This Firebase Authentication error occurs when creating or updating users with invalid provider data. Provider data must be a valid array of UserInfo objects with required fields like providerId and uid. Fix by validating your provider data structure before Firebase calls.
The "auth/invalid-provider-data" error in Firebase Authentication happens when your code attempts to create or update a user account with provider data that doesn't match Firebase's expected format. Provider data represents authentication information from external providers (Google, Facebook, etc.) that you want to associate with a Firebase user. Each provider data object must contain specific required fields and follow Firebase's data format rules. This error commonly appears when provider data array contains invalid objects, missing required fields, incorrect data types, or duplicate provider entries.
Ensure each provider data object has required fields: providerId (string), uid (string), and optional fields like displayName, email, phoneNumber, photoURL. Example: { providerId: "google.com", uid: "123", email: "[email protected]" }
Different providers have specific needs: password provider requires email, phone provider requires phoneNumber. Check each provider type has its required fields.
Check for: incorrect uid format (should be provider's actual user ID), missing provider-specific fields, invalid providerId values, incorrect array structure.
Create a function to validate provider data before Firebase calls. Check array structure, required fields, supported providers, duplicates, and provider-specific requirements.
Update your Firebase Admin SDK code to properly handle provider data in createUser(), updateUser(), and importUsers() methods. Add error handling for invalid-provider-data errors.
Enable detailed logging, validate with test endpoints, use Firebase Console for monitoring, check Cloud Logging, and create validation test suites.
Firebase provider data links external identity providers to Firebase user accounts. Each entry contains provider-specific information used for authentication and profile population. Common migration scenarios include moving from legacy systems, adding new providers to existing users, and cleaning up malformed provider data. Security considerations include server-side validation, UID uniqueness, and email verification. Performance can be optimized with batch operations and caching.
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