How to Fix
Lovable Auth Issues

Why Lovable Authentication Breaks

Lovable generates authentication UI quickly — login forms, sign-up pages, password reset flows. But the backend auth logic is often incomplete or misconfigured. The UI looks great, but the actual authentication does not work.

Common issues include NextAuth configuration mismatches, OAuth callback URL problems, session persistence issues, and missing environment variables for auth providers.

Issue: OAuth Login Redirects Fail

Google or GitHub login fails with a redirect error. This is almost always a mismatch between the callback URL in your OAuth provider console and your app URL.

Fix: In your Google Cloud Console or GitHub Developer Settings, add the exact callback URL. For production, it must be https://yourdomain.com/api/auth/callback/google. For localhost: http://localhost:3000/api/auth/callback/google. Both must exist in the OAuth settings.

Issue: Sessions Not Persisting

Users log in but are logged out immediately or on the next page refresh.

Fix: Check your NEXTAUTH_SECRET environment variable. It must be set to a long random string (at least 32 characters) and must be the same in all environments. Also check NEXTAUTH_URL — in production it must match your domain exactly.

Issue: Protected Routes Are Public

Pages that should require login are accessible to anyone without authentication.

Fix: Lovable sometimes generates client-side-only auth checks. Implement Next.js middleware to protect routes at the edge. Every API route should also check the session before returning data.

Issue: Sign-up Flow Incomplete

The registration form submits but no account is created. Or the account is created but the user is not automatically logged in.

Fix: Check your registration API route. The user creation and session signing must happen together. Lovable often generates one without the other.

Getting Help

Authentication is security-critical — mistakes here can expose user data. If you are not confident in your auth fixes, get expert help.