[Home](./index.md) > [@firebase/auth](./auth.md) > [IdTokenResult](./auth.idtokenresult.md) > [signInProvider](./auth.idtokenresult.signinprovider.md) ## IdTokenResult.signInProvider property The sign-in provider through which the ID token was obtained (anonymous, custom, phone, password, etc). Signature: ```typescript signInProvider: string | null; ``` ## Remarks Note, this does not map to provider IDs.