Browser JavaScript

On this page, we get you up and running with Sentry's SDK, so that it will automatically report errors and exceptions in your application.

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


Sentry captures data by using an SDK within your application’s runtime.

In order to get started using the Sentry JavaScript SDK, add the following code to the top of your application, before all other scripts:


The Loader Script allows you to configure some SDK features from the Sentry UI, without having to redeploy your application. The Loader Script documentation shows more information about how to use it.

Alternatively, you can also install the SDK via a package manager:

npm install --save @sentry/browser

If you're updating your Sentry SDK to the latest version, check out our migration guide to learn more about breaking changes.

If you are using our previous Browser Javascript SDK, you can access the legacy SDK documentation, until further notice.


Configuration should happen as early as possible in your application's lifecycle.

Once this is done, Sentry's JavaScript SDK captures all unhandled exceptions, transactions, and Session Replays, based on the sample rates set.

import * as Sentry from "@sentry/browser";

  dsn: "",

  // Alternatively, use `process.env.npm_package_version` for a dynamic release version
  // if your build tool supports it.
  release: "my-project-name@2.3.12",
  integrations: [
    new Sentry.BrowserTracing({
      // Set `tracePropagationTargets` to control for which URLs distributed tracing should be enabled
      tracePropagationTargets: ["localhost", /^https:\/\/yourserver\.io\/api/],
    new Sentry.Replay(),

  // Set tracesSampleRate to 1.0 to capture 100%
  // of transactions for performance monitoring.
  // We recommend adjusting this value in production
  tracesSampleRate: 1.0,

  // Capture Replay for 10% of all sessions,
  // plus for 100% of sessions with an error
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,


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


To view and resolve the recorded error, log into 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.

Add Readable Stack Traces to Errors

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

To fix this, head over to our source maps documentation where you'll learn how to upload source maps, so you can make sense of your stack traces.

Help improve this content
Our documentation is open source and available on GitHub. Your contributions are welcome, whether fixing a typo (drat!) to suggesting an update ("yeah, this would be better").