api-docs/docs/browser-tracker/markdown/browser-tracker.pageviewevent.contextcallback.md
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[Home](./index.md) > [@snowplow/browser-tracker](./browser-tracker.md) > [PageViewEvent](./browser-tracker.pageviewevent.md) > [contextCallback](./browser-tracker.pageviewevent.contextcallback.md)
## PageViewEvent.contextCallback property
A callback which will fire on the page view and each subsequent activity tracking event for this page view
<b>Signature:</b>
```typescript
contextCallback?: (() => Array<SelfDescribingJson>) | null;
```