# 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.

# series.area.fillColor

Fill color or gradient for the area. When `null`, the series' `color` is used with the series' `fillOpacity`.

In styled mode, the fill color can be set with the `.highcharts-area` class name.