Authenticate with Firebase using Okta

Firebase Custom Authentication can integrate an existing identity provider such as Okta with Firebase services, allowing users authenticated through Okta to access Realtime Database, Cloud Firestore, Cloud Storage, and other Firebase features under consistent user identities and permissions. The approach uses a Node.js Express backend, deployable as a Cloud Function or elsewhere, to validate an Okta access token with Okta’s JWT verifier and exchange it for a Firebase custom token created through the Firebase Admin SDK using the Okta user ID. Setup requires configuring an Okta single-page application, trusted origins, a Firebase web project, and, for Cloud Functions deployments, appropriate Google Cloud service-account permissions. A simple web frontend uses Okta’s sign-in widget to obtain an access token, sends it to the protected token-exchange endpoint, and calls Firebase’s signInWithCustomToken method with the returned token. On first sign-in, Firebase creates a corresponding user record, after which Firebase authentication state listeners can update the interface and Firebase Security Rules can control access to protected resources; the same general pattern can be adapted for providers such as Auth0, Azure Active Directory, or custom identity systems.

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