I worked on a phonegap application using html5 for a month. I handle offline JSON files using File API. It seems that the JSON files I st
You might consider to utilize Mott: https://github.com/imlucas/mott, e.g. http://phonegap.com/blog/2013/04/23/story-behind-exfm/
It seems to be able dynamically version, update and persist update of any local asset.