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Example Next.js 14 implementation of Firebase Auth on the client and server side

Getting Started

First, run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev

Open http://localhost:3000 with your browser to see the result.

You can start editing the page by modifying app/page.tsx.

Firebase setup

Setting environment variables:

Create a .env.local file with the following environment variables:

NEXT_PUBLIC_FIREBASE_API_KEY=
NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN=
NEXT_PUBLIC_FIREBASE_PROJECT_ID=
NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=

FIREBASE_SERVICE_ACCOUNT_KEY='{"type":"service_account","project_id":"...

You can get the values for the environment variables from the Firebase console. You will need to get the service account key from the Firebase console under project settings.

Client and server-side authentication

The client-side authentication is implemented using the Firebase SDK. The server-side authentication is implemented using the Firebase Admin SDK.

The client-side authentication is used to authenticate the user and get the ID token. The ID token is then sent to the server-side and used to authenticate the user.

The server-side authentication is used to create a session cookie and provide access in server components.

Middleware

The middleware.ts ensures that the user is authenticated before allowing access to server-side pages. Where a session is not detected, the user is redirected to the login page.

Context

The AuthContext.tsx provides a context for the authentication state and provides a signIn and signOut function.