Ability to test server actions in the editor

Regarding debugging queries, this might be useful:

(if you're on Windows - but I'm sure there's a Mac equivalent)

Also, for checking the output, the feature to run the query and view the JSON is very useful, and if you're using GET parameters, you can of course add them at that point.

Having said that, a proper debugger would be a nice feature - but probably not a trivial task to develop, and there are more important things to come first (IMO).