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# filterDataProviderBundleIdentifier

The bundle identifier of the filter data provider system extension.

```
var filterDataProviderBundleIdentifier: String? { get set }
```

## Discussion

If this property is `nil`, then the framework uses the bundle identifier of the [`NEFilterDataProvider`](/documentation/NetworkExtension/NEFilterDataProvider) extension in the calling app’s bundle. In this case, make sure the calling app’s bundle contains only one [`NEFilterDataProvider`](/documentation/NetworkExtension/NEFilterDataProvider), so there’s no ambiguity about which one to use.

This property only applies to system extensions, since macOS doesn’t support implementing a filter data provider as an app extension.

---

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