl5/vendor_perl"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"OLDPWD"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/home/nodeuser/project/node/src"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"JAVACONFDIRS"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/etc/java:/etc/java"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"SSH_TTY"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/dev/pts/0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"PCP_DIR"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"GROUP"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"normaluser"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"USER"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"nodeuser"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"LD_LIBRARY_PATH"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/usr/lib64:/opt/rh/devtoolset-3/root/usr/lib"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"HOSTTYPE"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"x86_64-linux"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"XDG_CONFIG_DIRS"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/etc/xdg:/etc/xdg"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"MAIL"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/var/spool/mail/nodeuser"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"PATH"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/home/nodeuser/project/node:/opt/rh/devtoolset-3/root/usr/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"PWD"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/home/nodeuser/project/node"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"LANG"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"en_US.UTF-8"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"PS1"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"\\u@\\h : \\[\\e[31m\\]\\w\\[\\e[m\\] > "</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"SHLVL"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"HOME"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/home/nodeuser"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"OSTYPE"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"linux"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"VENDOR"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unknown"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"PYTHONPATH"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/usr/lib64/python2.7/site-packages:/opt/rh/devtoolset-3/root/usr/lib/python2.7/site-packages"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"MACHTYPE"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"x86_64"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"LOGNAME"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"nodeuser"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"XDG_DATA_DIRS"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/usr/share:/usr/local/share:/usr/share"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"LESSOPEN"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"||/usr/bin/lesspipe.sh %s"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"INFOPATH"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/opt/rh/devtoolset-3/root/usr/share/info"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"XDG_RUNTIME_DIR"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/run/user/50141"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"_"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"./node"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"userLimits"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"core_file_size_blocks"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">""</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"data_seg_size_kbytes"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"file_size_blocks"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"max_locked_memory_bytes"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">65536</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"max_memory_size_kbytes"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"open_files"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4096</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"stack_size_bytes"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"cpu_time_seconds"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"max_user_processes"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4127290</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"virtual_memory_kbytes"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"soft"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"hard"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"unlimited"</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sharedObjects"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-string">"/lib64/libdl.so.2"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/librt.so.1"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/libstdc++.so.6"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/libm.so.6"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/libgcc_s.so.1"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/libpthread.so.0"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/libc.so.6"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"/lib64/ld-linux-x86-64.so.2"</span> <span class="hljs-punctuation">]</span> <span class="hljs-punctuation">}</span></code></pre> <section><h3>Usage<span><a class="mark" href="#usage" id="usage">#</a></span><a aria-hidden="true" class="legacy" id="report_usage"></a></h3> <pre><code class="language-bash">node --report-uncaught-exception --report-on-signal \ --report-on-fatalerror app.js</code></pre> <ul> <li> <p><code>--report-uncaught-exception</code> Enables report to be generated on un-caught exceptions. Useful when inspecting JavaScript stack in conjunction with native stack and other runtime environment data.