This is Jabulr, a tool for viewing JSON data in tabular format.
Although naturally viewed as a tree, JSON data is often structured in such a way that a tabular view is both applicable and better suited to inspection.
To get started enter a URL pointing to your JSON in the 'source' field and, optionally, a 'path' to dig deeper into the data. Some examples are given below.
This is just some test text for your pleasure
Aw damn! I couldn't deal with that...