voluptasmollitia/docs-exp/auth.additionaluserinfo.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [AdditionalUserInfo](./auth.additionaluserinfo.md)

## AdditionalUserInfo interface

A structure containing additional user information from a federated identity provider.

<b>Signature:</b>

```typescript
export interface AdditionalUserInfo 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [isNewUser](./auth.additionaluserinfo.isnewuser.md) | boolean | Whether the user is new (created via sign-up) or existing (authenticated using sign-in). |
|  [profile](./auth.additionaluserinfo.profile.md) | Record&lt;string, unknown&gt; \| null | Map containing IDP-specific user data. |
|  [providerId](./auth.additionaluserinfo.providerid.md) | string \| null | Identifier for the provider used to authenticate this user. |
|  [username?](./auth.additionaluserinfo.username.md) | string \| null | <i>(Optional)</i> The username if the provider is GitHub or Twitter. |