What is koa.js? Koa.js is a widely used server-side framework for Node.js. Koa was created by the same creators of express, another popular javascript framework. Koa.js is a lightweight framework for developing applications and APIs. Koa.js eliminates callbacks and significantly improves error handling by leveraging async functions. The core of Koa.js does not include any middleware, but it does include an elegant set of methods for writing servers quickly and easily. Each request is composed and executed in a stack-like manner by Koa.js, which contains an array of middleware generator functions. Goals of koa.js Aims to be a smaller, more expressive, and more robust foundation for web applications and APIs. Benefits of Using koa.js Extremely Lightweight Smaller footprint than any other node.js framework including Express. Thinner and better middleware. You have the option to extend the framework. Modern Framework Koa is built ES6+ and promotes mode...