Node.js

This guide explains how to set up Sentry in your Node.js application.

Don't already have an account and Sentry project established? Head over to sentry.io, then return to this page.

Install

Sentry captures data by using an SDK within your application’s runtime. This means that you have to add @sentry/node as a runtime dependency to your application:

npm install --save @sentry/node

npm install --save @sentry/node @sentry/profiling-node

Configure

Sentry should be initialized as early in your app as possible. It is essential that you call Sentry.init before you require any other modules in your application—otherwise, auto-instrumentation of these modules will not work.

Once this is done, Sentry's Node SDK captures unhandled exceptions as well as tracing data for your application.

You need to create a file named instrument.js that imports and initializes Sentry:

const Sentry = require("@sentry/node");
const { nodeProfilingIntegration } = require("@sentry/profiling-node");

// Ensure to call this before requiring any other modules!
Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
  integrations: [
    // Add our Profiling integration
    nodeProfilingIntegration(),
  ],

  // Add Performance Monitoring by setting tracesSampleRate
  // We recommend adjusting this value in production
  tracesSampleRate: 1.0,

  // Set sampling rate for profiling
  // This is relative to tracesSampleRate
  profilesSampleRate: 1.0,
});

Use

You need to require or import the instrument.js file before requiring any other modules in your application. This is necessary to ensure that Sentry can automatically instrument all modules in your application:

// Require this first!
require('./instrument');

// Now require other modules
const http = require('http');

// Your application code goes here

Add Readable Stack Traces to Errors

Depending on how you've set up your project, the stack traces in your Sentry errors probably don't look like your actual code.

To fix this, upload your source maps to Sentry. The easiest way to do this is to use the Sentry Wizard:

npx @sentry/wizard@latest -i sourcemaps

The wizard will guide you through the following steps:

• Logging into Sentry and selecting a project
• Installing the necessary Sentry packages
• Configuring your build tool to generate and upload source maps
• Configuring your CI to upload source maps

For more information on source maps or for more options to upload them, head over to our Source Maps documentation.

Verify

This snippet includes an intentional error, so you can test that everything is working as soon as you set it up.

Sentry.startSpan(
  {
    op: 'test',
    name: 'My First Test Transaction',
  },
  () => {
    setTimeout(() => {
      try {
        foo();
      } catch (e) {
        Sentry.captureException(e);
      }
    }, 99);
  }
);

To view and resolve the recorded error, log into sentry.io and open your project. Clicking on the error's title will open a page where you can see detailed information and mark it as resolved.