JSON and Cygwin - how to parse, get fields, etc

JSON and Cygwin - how to parse, get fields, etc

I'm getting a JSON based output when sending GET requests to an API
online, using Cygwin. I know how to manage JSON files over PHP and JS, but
in this I wish to keep using Cygwin.
Is there any way to "handle" those files, getting fields' value, etc? I
know I can "create" something manually with sed, grep, awk and such - but
I'm looking, first of all, for something which is "ready-to-use".
Example: { "campaign": { "name": "my campaign", "id": 1434, "creatives": [
{ "id": 4162, "state": "active" } ], } }
Thanks a lot, Etay