voluptasmollitia/docs-exp/analytics.setuserid.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/analytics](./analytics.md) &gt; [setUserId](./analytics.setuserid.md)

## setUserId() function

Use gtag 'config' command to set 'user\_id'.

<b>Signature:</b>

```typescript
export declare function setUserId(analyticsInstance: Analytics, id: string, options?: AnalyticsCallOptions): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  analyticsInstance | [Analytics](./analytics.analytics.md) | Firebase Analytics instance. |
|  id | string | User ID to set. |
|  options | [AnalyticsCallOptions](./analytics.analyticscalloptions.md) |  |

<b>Returns:</b>

void