[Home](./index.md) > [@firebase/auth](./auth.md) > [getIdToken](./auth.getidtoken.md) ## getIdToken() function Returns a JSON Web Token (JWT) used to identify the user to a Firebase service. Signature: ```typescript export declare function getIdToken(user: User, forceRefresh?: boolean): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | user | [User](./auth.user.md) | The user. | | forceRefresh | boolean | Force refresh regardless of token expiration. | Returns: Promise<string> ## Remarks Returns the current token if it has not expired or if it will not expire in the next five minutes. Otherwise, this will refresh the token and return a new one.