Star us on GitHub

Using with SvelteKit

Learn how to set up with your SvelteKit application.
Install the npm package & SDK.

Install the npm package in your terminal.

# with yarn yarn add
# with pnpm pnpm add
# with npm npm install
Initialize the SDK in your frontend.

In SvelteKit, we recommend initializing in the hooks.client.js or hooks.client.ts file. You can find more details about this file in the SvelteKit docs here. To get started, we recommend setting tracingOrigins and networkRecording so that we can pass a header to pair frontend and backend errors.

Grab your project ID from, and pass it as the first parameter of the H.init() method.

// hooks.client.ts ... import { H } from ''; H.init('<YOUR_PROJECT_ID>', { environment: 'production', version: 'commit:abcdefg12345', tracingOrigins: true, networkRecording: { enabled: true, recordHeadersAndBody: true, urlBlocklist: [ // insert full or partial urls that you don't want to record here // Out of the box, Highlight will not record these URLs (they can be safely removed): "", "", ], }, }); ...
Confirm CSS is served by absolute path.

SvelteKit may generate CSS paths that are relative which may interfere with our logic to fetch stylesheets. Update your svelte.config.js to disable relative paths. See the SvelteKit docs here for more details.

/** @type {import('@sveltejs/kit').Config} */ const config = { paths: { relative: false } }; export default config;
Identify users.

Identify users after the authentication flow of your web app. We recommend doing this in any asynchronous, client-side context.

The first argument of identify will be searchable via the property identifier, and the second property is searchable by the key of each item in the object.

For more details, read about session search or how to identify users.

import { H } from ''; function Login(username: string, password: string) { // login logic here... // pass the user details from your auth provider to the H.identify call H.identify('', { id: 'very-secure-id', phone: '867-5309', bestFriend: 'jenny' }); }
Verify installation

Check your dashboard for a new session. Don't see anything? Send us a message in our community and we can help debug.

Configure sourcemaps in CI. (optional)

To get properly enhanced stacktraces of your javascript app, we recommend instrumenting sourcemaps. If you deploy public sourcemaps, you can skip this step. Refer to our docs on sourcemaps to read more about this option.

# Upload sourcemaps to Highlight ... npx --yes @highlight-run/sourcemap-uploader upload --apiKey ${YOUR_ORG_API_KEY} --path ./build ...
Instrument your backend.

The next step is instrumenting your backend to tie logs/errors to your frontend sessions. Read more about this in our backend instrumentation section.