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

Revisiting the router middleware

This chapter would be incomplete without revisiting the router middleware.

The router middleware is very special middleware. While other Express middlewares are inherited from Connect, router is implemented by Express itself. This middleware is solely responsible for empowering Express with Sinatra-like routes.


Connect-inherited middlewares are referred to in Express from the express object (express.favicon(), express.bodyParser(), and so on). The router middleware is referred to from the instance of the Express app (app.router).

To refresh your memory, we learned in Chapter 2, Your First Express App, that if the router middleware is not explicitly added in the middleware stack, it is added at the point where a route is defined for the first time. To ensure predictability and stability, we should explicitly add router to the middleware stack:


The router middleware is a middleware system of its own. The route definitions form the middlewares...