Hapi is a framework designed to build rich web applications and RESTful API services. A configuration-centric framework, hapi lets developers write reusable application logic while minimizing the time spent building infrastructure. It comes with multiple configuration options, including the ability to quickly combine groups of servers into a single logical unit (known as a "pack") and to provide a unified plugin interface. In addition, hapi comes with baked-in support for authentication, caching, and input validations, among other features. Beats Music, Condé Nast, Mozilla, and Walmart are just a sample of the many companies leveraging hapi to build applications and web services.