There are two ways to install Express: directly in the code itself or through the express-generator application generator tool. The express-generator tool installs the express CLI, which we can use to generate an application skeleton from. However, we won't be using that because it's mainly meant for client-facing applications, while we are just trying to build a server-side API at the moment. Instead, we'll add the express package directly into our code.
First, add the package into our project:
$ yarn add expressNow open up your src/index.js file, and replace our import of the http module with the express package. Also replace the current http.createServer and server.listen calls with express and app.listen. What was previously this:
... import http from 'http'; ... const server = http.createServer(requestHandler); server.listen(8080);
Would now be this:
... import express from 'express'; ... const app = express(); app.listen(process.env.SERVER_PORT);
To help us know...