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.
A Koa application is an object containing an array of middleware generator functions which are composed and executed in a stack-like manner upon request. Koa is similar to many other middleware systems that you may have encountered such as Ruby’s Rack, Connect, and so on – however a key design decision was made to provide high level “sugar” at the otherwise low-level middleware layer. This improves interoperability, robustness, and makes writing middleware much more enjoyable.
This includes methods for common tasks like content-negotation, cache freshness, proxy support, and redirection among others. Despite supplying a reasonably large number of helpful methods Koa maintains a small footprint, as no middleware are bundled.
[button color=”black” size=”medium” link=”http://koajs.com/” target=”blank” ]Koa[/button]
