[Home](./index.md) > [@firebase/auth](./auth.md) > [multiFactor](./auth.multifactor.md) ## multiFactor() function The [MultiFactorUser](./auth.multifactoruser.md) corresponding to the user. Signature: ```typescript export declare function multiFactor(user: User): MultiFactorUser; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | user | [User](./auth.user.md) | The user. | Returns: [MultiFactorUser](./auth.multifactoruser.md) ## Remarks This is used to access all multi-factor properties and operations related to the user.