You can convert php to json easily enough. The challeng is getting the right data from BP to function like an API. I have a 50% API done but I had problems with some of the info because of the database structure.
The best way would be to pull from database directly convert to json and disregard BP functions. The future web will work this way sooner or later. Web pages will be built from API data and not this archaic page rebuild method we currently use. Twitter.com is an example of this, the site is a web app pulling it’s data from the same API native apps use.
