(non-null admin.credential.Credential or undefined)

A Credential object used to authenticate the Admin SDK.

See Initialize the SDK for detailed documentation and code samples.


(Object or undefined)

The object to use as the auth variable in your Realtime Database Rules when the Admin SDK reads from or writes to the Realtime Database. This allows you to downscope the Admin SDK from its default full read and write privileges.

You can pass null to act as an unauthenticated client.

See Authenticate with limited privileges for detailed documentation and code samples.


(string or undefined)

The URL of the Realtime Database from which to read and write data.