Koa Description
Express's new web framework Koa was created by the team behind Express. It aims to be a smaller and more expressive web framework that can be used to build web applications and APIs. Koa leverages async functions to eliminate callbacks and improve error handling. Koa doesn't bundle any middleware in its core. It provides an elegant suite that makes writing servers fast and fun. A Koa application is an object that contains a collection of middleware functions. These functions are composed and executed in a stack-like fashion upon request. Koa is similar in design to Ruby's Rack and Connect. However, Koa provides high-level "sugar", at the low-level middleware layer. This increases interoperability and robustness and makes middleware writing much more enjoyable.
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