Step 1: Setup new npm package
npm init
Step 2 : Install the following package: dotenv
npm install dotenv
Step 3: Create a new .env file in the root directory
Step 4: Add Following Code into the .env file
PORT_NUMBER=3000
Step 5 : To create index.js file add following code
const path = require('path');
const express = require("express");
const app = express();
const dotenv = require("dotenv").config({path:path.resolve('.env')});
const env = dotenv.parsed;
const portNumber = env.PORT_NUMBER;
app.get("/", (req, res) => {
res.send("Hello Friends!");
});
app.listen(portNumber, () => {
console.log(`Example app listening on port ${portNumber}!`);
});
Step 6: Run the application
node index.js