Express.js Introduction

Express.js tutorial provides basic and advanced concepts of Express.js. Our Express.js tutorial is designed for beginners and professionals both.

Express.js is a web framework for Node.js. It is a fast, robust and asynchronous in nature.

Our Express.js tutorial includes all topics of Express.js such as Express.js installation on windows and linux, request object, response object, get method, post method, cookie management, scaffolding, file upload, template etc.

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 rookienerd!');
});
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:

Express.js Index

Prerequisite

Before learning Express.js, you must have the basic knowledge of JavaScript and Node.js.

Audience

Our Express.js tutorial is designed to help beginners and professionals.

Problem

We assure that you will not find any problem in this Express.js tutorial. But if there is any mistake, please post the problem in contact form.