Fastify

This guide explains how to setup Sentry in your Fastify 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@next

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.

const Sentry = require("@sentry/node");

// Ensure to call this before requiring any other modules!
Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",

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

const { fastify } = require("fastify");
const app = fastify();

Sentry.setupFastifyErrorHandler(app);

// Add your routes, etc.

app.listen({ port: 3030 });

If you set a tracesSampleRate, performance instrumentation will automatically be enabled for you. See Automatic Instrumentation to learn about all the things that the SDK automatically instruments for you.

You can also manually capture performance data - see Custom Instrumentation for details.

Using Sentry SDK with ESM

Instrumentation works out of the box for CommonJS (CJS) applications based on require() calls. This means that as long as your application is either natively in CJS, or compiled at build time to CJS (which is the case for most TypeScript apps, for example), everything will work without any further setup.

Because of compatibility issues, today the Sentry SDK does not support ESM (based on import). We are working on a solution for this, and hope to support this soon.

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.

app.get("/debug-sentry", function mainHandler(req, res) {
  throw new Error("My first Sentry error!");
});

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.