api-docs/docs/browser-tracker/markdown/browser-tracker.clientsession.previoussessionid.md from snowplow/snowplow-javascript-tracker

api-docs/docs/browser-tracker/markdown/browser-tracker.clientsession.previoussessionid.md

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[Home](./index.md) &gt; [@snowplow/browser-tracker](./browser-tracker.md) &gt; [ClientSession](./browser-tracker.clientsession.md) &gt; [previousSessionId](./browser-tracker.clientsession.previoussessionid.md)

## ClientSession.previousSessionId property

The previous session identifier for this user

<b>Signature:</b>

```typescript
previousSessionId: string | null;
```