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# formatIdentifier

A string uniquely identifying the format of the adjustment data.

```
var formatIdentifier: String { get }
```

## Discussion

Set this identifier when you create an adjustment object with the [`init(formatIdentifier:formatVersion:data:)`](/documentation/Photos/PHAdjustmentData/init(formatIdentifier:formatVersion:data:)) method. For best results, identify your organization or product using a reverse-DNS-style name, such as `com.example.myApp`.

Read this property, and the [`formatVersion`](/documentation/Photos/PHAdjustmentData/formatVersion) property, to determine whether the adjustment data saved with an asset was created by your app or is otherwise compatible with your app.

---

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