# 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.tickPixelInterval

If tickInterval is `null` this option sets the approximate pixel interval of the tick marks. Not applicable to categorized axis.

The tick interval is also influenced by the minTickInterval option, that, by default prevents ticks from being denser than the data points.