Koa – Expressive Middleware for Node.js

Koa is a new web framework designed by the team behind Express, which aims to be a smaller, more expressive, and more robust foundation for web applications and APIs. Through leveraging generators Koa allows you to ditch callbacks and greatly increase error-handling.

Koa does not bundle any middleware within core, and provides an elegant suite of methods that make writing servers fast and enjoyable. Koa’s middleware flow in a stack-like manner allowing you to perform actions downstream, then filter and manipulate the response upstream. Koa’s use of generators also greatly increases the readability and robustness of your application.

Requirements: Node.js Framework
Demo: http://koajs.com/
License: MIT License