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What is Koa?

Koa is a JavaScript framework for web applications that was designed to integrate with legacy servers. Koa is an alternative to Node.js, an open source framework that uses Google's V8 engine to build scalable network applications. One of the main differences between Koa and Node.js is that Koa does not use callbacks or event loops, which are used by Node.js. Rather, it uses generators which are converted into promises after compilation time

Articles related to Koa are most often tutorials or walkthroughs on the use of the framework, but may also include articles describing how Koa works within a larger app ecosystem.