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Backbone.js is a JavaScript rich-client web app framework based on the model–view–controller design paradigm, intended to connect to an API over a RESTful JSON interface. Backbone has only hard dependency, which is on one JavaScript library, Underscore.js,. jQuery can also be optionally used for the library. It is designed for developing single-page web applications, and for keeping various parts of web applications synchronized. Backbone was created by Jeremy Ashkenas, who is also known for CoffeeScript and Underscore.js.