api-docs/docs/browser-tracker/markdown/browser-tracker.clientsession.userid.md
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[Home](./index.md) > [@snowplow/browser-tracker](./browser-tracker.md) > [ClientSession](./browser-tracker.clientsession.md) > [userId](./browser-tracker.clientsession.userid.md)
## ClientSession.userId property
An identifier for the user of the session (same as domain\_userid)
<b>Signature:</b>
```typescript
userId: string;
```