Installing dependencies for Koa apps

Koa is minimalistic. It is barebones by nature. Hence, it does not have any middleware within its core. Express comes with a router, which, by default, Koa does not have. This can be a challenge when writing an app in Koa as you need to choose a third-party package or pick one of the packages listed on their GitHub main page at https://github.com/koajs. You may test out a few and find out they don't work as you want. There are a few Koa packages that can be used for routing; koa-router is mostly used in this book, alongside other essential dependencies for developing our API with Koa. Let's discover what they are and what they do by installing them and creating a skeleton app, as follows:

1. Install the koa-router module and use it as follows:

$ npm i koa-router

Import koa-router in the entry file with a home route, /, as follows:

// src/index.js
const Router = require('koa-router')
const router = new Router()

router...