Parse JSON in shell script

{"name":"12345/testroot/Doc.docx","Id":"128202","numOfRevisions":2,

....

To get name ==>

`echo $json | sed 's/.*"name":"\(.*\)","Id.*/\1/g'`

To get Id ==>

`echo $json | sed 's/.*"Id":\(.*\),"numOf.*/\1/g'`