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Official Sentry SDK for Cloudflare

Install

To get started, first install the @sentry/cloudflare package:

npm install @sentry/cloudflare

Then either set the nodejs_als or nodejs_compat compatibility flags in your wrangler.jsonc/wrangler.toml config. This is because the SDK needs access to the AsyncLocalStorage API to work correctly.

{
  "compatibility_flags": [
    "nodejs_als",
    // "nodejs_compat"
  ],
}

compatibility_flags = ["nodejs_als"]
# compatibility_flags = ["nodejs_compat"]

Setup (Cloudflare Pages)

To use this SDK, add the sentryPagesPlugin as middleware to your Cloudflare Pages application.

We recommend adding a functions/_middleware.js for the middleware setup so that Sentry is initialized for your entire app.

// functions/_middleware.js
import * as Sentry from '@sentry/cloudflare';

export const onRequest = Sentry.sentryPagesPlugin({
  dsn: process.env.SENTRY_DSN,
  // Set tracesSampleRate to 1.0 to capture 100% of spans for tracing.
  tracesSampleRate: 1.0,
});

If you need to to chain multiple middlewares, you can do so by exporting an array of middlewares. Make sure the Sentry middleware is the first one in the array.

import * as Sentry from '@sentry/cloudflare';

export const onRequest = [
  // Make sure Sentry is the first middleware
  Sentry.sentryPagesPlugin({
    dsn: process.env.SENTRY_DSN,
    tracesSampleRate: 1.0,
  }),
  // Add more middlewares here
];

If you need to access the context object (for example to grab environmental variables), you can pass a function to sentryPagesPlugin that takes the context object as an argument and returns init options:

export const onRequest = Sentry.sentryPagesPlugin(context => ({
  dsn: context.env.SENTRY_DSN,
  tracesSampleRate: 1.0,
}));

If you do not have access to the onRequest middleware API, you can use the wrapRequestHandler API instead.

Here is an example with SvelteKit:

// hooks.server.js
import * as Sentry from '@sentry/cloudflare';

export const handle = ({ event, resolve }) => {
  const requestHandlerOptions = {
    options: {
      dsn: event.platform.env.SENTRY_DSN,
      tracesSampleRate: 1.0,
    },
    request: event.request,
    context: event.platform.ctx,
  };
  return Sentry.wrapRequestHandler(requestHandlerOptions, () => resolve(event));
};

Setup (Cloudflare Workers)

To use this SDK, wrap your handler with the withSentry function. This will initialize the SDK and hook into the environment. Note that you can turn off almost all side effects using the respective options.

Currently only ESM handlers are supported.

import * as Sentry from '@sentry/cloudflare';

export default withSentry(
  env => ({
    dsn: env.SENTRY_DSN,
    // Set tracesSampleRate to 1.0 to capture 100% of spans for tracing.
    tracesSampleRate: 1.0,
  }),
  {
    async fetch(request, env, ctx) {
      return new Response('Hello World!');
    },
  } satisfies ExportedHandler<Env>,
);

Sourcemaps

Configure uploading sourcemaps via the Sentry Wizard:

npx @sentry/wizard@latest -i sourcemaps

See more details in our docs.

Usage

To set context information or send manual events, use the exported functions of @sentry/cloudflare. Note that these functions will require the usage of the Sentry helpers, either withSentry function for Cloudflare Workers or the sentryPagesPlugin middleware for Cloudflare Pages.

import * as Sentry from '@sentry/cloudflare';

// Set user information, as well as tags and further extras
Sentry.setExtra('battery', 0.7);
Sentry.setTag('user_mode', 'admin');
Sentry.setUser({ id: '4711' });

// Add a breadcrumb for future events
Sentry.addBreadcrumb({
  message: 'My Breadcrumb',
  // ...
});

// Capture exceptions, messages or manual events
Sentry.captureMessage('Hello, world!');
Sentry.captureException(new Error('Good bye'));
Sentry.captureEvent({
  message: 'Manual',
  stacktrace: [
    // ...
  ],
});

Cloudflare D1 Instrumentation

You can use the instrumentD1WithSentry method to instrument Cloudflare D1, Cloudflare's serverless SQL database with Sentry.

import * as Sentry from '@sentry/cloudflare';

// env.DB is the D1 DB binding configured in your `wrangler.toml`
const db = Sentry.instrumentD1WithSentry(env.DB);
// Now you can use the database as usual
await db.prepare('SELECT * FROM table WHERE id = ?').bind(1).run();

Cron Monitoring (Cloudflare Workers)

Sentry Crons allows you to monitor the uptime and performance of any scheduled, recurring job in your application.

To instrument your cron triggers, use the Sentry.withMonitor API in your Scheduled handler.

export default {
  async scheduled(event, env, ctx) {
    ctx.waitUntil(
      Sentry.withMonitor('your-cron-name', () => {
        return doSomeTaskOnASchedule();
      }),
    );
  },
};

You can also use supply a monitor config to upsert cron monitors with additional metadata:

const monitorConfig = {
  schedule: {
    type: 'crontab',
    value: '* * * * *',
  },
  checkinMargin: 2, // In minutes. Optional.
  maxRuntime: 10, // In minutes. Optional.
  timezone: 'America/Los_Angeles', // Optional.
};

export default {
  async scheduled(event, env, ctx) {
    Sentry.withMonitor('your-cron-name', () => doSomeTaskOnASchedule(), monitorConfig);
  },
};

Uh oh!