Book Image

Learning Node.js Development

By : Andrew Mead
Book Image

Learning Node.js Development

By: Andrew Mead

Overview of this book

Learning Node.js Development is a practical, project-based book that provides you with all you need to get started as a Node.js developer. Node is a ubiquitous technology on the modern web, and an essential part of any web developers' toolkit. If you are looking to create real-world Node applications, or you want to switch careers or launch a side project to generate some extra income, then you're in the right place. This book has been written around a single goal—turning you into a professional Node developer capable of developing, testing, and deploying real-world production applications. Learning Node.js Development is built from the ground up around the latest version of Node.js (version 9.x.x). You'll be learning all the cutting-edge features available only in the latest software versions. This book cuts through the mass of information available around Node and delivers the essential skills that you need to become a Node developer. It takes you through creating complete apps and understanding how to build, deploy, and test your own Node apps. It maps out everything in a comprehensive, easy-to-follow package designed to get you up and running quickly.
Table of Contents (13 chapters)

Express Middleware

In this section, you'll learn how to use Express middleware. Express middleware is a fantastic tool. It allows you to add on to the existing functionality that Express has. So if Express doesn't do something you'd like it to do, you can add some middleware and teach it how to do that thing. Now we've already used a little bit of middleware. In server.js file, we used some middleware and we teach Express how to read from a static directory, which is shown here:

app.use(express.static(__dirname + '/public'));

We called app.use, which is how you register middleware, and then we provided the middleware function we want to use.

Now middleware can do anything. You could just execute some code such as logging something to the screen. You could make a change to the request or the response object. We'll do just that in the next chapter...