What is Express.js

Express is a fast, assertive, essential and moderate web framework of Node.js. You can assume express as a layer built on the top of the Node.js that helps manage a server and routes. It provides a robust set of features to develop web and mobile applications.

Let's see some of the core features of Express framework:

It can be used to design single-page, multi-page and hybrid web applications.
It allows to setup middlewares to respond to HTTP Requests.
It defines a routing table which is used to perform different actions based on HTTP method and URL.
It allows to dynamically render HTML Pages based on passing arguments to templates.

Why use Express

Ultra fast I/O
Asynchronous and single threaded
MVC like structure
Robust API makes routing easy

How does Express look like

Let's see a basic Express.js app.

File: basic_express.js

var express = require('express');
var app = express();
app.get('/', function (req, res) {
  res.send('Welcome to JavaTpoint!');
});
var server = app.listen(8000, function () {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Example app listening at http://%s:%s', host, port);
});

Output:

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What is Express.js

Why use Express

How does Express look like