JSONViewer port for Chrome is an updated version of Gildas' JSOnView extension.

The JSONViewer port for Chrome is a completely free and open source extension for Google Chrome that allows users to view JSON documents and make changes to them.

If you're not familiar with it, then you can simply say that it is an open source tool for reading JSON documents on the Web. What it does?

The JSONViewer port for Chrome extension parses the content of the given URL and displays it in a simple, easy-to-read format, similar to HTML. It is capable of translating the JSON format into many different languages.