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Svelte

Sentry's Svelte SDK was introduced with version 7.10.0.

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 sentry.io, then return to this page.

Install

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

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npm install --save @sentry/svelte

Configure

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

To use the SDK, initialize it in your Svelte entry point before bootstrapping your app. In a typical Svelte project, that is your main.js or main.ts file.

main.ts
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import "./app.css";
import App from "./App.svelte";

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

// Initialize the Sentry SDK here
Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
  integrations: [new Sentry.BrowserTracing(), 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,
});

const app = new App({
  target: document.getElementById("app"),
});

export default app;

Once you've done this, the SDK will automatically capture unhandled errors and promise rejections, and monitor performance in the client. You can also manually capture errors.

Verify

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

SomeCmponent.svelte
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<button
  type="button"
  on:click={() => {
    throw new Error("Sentry Frontend Error");
  }}
>
  Throw error
</button>

This snippet adds a button that throws an error in a Svelte component.

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.

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").
Suggest an edit to this page   |  Contribute to Docs   |  Report a problem
Package:
npm:@sentry/svelte
Version:
7.56.0
Repository:
https://github.com/getsentry/sentry-javascript