# 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.

# chart.parallelAxes.tooltipValueFormat

Parallel coordinates only. Format that will be used for point.y and available in tooltip.pointFormat as `{point.formattedValue}`. If not set, `{point.formattedValue}` will use other options, in this order:

1. yAxis.labels.format will be used if set

2. If yAxis is a category, then category name will be displayed

3. If yAxis is a datetime, then value will use the same format as yAxis labels

4. If yAxis is linear/logarithmic type, then simple value will be used