express Getting started with express Installation


Example

Express JS is the goto framework for developing Web Applications, APIs and almost any kind of Backend using Node.

To install express, all you have to do is run the npm command

npm install express --save

And you're done.


To create and run a new express server

create a file app.js and add this code

// require express
var express = require('express');
var app = express();

// when "/" is opened in url, this function will be called.
app.get('/', function (req, res) {
  res.json({ code: 200, message: 'success' });
})

app.listen( 3000, function () {
  console.log('Express server running at http://localhost:3000');
});
  • In your terminal, run node app.js and
  • Open the url http://localhost:3000 in web browser to see your newly created express server.

It's also a good idea to install body-parser and express-session along with express as most of the time you will want to read the data sent in POST request and manage user sessions.