# GetLayerCategoriesGroup

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A single category from the response from the [LayersController.getCategoryData](https://developers.felt.com/js-sdk-api-reference/layerscontroller#getcategorydata) method.

## Properties

### key

> **key**: `string` | `number` | `boolean`

The category for which the value was calculated.

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### value

> **value**: `null` | `number`

The value calculated for the category, whether a count, sum, average, etc.

`null` is returned if there are no features in the category as opposed to zero,\
so as not to confuse with a real zero value from some aggregation.