Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases now! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Node Cookbook
Node Cookbook

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

Arrow left icon
Profile Icon David Mark Clements Profile Icon Mathias Buus Madsen Profile Icon Elger Profile Icon Matteo Collina
Arrow right icon
Can$69.99
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
Can$38.99 Can$55.99
Paperback
Can$69.99
Subscription
Free Trial
Arrow left icon
Profile Icon David Mark Clements Profile Icon Mathias Buus Madsen Profile Icon Elger Profile Icon Matteo Collina
Arrow right icon
Can$69.99
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
Can$38.99 Can$55.99
Paperback
Can$69.99
Subscription
Free Trial
eBook
Can$38.99 Can$55.99
Paperback
Can$69.99
Subscription
Free Trial

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Table of content icon View table of contents Preview book icon Preview Book

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...

Left arrow icon Right arrow icon
Download code icon Download Code

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
Estimated delivery fee Deliver to Canada

Economy delivery 10 - 13 business days

Can$24.95

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jul 31, 2017
Length: 656 pages
Edition : 3rd
Language : English
ISBN-13 : 9781785880087
Languages :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Estimated delivery fee Deliver to Canada

Economy delivery 10 - 13 business days

Can$24.95

Product Details

Publication date : Jul 31, 2017
Length: 656 pages
Edition : 3rd
Language : English
ISBN-13 : 9781785880087
Languages :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
$19.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
$199.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just Can$6 each
Feature tick icon Exclusive print discounts
$279.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just Can$6 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total Can$ 195.97
Node Cookbook
Can$69.99
Mastering  Node.js
Can$69.99
Learning Node.js Development
Can$55.99
Total Can$ 195.97 Stars icon

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
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela