Book Image

Node.js Design Patterns - Third Edition

By : Mario Casciaro, Luciano Mammino
5 (1)
Book Image

Node.js Design Patterns - Third Edition

5 (1)
By: Mario Casciaro, Luciano Mammino

Overview of this book

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.
Table of Contents (16 chapters)
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To get the most out of this book you can download the example code files and the color images as per the instructions below.

Download the example code files

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  3. Click on Code Downloads.
  4. Enter the name of the book in the Search box and follow the on-screen instructions.

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Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here:

Conventions used

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning:

  • Code words in text: server.listen(handle)
  • Pathname: src/app.js
  • Dummy URL: http://localhost:8080

A block of code is generally formatted using StandardJS conventions ( and it is set as follows:

import zmq from 'zeromq'
async function main () {
  const sink = new zmq.Pull()
  await sink.bind('tcp://*:5017')
  for await (const rawMessage of sink) {
    console.log('Message from worker: ', rawMessage.toString())

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are highlighted in bold:

const wss = new ws.Server({ server })
wss.on('connection', client => {
  console.log('Client connected')
  client.on('message', msg => {
    console.log(`Message: ${msg}`)
    redisPub.publish('chat_messages', msg)

Any command-line input or output is written as follows:

node replier.js
node requestor.js

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "To explain the problem, we will create a little web spider, a command-line application that takes in a web URL as the input and downloads its contents locally into a file."

Warnings or important notes appear like this.

Tips and tricks appear like this.

Most URLs are linked through our own short URL system to make it easier for readers coming through the print edition to access them. These links are in the form