</p> </li> <li> <p><code>--report-on-signal</code> Enables report to be generated upon receiving the specified (or predefined) signal to the running Node.js process. (See below on how to modify the signal that triggers the report.) Default signal is <code>SIGUSR2</code>. Useful when a report needs to be triggered from another program. Application monitors may leverage this feature to collect report at regular intervals and plot rich set of internal runtime data to their views.</p> </li> </ul> <p>Signal based report generation is not supported in Windows.</p> <p>Under normal circumstances, there is no need to modify the report triggering signal. However, if <code>SIGUSR2</code> is already used for other purposes, then this flag helps to change the signal for report generation and preserve the original meaning of <code>SIGUSR2</code> for the said purposes.</p> <ul> <li> <p><code>--report-on-fatalerror</code> Enables the report to be triggered on fatal errors (internal errors within the Node.js runtime, such as out of memory) that leads to termination of the application. Useful to inspect various diagnostic data elements such as heap, stack, event loop state, resource consumption etc. to reason about the fatal error.</p> </li> <li> <p><code>--report-compact</code> Write reports in a compact format, single-line JSON, more easily consumable by log processing systems than the default multi-line format designed for human consumption.</p> </li> <li> <p><code>--report-directory</code> Location at which the report will be generated.</p> </li> <li> <p><code>--report-filename</code> Name of the file to which the report will be written.</p> </li> <li> <p><code>--report-signal</code> Sets or resets the signal for report generation (not supported on Windows). Default signal is <code>SIGUSR2</code>.</p> </li> </ul> <p>A report can also be triggered via an API call from a JavaScript application:</p> <pre><code class="language-js">process.<span class="hljs-property">report</span>.<span class="hljs-title function_">writeReport</span>();</code></pre> <p>This function takes an optional additional argument <code>filename</code>, which is the name of a file into which the report is written.</p> <pre><code class="language-js">process.<span class="hljs-property">report</span>.<span class="hljs-title function_">writeReport</span>(<span class="hljs-string">'./foo.json'</span>);</code></pre> <p>This function takes an optional additional argument <code>err</code> which is an <code>Error</code> object that will be used as the context for the JavaScript stack printed in the report. When using report to handle errors in a callback or an exception handler, this allows the report to include the location of the original error as well as where it was handled.</p> <pre><code class="language-js"><span class="hljs-keyword">try</span> { process.<span class="hljs-title function_">chdir</span>(<span class="hljs-string">'/non-existent-path'</span>); } <span class="hljs-keyword">catch</span> (err) { process.<span class="hljs-property">report</span>.<span class="hljs-title function_">writeReport</span>(err); } <span class="hljs-comment">// Any other code</span></code></pre> <p>If both filename and error object are passed to <code>writeReport()</code> the error object must be the second parameter.</p> <pre><code class="language-js"><span class="hljs-keyword">try</span> { process.<span class="hljs-title function_">chdir</span>(<span class="hljs-string">'/non-existent-path'</span>); } <span class="hljs-keyword">catch</span> (err) { process.<span class="hljs-property">report</span>.<span class="hljs-title function_">writeReport</span>(filename, err); } <span class="hljs-comment">// Any other code</span></code></pre> <p>The content of the diagnostic report can be returned as a JavaScript Object via an API call from a JavaScript application:</p> <pre><code class="language-js"><span class="hljs-keyword">const</span> report = process.<span class="hljs-property">report</span>.<span class="hljs-title function_">getReport</span>(); <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-keyword">typeof</span> report === <span class="hljs-string">'object'</span>); <span class="hljs-comment">// true</span> <span class="hljs-comment">// Similar to process.report.writeReport() output</span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>(report, <span class="hljs-literal">null</span>, <span class="hljs-number">2</span>));</code></pre> <p>This function takes an optional additional argument <code>err</code>, which is an <code>Error</code> object that will be used as the context for the JavaScript stack printed in the report.</p> <pre><code class="language-js"><span class="hljs-keyword">const</span> report = process.<span class="hljs-property">report</span>.<span class="hljs-title function_">getReport</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-string">'custom error'</span>)); <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-keyword">typeof</span> report === <span class="hljs-string">'object'</span>); <span class="hljs-comment">// true</span></code></pre> <p>The API versions are useful when inspecting the runtime state from within the application, in expectation of self-adjusting the resource consumption, load balancing, monitoring etc.