# 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.columnpyramid.dataLabels.formatter

Callback JavaScript function to format the data label. Note that if a `format` is defined, the format takes precedence and the formatter is ignored.