MEAN Web Development - Second Edition

Creating your first Express application

After creating your package.json file and installing your dependencies, you can create your first Express application by adding your already familiar server.js file with the following lines of code:

const express = require('express');
const app = express();

app.use('/', (req, res) => {
  res.status(200).send('Hello World');
});

app.listen(3000);
console.log('Server running at http://localhost:3000/');

module.exports = app;

You should have already recognized most of the code. The first two lines require the Express module and create a new Express application object. Then, we use the app.use() method to mount a middleware function with a specific path and the app.listen() method to tell the Express application ...