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- Herausgeber: Packt Publishing
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
Build well-structured, testable applications and APIs using hapi.js
About This Book
- With the help of this book, you will improve your productivity as a developer and that of your team by focusing on business logic utilizing the structure that Hapi.js provides
- You will be introduced to a real-world problem and we'll demonstrate how to use the tools Hapi provides to resolve it
- This is the only book with a learn-by-example approach
Who This Book Is For
If you are a JavaScript developer with or without Node.js experience and would like to learn to build applications, APIs, and web servers with the best-in-class framework hapi.js, this book is perfect for you.
What You Will Learn
- Increase your productivity by taking advantage of the out-of-the-box features hapi.js provides
- Build secure API servers
- Create websites and applications using your favorite templating language
- Leverage hapi.js plugins to better structure your codebase
- Simplify your security workflows with the built-in authentication and authorization functionality of hapi.js
- Ensure application reliability with testing and code coverage
- Reduce code complexity using reusable validation logic with joi
- Gather insight into your application performance via logging
- Start the journey to building robust production-ready applications
In Detail
This book will introduce hapi.js and walk you through the creation of your first working application using the out-of-the-box features hapi.js provides. Packed with real-world problems and examples, this book introduces some of the basic concepts of hapi.js and Node.js and takes you through the typical journey you'll face when developing an application. Starting with easier concepts such as routing requests, building APIs serving JSON, using templates to build websites and applications, and connecting databases, we then move on to more complex problems such as authentication, model validation, caching, and techniques for structuring your codebase to scale gracefully. You will also develop skills to ensure your application's reliability through testing, code coverage, and logging.
By the end of this book, you'll be equipped with all the skills you need to build your first fully featured application. This book will be invaluable if you are investigating Node.js frameworks or planning on using hapi.js in your next project.
Style and approach
This book takes a step-by-step approach to building an application or web server using hapi.js though examples.
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Seitenzahl: 215
Veröffentlichungsjahr: 2016
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Table of Contents
Getting Started with hapi.js
Getting Started with hapi.js
Copyright © 2016 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: April 2016
Production reference: 1060416
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78588-818-2
www.packtpub.com
Credits
Author
John Brett
Reviewer
Jan Lehnardt
Acquisition Editor
Reshma Raman
Content Development Editor
Mehvash Fatima
Technical Editor
Dhiraj Chandanshive
Copy Editor
Sonia Mathur
Project Coordinator
Kinjal Bari
Proofreader
Safis Editing
Indexer
Tejal Daruwale Soni
Production Coordinator
Melwyn Dsa
Cover Work
Melwyn Dsa
Foreword
hapi is a toolkit for web applications (and other HTTP servers) built by people with twice my experience and at least 10 times the smarts. They got the right team together and managed to work with the freedom to get it right this one last time—and they delivered.
hapi is also built by people who understand how to create, foster, and maintain a healthy and inclusive open source community, manage a responsible yet speedy release process, and be all around lovely people. If you are an end user or want to start contributing to the hapi ecosystem, you'll have great fun on your way with the clever technology and, even more so, with the great people.
From the first examples in the first chapter that you work through on your own to a fullfledged system that a large team can work on productively without stepping on each other's toes, Getting Started with hapi.js takes you on the journey to master everything you need to build everything from a hobby project to the most popular site on the Web.
The third step of my "usual process" of working with hapi is this: loving hapi even more.
I know you will, too.
Jan Lehnardt
CEO, neighbourhood.ie
About the Author
John Brett is a software engineer passionate about new technologies, open source, and building useful software while travelling the world. Starting out in Ireland with a degree in Computer Science and Software Engineer, he went on to join IBM through their premier internship Extreme Blue, later working on collaboration software as part of IBM's Software Group. There, John mainly worked with PHP and JavaScript, only working with Node.js in his spare time.
Later in his career, John moved to a growing SAAS company called D4H Technologies. As a lead engineer there, he developed tools to aid emergency response teams globally, all from a lighthouse in Dublin, Ireland. Here, John got more exposure to Node.js, leading D4H's first venture into Node using hapi.js, later joining the hapi.js core team
About the Reviewer
Jan Lehnardt is a developer and business person from Berlin, Germany. He is the Vice President of Apache CouchDB (http://couchdb.apache.org), the database that syncs at the Apache Software Foundation, and a co-inventor of Hoodie (http://hood.ie), the web app framework for frontend developers. Jan is the cofounder and CEO of Neighbourhoodie Software, a product and support company based on Hoodie, CouchDB, and general web-nerdery in Berlin. They are also behind http://greenkeeper.io, a service that sends you a pull request when any of your npm dependencies get an update. In his spare time, Jan co-organises JSConf EU, Europe's favorite JavaScript conference.
www.PacktPub.com
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Preface
Node.js has become one of the most exciting development platforms in recent times. Combined with the largest package ecosystem in the world, npm, it has become a game changer in enabling higher developer productivity strides in improved application performance and a more enjoyable developer experience overall, which has lead to widespread industry adoption.
