Express apps generally follow a pattern - our server.js file is already checking off a number of the boxes.

// Import dependancies
// - brings in all of the modules we'll be using
require('dotenv').config()
const express = require('express')

// Create an instance of an express app 
// - create the actual server object
const server = express()

// Connect the app to global middleware
// - functions that every endpoint passes through
server.use(express.json())

// Endpoints check connection and perform functions
// - the code that sends and receives messages and determines what to do
server.get('/hello', (req, res) => {
  res.json({ message: 'Hello from the Server' })
})

// Listen to or export server
// - what the rest of the world connects to 
module.exports = server

Note how we added a line in the middleware section.

express.json() parses JSON data out of incoming requests

◀ Separation of Concerns I

Separation of Concerns II ▶