How to pretty-print JSON script?

root@ubuntu:~# echo '{"foo": "lorem", "bar": "ipsum"}'| json_pp 
{
   "bar" : "ipsum",
   "foo" : "lorem"
}
root@ubuntu:~# echo '{"foo": "lorem", "bar": "ipsum"}'| python -mjson.tool
{
    "bar": "ipsum", 
    "foo": "lorem"
}

 来自：http://stackoverflow.com/questions/352098/how-to-pretty-print-json-script