> For the complete documentation index, see [llms.txt](https://docs.kepler.gl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kepler.gl/examples/custom-reducer.md).

# Customize kepler.gl Reducer

This example demos how to customize kepler.gl reducer

1. Customize reducer initialState by `keplerGlReducer.initialState`
2. Adding custom actions by `keplerGlReducer.plugins`

### Local dev

```
yarn
```

add mapbox access token to node env

```
export MapboxAccessToken=<your_mapbox_token>
```

then

```
yarn start
```