[Home](./index.md) > [@firebase/auth](./auth.md) > [ParsedToken](./auth.parsedtoken.md) > [firebase](./auth.parsedtoken.firebase.md) ## ParsedToken.firebase property Firebase specific claims, containing the provider(s) used to authenticate the user. Signature: ```typescript 'firebase'?: { 'sign_in_provider'?: string; 'sign_in_second_factor'?: string; }; ```