Source Maps

Learn how to enable readable stack traces in your Sentry errors.

To enable readable stack traces in your Sentry errors, you need to upload your source maps to Sentry.

Readable Stack Traces

This guide assumes you are using the @sentry/svelte SDK on version 7.47.0 or higher.

If you are on an older version and you want to upload source maps we recommend upgrading your SDK to the newest version.

The easiest way to configure uploading source maps is by using 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

If you want to configure source maps upload manually, follow the guide for your bundler or build tool below.

To generate source maps with your Svelte project, you need to set the source map compiler options in your Svelte config:

import sveltePreprocess from "svelte-preprocess";

const config = {
  compilerOptions: {
    enableSourcemap: true,
  preprocess: sveltePreprocess({
    sourceMap: true,

export default config;

If you're using Vite in you Svelte project, you can use Sentry's Vite plugin for convenience:

npm install @sentry/vite-plugin --save-dev

To upload source maps you have to configure an auth token. Auth tokens can be passed to the plugin explicitly with the authToken option, with a SENTRY_AUTH_TOKEN environment variable, or with a .env.sentry-build-plugin file in the working directory when building your project. You likely want to add the auth token as an environment variable to your CI/CD environment.


Configure Vite to emit source maps and use the Sentry Vite plugin:

import { defineConfig } from "vite";
import { svelte } from "@sveltejs/vite-plugin-svelte";
import { sentryVitePlugin } from "@sentry/vite-plugin";

export default defineConfig({
  build: {
    sourcemap: true, // Source map generation must be turned on
  plugins: [

    // Put the Sentry vite plugin after all other plugins
      org: "example-org",
      project: "example-project",
      authToken: process.env.SENTRY_AUTH_TOKEN,

The Sentry Vite plugin doesn't upload source maps in watch-mode/development-mode. We recommend running a production build to test your implementation.

If you're using a bundler other than Vite, check out our general guide on how to upload source maps, or refer to your bundler's documentation.

By default, if Sentry can't find the uploaded files it needs, it will attempt to download them from the URLs in the stack trace. To disable this, turn off "Enable JavaScript source fetching" in either your organization's "Security & Privacy" settings or your project's general settings.

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