SP Formatter features: 

- Live Preview as you type (no need to click "Preview" button)
- Intellisense (suggestions) based on Column or View formatting schema, CSS styles, replaceable tokens (`@currentField`, list fields with `$` based on the context)
- JSON validation with error messages in the editor
- Help tooltips for JSON properties
- Color highlights
- Line numbers, brace matching, collapsible regions
- Hotkeys: search, replace, format document, go to line and others available for monaco-editor
- Easily switch between default and enhanced editor
- VSCode integration
- Full screen mode

Supported platforms: 

 - SharePoint Online
 - SharePoint 2019 (through a separate extension, read more https://github.com/pnp/sp-formatter/blob/master/sp2019/README.md)

PRIVACY POLICY
SP Formatter does not collect nor store any personal data.

CHANGELOG: 
https://github.com/pnp/sp-formatter/blob/master/web-extension/CHANGELOG.md