#59 most commonenv/configCursorWindsurfBolt.newReplitv0

Firebase: auth/invalid-api-key or api-key-not-valid

FirebaseError: Firebase: Error (auth/invalid-api-key). / auth/api-key-not-valid.-please-pass-a-valid-api-key.

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What it means

Your app's Firebase settings are missing or wrong, usually because the config values didn't load from environment variables on the live site.

How to fix it: paste this prompt into your AI builder

Fix prompt for Bolt, Cursor, Replit, v0, Windsurf
Firebase says auth/invalid-api-key. Check the Firebase config object: every value (apiKey, authDomain, projectId, appId) must come from correctly prefixed env vars (VITE_ / NEXT_PUBLIC_) that are set on my host, with no quotes or spaces. Enable the needed sign-in provider. Don't change unrelated code.

If the AI can't fix it: manual steps

  1. Firebase console, Project settings, Your apps: copy the config values again.

Where this happens

Seen in these AI app builders and editors:

CursorWindsurfBolt.newReplitv0

Sources

Related env/config errors

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