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Node Cookbook
Node Cookbook

Node Cookbook: Actionable solutions for the full spectrum of Node.js 8 development , Third Edition

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Profile Icon David Mark Clements Profile Icon Mathias Buus Madsen Profile Icon Elger Profile Icon Matteo Collina
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€41.99
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7 (3 Ratings)
Paperback Jul 2017 656 pages 3rd Edition
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Arrow left icon
Profile Icon David Mark Clements Profile Icon Mathias Buus Madsen Profile Icon Elger Profile Icon Matteo Collina
Arrow right icon
€41.99
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7 (3 Ratings)
Paperback Jul 2017 656 pages 3rd Edition
eBook
€22.99 €32.99
Paperback
€41.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€22.99 €32.99
Paperback
€41.99
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Free Trial
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Node Cookbook

Writing Modules

This chapter covers the following recipes:

  • Scaffolding a module
  • Installing dependencies
  • Writing module code
  • Publishing a module
  • Using a private repository

Introduction

In idiomatic Node, the module is the fundamental unit of logic. Any typical application or system consists of generic code and application code. As a best practice, generic shareable code should be held in discrete modules, which can be composed together at the application level with minimal amounts of domain-specific logic.

In this chapter, we'll learn how Node's module system works, how to create modules for various scenarios, and how we can reuse and share our code.

Scaffolding a module

Let's begin our exploration by setting up a typical file and directory structure for a Node module. At the same time, we'll be learning how to automatically generate a package.json file (we refer to this throughout the book as initializing a folder as a package). We'll also configure npm (Node's package managing tool) with some defaults, which can then be used as part of the package generation process.

In this recipe, we'll create the initial scaffolding for a full Node module.

Getting ready

Installing Node
If we don't already have Node installed, we can go to nodejs.org to pick up the latest version for our operating system.

If Node is on our system, then so is the npm executable...

Installing dependencies

The Node.js module system, along with its vast ecosystem enables a high degree of composability. A lot of modules are small and do one thing well, and this allows us to composite our own modules on top of other modules.

In this recipe, we will install a dependency.

Getting ready

For this recipe, all we need is Command Prompt open in the hsl-to-hex folder from the Scaffolding a module recipe.

How to do it...

Our hsl-to-hex module can be implemented in two steps:

  1. Convert the hue degrees, saturation percentage, and luminosity percentage to corresponding...

Writing module code

Now, it's time to engage in actual implementation details.

In this recipe, we will write some code for our hsl-to-hex module.

Getting ready

Let's ensure that we have a folder called hsl-to-hex, with a package.json file in it. The package.json file should contain hsl-to-rgb-for-reals as a dependency. If there isn't a node_modules folder, we need to ensure that we run npm install from the command line with the working directory set to the hsl-to-hex directory.

To get started, let's create a file called index.js in the hsl-to-hex folder, then open it in our favorite text editor.

How to do it...

Publishing a module

In this recipe, we'll prepare our module to be published; then, we'll publish it as a scoped package.

Getting ready

We will publish our hsl-to-hex module that we've been working on in the preceding recipes. We'll also want the (original) tests we wrote in the Adding tests portion of the There's more section of the Writing module code recipe.

If we don't have an npmjs.org account, we'll need to head over to https://www.npmjs.com/signup and get an account. Keep the npm username handy; we will need it.

How to do it...

...

Using a private repository

There can be multiple reasons for using a private repository. From a personal perspective, it can be a useful caching mechanism or test-bed when run locally. From an organizational perspective, it's usually about control.

While open source has been fundamental to advancements in every industry that has been touched by the digital era, there's still a case for in-house only code. In some cases, it may be that code is specific to an organization or reveals internal details that should be trade secrets. In other cases, it may be an archaic though impassable proprietary culture. At any rate, it makes all the more sense to share resources when living in a gated community.

In this recipe, we'll investigate setting up a personal module registry that can be deployed as an internal registry to provide a platform for code reuse across an organization...

