Welcome to the second part of our series on generators and Koa. If you missed it you can read read part 1 here. Before starting with the development process, make sure that you have installed Node.js 0.11.9 or higher. In this part, we will be creating a dictionary API using Koa.js, and you'll learn about routing, compressing, logging, rate-limiting, and error handling in Koa.js. We will also use M