# JS API Reference

# Welcome to the Highcharts JS Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# plotOptions.scatter.cluster

Options for marker clusters, the concept of sampling the data values into larger blocks in order to ease readability and increase performance of the JavaScript charts.

Note: marker clusters module is not working with `boost` and `draggable-points` modules.

The marker clusters feature requires the marker-clusters.js file to be loaded, found in the modules directory of the download package, or online at code.highcharts.com/modules/marker-clusters.js.