Eiffel Collection+json is a library to work with Collection+JSON - Hypermedia Type, http://www.amundsen.com/media-types/collection/ Project page: https://github.com/eiffelwebframework/collection_json The current CJ implementation does not implement the [extensions][1] proposals, The google group is here [discussion group][2] [1]: https://github.com/mamund/collection-json/tree/master/extensions "extensions" [2]: https://groups.google.com/forum/?fromgroups#!forum/collectionjson "discussion group"