Login with SvelteKit and Firebase (server side)

How to handle authentication with Firebase Auth in SvelteKit on server side.

It uses a sameSite httpOnly cookie to store the idToken from Firebase Auth. The token persists in $session via hooks and load function on page refresh.

Also, goto is used instead of window.location for navigate/redirect after logged in and logged out.

Note : Firebase SDKs are not used here, as I opted for Firebase REST API. Check endpoints in src/routes/auth/

Try Live Demo

email : mail@mail.com
password: mailmail

Developing

Once you've cloned the repo, start a development server:

npm install
npm run dev

# or start the server and open the app in a new browser tab
npm run dev -- --open

Then create your own Firebase project, copy its Web API and add it in .env file like this :

VITE_FIREBASE_WEB_API="REPLACE-WITH-YOUR-WEB-API"

Don't forget to add a user in Firebase Auth console.

Building

Before creating a production version of your app, install an adapter for your target environment. Then:

npm run build

You can preview the built app with npm run preview, regardless of whether you installed an adapter. This should not be used to serve your app in production.