# LayerChangeCallbackParams

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The parameters for the [\`onLayerChange\`](https://developers.felt.com/js-sdk-api-reference/layerscontroller#onlayerchange) listener.

## Properties

### layer

> **layer**: `null` | [`Layer`](https://developers.felt.com/js-sdk-api-reference/layers/layer)

The new data for the layer or null if the layer was removed.