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Firebase Auth Not Initializing - Authentication Fails
Firebase authentication never initializes. Login and signup endpoints return errors. The Firebase console shows requests aren't being received.
Common signs: 'Firebase app not initialized', 'auth/invalid-api-key', or auth always returns null.
Error Messages You Might See
Error: Firebase API Key not valid. Please pass a valid API key.
Error: auth/invalid-api-key
Error: Firebase app named "[DEFAULT]" already exists
Common Causes
- Firebase config not loaded or contains wrong project ID
- Firebase credentials missing or invalid API key
- Web API not enabled in Firebase console
- Firebase initialized after first auth call
- CORS policy blocking Firebase domain
How to Fix It
Verify Firebase config in environment: const config = { apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY, ... }
Initialize Firebase before any auth calls: firebase.initializeApp(config) at app startup
Check Firebase console: Authentications > Providers enabled, Security > API restrictions allow your domain
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You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Should Firebase config be public?
Yes, firebase config is meant to be public. Never commit actual API keys - use NEXT_PUBLIC_ env vars
How do I enable sign-in methods in Firebase?
Firebase Console > Authentication > Sign-in method > Enable Email/Password, Google, GitHub etc.
Why does Firebase auth work locally but not deployed?
Check that NEXT_PUBLIC_FIREBASE_* env vars are set in deployment config and match your Firebase project