gem install colorful_json
curl http://blah/blah.json | cjson
How about using httpie? https://github.com/jkbr/httpie
cjson is nice when you have local scripts outputting json, httpie is suited for testing webservices and AJAX pages.
Why we need another tool for that ?
Is http://stedolan.github.io/jq/ not good enough for get the job done ?