[Home](./index.md) > [@firebase/auth](./auth.md) > [AuthCredential](./auth.authcredential.md) > [providerId](./auth.authcredential.providerid.md) ## AuthCredential.providerId property The authentication provider ID for the credential. Signature: ```typescript readonly providerId: string; ``` ## Remarks For example, 'facebook.com', or 'google.com'.