[Home](./index.md) > [@firebase/auth](./auth.md) > [AuthCredential](./auth.authcredential.md) > [signInMethod](./auth.authcredential.signinmethod.md) ## AuthCredential.signInMethod property The authentication sign in method for the credential. Signature: ```typescript readonly signInMethod: string; ``` ## Remarks For example, [SignInMethod.EMAIL\_PASSWORD](./auth.signinmethod.email_password.md), or [SignInMethod.EMAIL\_LINK](./auth.signinmethod.email_link.md). This corresponds to the sign-in method identifier as returned in [fetchSignInMethodsForEmail()](./auth.fetchsigninmethodsforemail.md).