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Key benefits

  • Actionable recipes across the full spectrum of Node.js development
  • Cutting edge techniques and tools for measuring and improving performance
  • Best practices for creating readily-scalable production systems

Description

Today's web demands efficient real-time applications and scalability. Asynchronous event-driven programming is ideal for this, and this is where Node.js comes in. Server-side JavaScript has been here since the 90s, but Node got it right. With Node for tooling and server-side logic, and a browser-based client-side UI, everything is JavaScript. This leads to rapid, fluid development cycles. The full-stack, single language experience means less context-switching between languages for developers, architects and whole teams. This book shows you how to build fast, efficient, and scalable client-server solutions using the latest versions of Node. The book begins with debugging tips and tricks of the trade, and how to write your own modules. Then you'll learn the fundamentals of streams in Node.js, discover I/O control, and how to implement the different web protocols. You'll find recipes for integrating databases such as MongoDB, MySQL/MariaDB, Postgres, Redis, and LevelDB. We also cover the options for building web application with Express, Hapi and Koa. You will then learn about security essentials in Node.js and advanced optimization tools and techniques. By the end of the book you will have acquired the level of expertise to build production-ready and scalable Node.js systems. The techniques and skills you will learn in this book are based on the best practices developed by nearForm, one of the leaders in Node implementations, who supported the work of the authors on this book.

Who is this book for?

If you have good knowledge of JavaScript and want to build fast, efficient, scalable client-server solutions, then this book is for you. Some experience with Node.js is assumed to get the most out of this book. If working from a beginner level Node Cookbook 2nd Edition is recommended as a primer for Node Cookbook 3rd Edition.

What you will learn

  • Debug Node.js programs
  • Write and publish your own Node.js modules
  • Detailed coverage of Node.js core API's
  • Use web frameworks such as Express, Hapi and Koa for accelerated web application development
  • Apply Node.js streams for low-footprint data processing
  • Fast-track performance knowledge and optimization abilities
  • Persistence strategies, including database integrations with MongoDB, MySQL/MariaDB, Postgres, Redis, and LevelDB
  • Apply critical, essential security concepts
  • Use Node with best-of-breed deployment technologies: Docker, Kubernetes and AWS
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Length: 656 pages
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Language : English
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Table of Contents

11 Chapters
Debugging process* Chevron down icon Chevron up icon
Writing Modules Chevron down icon Chevron up icon
Coordinating I/O Chevron down icon Chevron up icon
Using Streams Chevron down icon Chevron up icon
Wielding Web Protocols Chevron down icon Chevron up icon
Persisting to Databases Chevron down icon Chevron up icon
Working with Web Frameworks Chevron down icon Chevron up icon
Dealing with Security Chevron down icon Chevron up icon
Optimizing Performance Chevron down icon Chevron up icon
Building Microservice Systems Chevron down icon Chevron up icon
Deploying Node.js Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7
(3 Ratings)
5 star 66.7%
4 star 33.3%
3 star 0%
2 star 0%
1 star 0%
Tessarolo Tommaso Sep 02, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Per chi vuole approfondire differenti tecniche di programmazione di Node.js questo libro è un must. Si parte dal debugging, passando per l'ottimizzazione, la gestione degli stream e quindi alla descrizione di un approccio "manuale" per la costruzione di un sistema a microservices, arrivando al deploy in produzione. Ben scritto, semplice da capire, con molti spunti e tanto codice da studiare.
Amazon Verified review Amazon
Phil Aug 08, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Reading through on Mac Kindle Reader, content is accessible, structure is clear and straightforward.. wish I'd bought it sooner, thanks!
Amazon Verified review Amazon
SLS Feb 17, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Really good material if you need to check how to do something. If you are knowledgeable in express and want to try out koa, the book will help with things like that. While not a book I or anyone should read front to back, still a great reference book.
Amazon Verified review Amazon
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