> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gleap.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom data

## Add custom data

In many situations you may want to attach custom data to feedback items in order to better understand the context. You can add custom data incrementally or all at once. Any simple JSON object can be attached.

```dart theme={null}
Gleap.attachCustomData(customData: <String, dynamic>{'user': 'Franzi'});
```

If you want to attach custom data incrementally, you can do so with the `setCustomData` method.

```dart theme={null}
Gleap.setCustomData(key: 'value', value: 'Franzi');
```

## Remove custom data

Remove custom data key value pairs by calling the following method.

```dart theme={null}
Gleap.removeCustomDataForKey(key: 'value');
```

## Clear all custom data

It's possible to clear all attached custom data by calling the following method.

```dart theme={null}
Gleap.clearCustomData();
```