snowplow/snowplow-javascript-tracker

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

## ClientSession interface

Schema for client client session context entity

<b>Signature:</b>

```typescript
interface ClientSession extends Record<string, unknown> 
```
<b>Extends:</b> Record&lt;string, unknown&gt;

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [eventIndex](./browser-tracker.clientsession.eventindex.md) | number | Index of the current event in the session |
|  [firstEventId](./browser-tracker.clientsession.firsteventid.md) | string \| null | Identifier of the first event for this session |
|  [firstEventTimestamp](./browser-tracker.clientsession.firsteventtimestamp.md) | string \| null | Date-time timestamp of when the first event in the session was tracked |
|  [previousSessionId](./browser-tracker.clientsession.previoussessionid.md) | string \| null | The previous session identifier for this user |
|  [sessionId](./browser-tracker.clientsession.sessionid.md) | string | An identifier for the session (same as domain\_sessionid) |
|  [sessionIndex](./browser-tracker.clientsession.sessionindex.md) | number | The index of the current session for this user (same as domain\_sessionidx) |
|  [storageMechanism](./browser-tracker.clientsession.storagemechanism.md) | string | The mechanism that the session information has been stored on the device |
|  [userId](./browser-tracker.clientsession.userid.md) | string | An identifier for the user of the session (same as domain\_userid) |