JSON Formatter is a Chrome add-on developed by Nik Rolls that aims to make JSON easy to read. This open-source extension is a fork of the original, which is no longer updated.

The add-on provides a range of features to enhance the reading experience of JSON. It supports both JSON and JSONP and offers syntax highlighting with 36 light and dark themes. The collapsible trees with indent guides make it easy to navigate through the JSON structure, while line numbers provide better orientation. The extension also allows users to click on URLs within the JSON and toggle between raw and parsed JSON.

One of the standout features of JSON Formatter is its versatility. It works on any valid JSON page, regardless of the URL. Additionally, it can also be used on local files by enabling the option in the chrome://extensions settings. Users can even inspect the JSON by typing "json" in the console.

It's worth noting that JSON Formatter may clash with other JSON highlighters or beautifiers like 'JSONView', 'Pretty JSON', or 'Sight'. In such cases, it is recommended to disable those extensions before trying JSON Formatter.

Privacy-conscious users will be pleased to know that JSON Formatter does not track or display any advertising. It is a clean and straightforward tool focused solely on providing an enhanced JSON reading experience.

For those interested in the source code, it is available on GitHub at github.com/nikrolls/json-formatter. Bugs, suggestions, and questions can be submitted on the GitHub issues page at github.com/nikrolls/json-formatter/issues. Nik Rolls can be reached on Twitter at twitter.com/nikrolls for any further inquiries.