How to use the Query field? what filtering functionality is available?

[Motti-Shneor]

I never heard of JSON query format - Maybe you refer to some broadly used format I don't know, but still - I cannot guess anything that work for me - It always gives me either the whole JSON, or an error. no matter what I try there. Also, how to dig into Array? how to filter by wild-cards or regular expressions? is there anything except the "=" relation?

a simplistic half page documentation with, few demonstrative samples (on the provided "langs" JSON sample) plus few sentences tutorial - would greatly enhance the usability of this nifty little Application.