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I use this almost daily, lets you easily format/compact and edit JSON through a GUI:

Easy to use, and makes working with complex JSON a snap.

The source is also available:

I think a tree view make for more sense for navigating JSON. The table view of the parser is very confusing for any JSON with lots of nesting.

If you add an assignment at the beginning, you can do this in your browser console :)

nice! didn't know about it.

in my case I needed a library to use it in a web app.

bookmarked anyway for personal use :)

The library that website is built on is Open Source. We use it for an internal project at work.