</p> <p>The content of the report consists of a header section containing the event type, date, time, PID, and Node.js version, sections containing JavaScript and native stack traces, a section containing V8 heap information, a section containing <code>libuv</code> handle information, and an OS platform information section showing CPU and memory usage and system limits. An example report can be triggered using the Node.js REPL:</p> <pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">node</span> <span class="hljs-meta prompt_">> </span><span class="language-bash">process.report.writeReport();</span> Writing Node.js report to file: report.20181126.091102.8480.0.001.json Node.js report completed <span class="hljs-meta prompt_">></span></code></pre> <p>When a report is written, start and end messages are issued to stderr and the filename of the report is returned to the caller. The default filename includes the date, time, PID, and a sequence number. The sequence number helps in associating the report dump with the runtime state if generated multiple times for the same Node.js process.</p> </section><section><h3>Configuration<span><a class="mark" href="#configuration" id="configuration">#</a></span><a aria-hidden="true" class="legacy" id="report_configuration"></a></h3> <p>Additional runtime configuration of report generation is available via the following properties of <code>process.report</code>:</p> <p><code>reportOnFatalError</code> triggers diagnostic reporting on fatal errors when <code>true</code>. Defaults to <code>false</code>.</p> <p><code>reportOnSignal</code> triggers diagnostic reporting on signal when <code>true</code>. This is not supported on Windows. Defaults to <code>false</code>.</p> <p><code>reportOnUncaughtException</code> triggers diagnostic reporting on uncaught exception when <code>true</code>. Defaults to <code>false</code>.</p> <p><code>signal</code> specifies the POSIX signal identifier that will be used to intercept external triggers for report generation. Defaults to <code>'SIGUSR2'</code>.</p> <p><code>filename</code> specifies the name of the output file in the file system. Special meaning is attached to <code>stdout</code> and <code>stderr</code>. Usage of these will result in report being written to the associated standard streams. In cases where standard streams are used, the value in <code>directory</code> is ignored. URLs are not supported. Defaults to a composite filename that contains timestamp, PID, and sequence number.</p> <p><code>directory</code> specifies the filesystem directory where the report will be written. URLs are not supported. Defaults to the current working directory of the Node.js process.</p> <pre><code class="language-js"><span class="hljs-comment">// Trigger report only on uncaught exceptions.</span> process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnFatalError</span> = <span class="hljs-literal">false</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnSignal</span> = <span class="hljs-literal">false</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnUncaughtException</span> = <span class="hljs-literal">true</span>; <span class="hljs-comment">// Trigger report for both internal errors as well as external signal.</span> process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnFatalError</span> = <span class="hljs-literal">true</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnSignal</span> = <span class="hljs-literal">true</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnUncaughtException</span> = <span class="hljs-literal">false</span>; <span class="hljs-comment">// Change the default signal to 'SIGQUIT' and enable it.</span> process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnFatalError</span> = <span class="hljs-literal">false</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnUncaughtException</span> = <span class="hljs-literal">false</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">reportOnSignal</span> = <span class="hljs-literal">true</span>; process.<span class="hljs-property">report</span>.<span class="hljs-property">signal</span> = <span class="hljs-string">'SIGQUIT'</span>;</code></pre> <p>Configuration on module initialization is also available via environment variables:</p> <pre><code class="language-bash">NODE_OPTIONS=<span class="hljs-string">"--report-uncaught-exception \ --report-on-fatalerror --report-on-signal \ --report-signal=SIGUSR2 --report-filename=./report.json \ --report-directory=/home/nodeuser"</span></code></pre> <p>Specific API documentation can be found under <a href="process.html"><code>process API documentation</code></a> section.</p> </section><section><h3>Interaction with workers<span><a class="mark" href="#interaction-with-workers" id="interaction-with-workers">#</a></span><a aria-hidden="true" class="legacy" id="report_interaction_with_workers"></a></h3> <div class="api_metadata"> <details class="changelog"><summary>History</summary> <table> <tbody><tr><th>Version</th><th>Changes</th></tr> <tr><td>v13.9.0, v12.16.2</td> <td><p>Workers are now included in the report.</p></td></tr> </tbody></table> </details> </div> <p><a href="worker_threads.html"><code>Worker</code></a> threads can create reports in the same way that the main thread does.</p> <p>Reports will include information on any Workers that are children of the current thread as part of the <code>workers</code> section, with each Worker generating a report in the standard report format.</p> <p>The thread which is generating the report will wait for the reports from Worker threads to finish. However, the latency for this will usually be low, as both running JavaScript and the event loop are interrupted to generate the report.</p></section> <!-- API END --> </div> </div> </div> </body> </html>