Book Image

Express Web Application Development

By : Hage Yaaapa
Book Image

Express Web Application Development

By: Hage Yaaapa

Overview of this book

Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications. It provides a thin layer of features fundamental to any web application, without obscuring features that developers know and love in node.js. "Express Web Application Development" is a comprehensive guide for those looking to learn how to use the Express web framework for web application development. Starting with the initial setup of the Express web framework, "Express Web Application Development" helps you to understand the fundamentals of the framework. By the end of "Express Web Application Development", you will have acquired enough knowledge and skills to create production-ready Express apps. All of this is made possible by the incremental introduction of more advanced topics, starting from the very essentials. On the way to mastering Express for application development, we teach you the more advanced topics such as routes, views, middleware, forms, sessions, cookies and various other aspects of configuring an Express application. Jade; the recommended HTML template engine, and Stylus; the CSS pre-processor for Express, are covered in detail. Last, but definitely not least, Express Web Application Development also covers practices and setups that are required to make Express apps production-ready.
Table of Contents (15 chapters)
Express Web Application Development
About the Author
About the Reviewers

Defining routes for the app

From the examples in Chapter 1, What is Express? and Chapter 2, Your First Express App, we know how routes and route handler callback functions look like. Here is an example to refresh your memory:

app.get('/', function(req, res) {

Routes in Express are created using methods named after HTTP verbs. For instance, in the previous example, we created a route to handle GET requests to the root of the website. You have a corresponding method on the app object for all the HTTP verbs listed earlier.

Let's create a sample application to see if all the HTTP verbs are actually available as methods in the app object:

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

// Include the router middleware

// GET request to the root URL
app.get('/', function(req, res) {
  res.send('/ GET OK');

// POST request to the root URL'/', function(req, res) {
  res.send('/ POST OK');

// PUT...