Flutter Authentication with Firebase + JWT — The Full Flow
Firebase owns identity on the device. Your backend owns trust. The JWT is the bridge between the two. Most Flutter authentication tutorials stop at the happy path: the user signs in with Firebase, you redirect to the home screen, done. Then the app tries to call your own backend — a /api/orders or /api/profile endpoint — and the questions start. What does your server actually trust? How does it…
The article titled "Flutter Authentication with Firebase + JWT — The Full Flow" outlines a comprehensive authentication flow for Flutter applications using Firebase for identity and JWT for secure backend communication. It explains that Firebase handles user identity and sign-in on the device, while the backend is responsible for trust and token verification.
The article emphasizes the importance of not coupling the backend to Firebase infrastructure and highlights the benefits of issuing a separate JWT from the backend, which can carry custom claims, have controlled expiry, and be easily revoked.
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