Step 4: Let's write code to receive requests from clients. To do this, you are going to leverage other people's code by downloading a package. You can download packages by using a tool called npm, which unofficially stands for Node Package Manager. Type the following on the command line:

npm init

When prompted, press enter to accept each default choice. This process creates a package.json file, which will store info about each package you download. The package to help with receiving requests is called Express. Type the following on the command line:

npm install express

To use the package in your code, replace console.log with:

let express = require(`express`)
let app = express()