Microsoft and some amazing contributors have given us the ability to format our list columns in Modern Lists & Libraries to provide a great user experience to our users when viewing lists.
To do this, you construct a JSON object that describes the elements that are displayed when a field is included in a list view, and the styles to be applied to those elements.
Luckily for us, most of the work is already done and all we have to do is copy and paste the JSON for the format we want from the Git repository. It’s as simple as going to your List column –> Column settings –> “Format this column” option and pasting in the JSON that has already been constructed by the contributors.

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples
I put this blog together as mostly a quick reference to myself so I can quickly choose a list column user experience to give to my clients based on a sample image that the column format does. Credit to the open source contributors for developing this JSON.
Concatenate Currency Symbol to Numeric Columns

Formatting an item when a date column is before or after today’s date

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/date-range-format
Creating Red-Amber-Green (RAG) bars based on date ranges

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/date-range-rag
Centered Content

Turn FileRef field into clickable thumbnail hyperlink

Turn field values into hyperlinks

Project Indicator Formats

Display social media profile pics using social media handles

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/generic-socialpic
Create a button to launch a Flow for the selected item

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/generic-start-flow
Displays a customizable Google map image for a given location

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/generic-staticmap
SVG icons

Display Twitter profile pics using Twitter handles

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/generic-twitterpic
Conditional formatting based on a number range

Format a number column as a number/percentage data bar


Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/number-data-bar
Formatting percentage number (%) to pie chart

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/number-piechart
Smiley faces for good quiz results

Show trending up/trending down icons

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/number-trending-icon
Highlight the current user

Person Mail To Link

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/person-mailto
Display a person’s profile picture in a circle

Display a picture column as a circle

Conditional formatting based on the value in a text or choice field

Formatting an ISBN (text column) to book cover image. Images are retrieved by calling Open Library Covers API

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/text-isbn-image
Traffic Light (Red-Yellow-Green) Status Indicator

Strikethrough on Completion

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/text-strikethrough
Formatting column with long text to multiple-line with word wrap.

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/text-wrap-format
Yes/No Checkbox

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/yesno-checkbox
Formatting Yes/No field to check mark based on the value in the field

Yes/No Column Check Mark

Reference: https://github.com/SharePoint/sp-dev-list-formatting/tree/master/column-samples/yesno-checkmark
So helpful! Thanks for putting this together.
Perfect