snowplow/snowplow-javascript-tracker

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[Home](./index.md) &gt; [@snowplow/browser-tracker](./browser-tracker.md) &gt; [setUserId](./browser-tracker.setuserid.md)

## setUserId() function

Set the business-defined user ID for this user.

<b>Signature:</b>

```typescript
declare function setUserId(userId?: string | null, trackers?: Array<string>): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  userId | string \| null | The business-defined user ID |
|  trackers | Array&lt;string&gt; | The tracker identifiers which will be configured |

<b>Returns:</b>

void