Hapi is a server framework for Node.js originally created by Walmart Labs. It is designed as a scalable web framework that can help developers evolve their system over time. Hapi offers REST API support and infrastructure for building web apps or serving static content.
Still in a somewhat embryonic phase of its life (relatively speaking), Node.js already has the support of dozens of third party frameworks. In this slide show, InfoWorld.com identifies 13 of the more prominent ones that simplify the development of "complex websites, a data-driven Web apps, a real-time applications, or APIs."