github.com/firebase/firebase-admin-go

Authentication

• When deployed in the Google App Engine environment, the SDK can now leverage the utilities provided by the App Engine SDK to sign JWT tokens. As a result, it is now possible to initialize the Admin SDK in App Engine without a service account JSON file, and still be able to call CustomToken() and CustomTokenWithClaims() .

Authentication

• Now uses the client options provided during SDK initialization to create the http.Client that is used to fetch public key certificates. This enables developers to use the ID token verification feature in environments like Google App Engine by providing a platform-specific http.Client using option.WithHTTPClient() .

• Initial release of the Admin Go SDK. See Add the Firebase Admin SDK to your Server to get started.

• You can configure the SDK to use service account credentials, user credentials (refresh tokens), or Google Cloud application default credentials to access your Firebase project.

Authentication

• The initial release includes the CustomToken() , CustomTokenWithClaims() , and VerifyIDToken() functions for minting custom authentication tokens and verifying Firebase ID tokens.

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Last updated 2026-10-01 UTC.

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