This plugin is based on "WP Favorite Posts",and extends json api to provide access for mobile apps.
Three methods are provided:
wpfp/add
postid: required
cookie: optional
wpfp/remove
postid：required
cookie：optional
wpfp/lists
cookie ：optional
The cookie param is the same as "JSON API USER" plugin used.
These methods support users not logged,if the client side can receive and send cookies.
code can be found at:
https://github.com/avrilmaomao/wp-favorite-posts-extended