Node.js Design Patterns Third Edition

Learn proven patterns, techniques, and tricks to take full advantage of the Node.js platform. Master well-known design principles to create applications that are readable, extensible, and that can grow big.

▶Book Description
In this book, we will show you how to implement a series of best practices and design patterns to help you create efficient and robust Node.js applications with ease.

We kick off by exploring the basics of Node.js, analyzing its asynchronous event driven architecture and its fundamental design patterns. We then show you how to build asynchronous control flow patterns with callbacks, promises and async/await. Next, we dive into Node.js streams, unveiling their power and showing you how to use them at their full capacity. Following streams is an analysis of different creational, structural, and behavioral design patterns that take full advantage of JavaScript and Node.js. Lastly, the book dives into more advanced concepts such as Universal JavaScript, scalability and messaging patterns to help you build enterprise-grade distributed applications.

Throughout the book, you'll see Node.js in action with the help of several real-life examples leveraging technologies such as LevelDB, Redis, RabbitMQ, ZeroMQ, and many others. They will be used to demonstrate a pattern or technique, but they will also give you a great introduction to the Node.js ecosystem and its set of solutions.

▶What You Will Learn
-Become comfortable with writing asynchronous code by leveraging callbacks, promises, and the async/await syntax
-Leverage Node.js streams to create data-driven asynchronous processing pipelines
-Implement well-known software design patterns to create production grade applications
-Share code between Node.js and the browser and take advantage of full-stack JavaScript
-Build and scale microservices and distributed systems powered by Node.js
-Use Node.js in conjunction with other powerful technologies such as Redis, RabbitMQ, ZeroMQ, and LevelDB

▶Key Features
-Learn how to create solid server-side applications by leveraging the full power of Node.js 14
-Understand how Node.js works and learn how to take full advantage of its core components as well as the solutions offered by its ecosystem
-Avoid common mistakes and use proven patterns to create production grade Node.js applications

▶Who This Book Is For
This book is for developers and software architects who have some prior basic knowledge of JavaScript and Node.js and now want to get the most out of these technologies in terms of productivity, design quality, and scalability. Software professionals with intermediate experience in Node.js and JavaScript will also find valuable the more advanced patterns and techniques presented in this book.

This book assumes that you have an intermediate understanding of web application development, databases, and software design principles.

▶What this book covers
- Chapter 1, The Node.js Platform, serves as an introduction to the world of Node.js application design by showing the patterns at the core of the platform itself. It covers the Node.js ecosystem and its philosophy, and provides a quick introduction to the Node.js internals and the reactor pattern.

- Chapter 2, The Module System, dives into the module systems available in Node.js, underlining the differences between CommonJS and the more modern ES modules from the ECMAScript 2015 specification.

- Chapter 3, Callbacks and Events, introduces the first steps towards learning asynchronous coding and its patterns, discussing and comparing callbacks and the event emitter (observer pattern).

- Chapter 4, Asynchronous Control Flow Patterns with Callbacks, introduces a set of patterns and techniques for efficiently handling asynchronous control flow in Node.js using callbacks. This chapter teaches you some traditional ways to mitigate the "callback hell" problem using plain JavaScript.

- Chapter 5, Asynchronous Control Flow Patterns with Promises and Async/Await, progresses with the exploration of more sophisticated and modern asynchronous control flow techniques.

- Chapter 6, Coding with Streams, dives deep into one of the most important tools in Node.js: streams. It shows you how to process data with transform streams and how to combine them into different patterns.

- Chapter 7, Creational Design Patterns, starts to explore the traditional design patterns in Node.js. In this chapter, you will learn about some of the most popular creational design patterns, namely the Factory pattern, the Revealing Constructor pattern, the Builder pattern, and the Singleton pattern.

- Chapter 8, Structural Design Patterns, continues the exploration of traditional design patterns in Node.js, covering structural design patterns such as Proxy, Decorator, and Adapter.

- Chapter 9, Behavioral Design Patterns, concludes the conversation around traditional design patterns in Node.js by introducing behavioral design patterns like Strategy, State, Template, Middleware, Command, and Iterator.

- Chapter 10, Universal JavaScript for Web Applications, explores one of the most interesting capabilities of modern JavaScript web applications: being able to share code between the frontend and the backend. Throughout this chapter, you will learn the basic principles of Universal JavaScript by building a simple web application using modern tools and libraries.

- Chapter 11, Advanced Recipes, takes a problem-solution approach to show you how some common coding and design intricacies can be approached with ready-to-use solutions.

- Chapter 12, Scalability and Architectural Patterns, teaches you the basic techniques and patterns for scaling a Node.js application.

- Chapter 13, Messaging and Integration Patterns, presents the most important messaging patterns, teaching you how to build and integrate complex distributed systems using Node.js and its ecosystem.