voluptasmollitia/docs-exp/auth.signinanonymously.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [signInAnonymously](./auth.signinanonymously.md)

## signInAnonymously() function

Asynchronously signs in as an anonymous user.

<b>Signature:</b>

```typescript
export declare function signInAnonymously(auth: Auth): Promise<UserCredential>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  auth | [Auth](./auth.auth.md) | The Auth instance. |

<b>Returns:</b>

Promise&lt;[UserCredential](./auth.usercredential.md)<!-- -->&gt;

## Remarks

If there is already an anonymous user signed in, that user will be returned; otherwise, a new anonymous user identity will be created and returned.