filtering json with jq

jq is a fantastic command line tools to parse and filter json in command line. It works for linux, osx and maybe windows.
example, to format json
$ json='[{"genre":"deep house"}, {"genre": "progressive house"}, {"genre": "dubstep"}]'
$ echo $json
[{"genre":"deep house"}, {"genre": "progressive house"}, {"genre": "dubstep"}]
$ echo $json | jq .
"genre": "deep house"
"genre": "progressive house"
"genre": "dubstep"
To output a particular field
$ echo $json | jq '.[].genre'
"deep house"
"progressive house"
To filter based on a key
$ echo "$json" | jq -c '.[] | select(.genre | contains("house"))'
{"genre":"deep house"}
{"genre":"progressive house"}
more example could be found on here