Building the application

In this section, we will get right into the code and start to build our application. We will need to follow these steps:

1. Starting the server
2. Connecting to a database

3. Creating data models
4. Setting up a router
5. Setting up a logger
6. Creating contact endpoints and controller actions
7. Validating requests

Starting the server

First, let's start a simple server in our index.js entry file. In the following code block, we simply require Koa as a dependency, then start a Koa server by using the app.listen() method:

// ./index.js

const Koa = require('koa');
const app = new Koa();

const port = process.env.PORT || 3000;
app.listen(port, () =>
  console.log(`Server running on http://localhost:${port...