In Ubuntu, open preferences, browse packages, to get location of packages folder, and open a terminal and change into that folder
$ git clone https://github.com/dzhibas/SublimePrettyJson.git
Ubuntu: /username/.config/sublime-text-2/Packages
The use [Ctrl]+[Alt]+[j] to run the prettify command
or in iOS us [Ctrl]+[Cmd]+[j]
Refer: https://github.com/dzhibas/SublimePrettyJson