Book Image

Node.js Design Patterns

By : Mario Casciaro
Book Image

Node.js Design Patterns

By: Mario Casciaro

Overview of this book

Node.js is a massively popular software platform that lets you use JavaScript to easily create scalable server-side applications. It allows you to create efficient code, enabling a more sustainable way of writing software made of only one language across the full stack, along with extreme levels of reusability, pragmatism, simplicity, and collaboration. Node.js is revolutionizing the web and the way people and companies create their software. In this book, we will take you on a journey across various ideas and components, and the challenges you would commonly encounter while designing and developing software using the Node.js platform. You will also discover the "Node.js way" of dealing with design and coding decisions. The book kicks off by exploring the fundamental principles and components that define the platform. It then shows you how to master asynchronous programming and how to design elegant and reusable components using well-known patterns and techniques. The book rounds off by teaching you the various approaches to scale, distribute, and integrate your Node.js application.
Table of Contents (16 chapters)
Node.js Design Patterns
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

Patterns for wiring modules


Now that we have discussed some basic theory around dependencies and coupling, we are ready to dive into some more practical concepts. In this section, in fact, we are going to present the main module wiring patterns. Our focus will be mainly pointed towards the wiring of stateful instances, which are, without any doubts, the most important type of dependencies in an application.

Hardcoded dependency

We start our analysis by looking at the most conventional relationship between two modules, which is the hardcoded dependency. In Node.js, this is obtained when a client module explicitly loads another module using require(). As we will see in this section, this way of establishing module dependencies is simple and effective, but we have to pay additional attention to hardcoding dependencies with stateful instances, as this would limit the reusability of our modules.

Building an authentication server using hardcoded dependencies

Let's start our analysis by looking at...