About column formatting
Improve the display of columns in SharePoint lists with formatting. The column-formatting text describes the elements that are displayed and their display style. The data in the column doesn't change.
Anyone who can create and manage views in a list can access column formatting from the column settings.
Column formatting example
Here is a standard list view, without formatting:
With formatting, a colored bar shows size, a mail link is added, and status is indicated with colors and icons:
Column formatting is applied using a text format called JSON. However, you don't have to know everything about JSON to format columns.
To get started:
Copy and paste text from the column formatting JSON reference to columns in your SharePoint list.