This book is focused on hapi.js, which is a rich Node.js framework for building applications and services with the goal of enriching the development experience further. It aims to increase your productivity by providing the tools you need when you want them and getting out of the away when you don't.
Developed by the talented team at Walmart Labs to handle the pressures of the Black Friday traffic, the busiest day of online retail on the calendar, it is proven at scale and has since seen wider adoption, participation, and collaboration from the wider community. Its growing adoption can be put down to how easy it is to use and get started with along with its proven stability.
The Node.js programming paradigm is quite different to other server-side technologies, and as such, it can be common for developers to get stuck on design and programming problems, such as dealing with the asynchronous nature of JavaScript and structuring an application as it grows. This is where hapi.js excels; it enables developers to focus on writing reusable business logic instead of losing time focusing on building application infrastructure without obscuring important implementation details.
While it was originally built as a framework focused toward the rapid development of RESTful APIs, thanks to its fantastic ecosystem, it has grown into a fully-fledged framework suited to building static file servers, websites, and web applications with excellent support for building real-time applications added more recently.
Due to the modular plugin approach it provides, it allows an easier collaboration between teams in larger enterprise environments as well as an easy point of integration for third-party libraries.
If you plan to use hapi.js in your next project, whether it be a side project, work project, or open source project, this book seeks to give you an excellent point at which to get started and solidify any knowledge you might have if you have used Node or hapi.js before.
What this book covers
Chapter 1, Introducing hapi.js, serves as an introduction to hapi.js and some prerequisite learning of Node.js. It explains what hapi.js is, who created it, why it needs to exist, and how to create a simple hapi.js server.
Chapter 2, Adding Functionality by Routing Requests, is the beginning of your journey of building applications with hapi.js. It will cover some basics, such as routing and building APIs, websites, and applications with hapi.js, and will also cover some differences in design compared to other Node.js-based frameworks.
Chapter 3, Structuring Your Codebase with Plugins, introduces the plugin API in hapi.js, which is one of its core features. It will walk you through how to simplify an application structure gracefully using plugins and also cover server orchestration using modules from the hapi.js ecosystem.
Chapter 4, Adding Tests and the Importance of 100% Code Coverage, explores the importance of adding tests to an application. It will introduce you to some of the testing tools available in the hapi.js ecosystem and also guide you toward getting 100% code coverage with your tests.
Chapter 5, Security Applications with Authentication and Authorization, takes a deep dive into how authentication works in hapi.js with practical examples of different authentication protocols, including social logins. It also demonstrates scopes and how to use them to add permission levels to your applications.
Chapter 6, The joi of Reusable Validation, deals with the topic of validation in applications using the joi validation library from the hapi.js ecosystem. It covers how to validate objects and route configurations and how to reuse this to generate documentation for applications.
Chapter 7, Making Your Application Production Ready, covers multiple topics to leave you ready to build your first application, such as integrating popular databases and adding caching and logging to applications to help scale an application as well as give it visibility when running in a production environment. It also covers a variety of other sources to continue learning more about hapi.js.
What you need for this book
To try out the examples shown in this book, you will need a working installation of Node.js version 4.x or greater, as well as npm. You will need to be somewhat familiar with the terminal in order to launch applications and install modules from npm. You will also need an editor to modify the code and a browser to view your applications running.
Who this book is for
This book is for a developer with some JavaScript knowledge, with or without Node.js experience, looking to build their first applications or even just learn more about a best-in-class framework to build APIs and applications: hapi.js.
Conventions
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, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "This creates a directory called hapi-hello, and makes it the current directory."
A block of code is set as follows:
When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:
Any command-line input or output is written as follows:
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: "If you navigate to this URL, you should have Hello World returned to you."
Note
Warnings or important notes appear in a box like this.
Tip
Tips and tricks appear like this.
Reader feedback
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To send us general feedback, simply e-mail <[email protected]>, and mention the book's title in the subject of your message.
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Customer support
Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase.
Downloading the example code
You can download the example code files from your account at http://www.packtpub.com for all the Packt Publishing books you have purchased. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.
Downloading the color images of this book
We also provide you with a PDF file that has color images of the screenshots/diagrams used in this book. The color images will help you better understand the changes in the output. You can download this file from http://www.packtpub.com/sites/default/files/downloads/GettingStartedwithhapijs_ColorImages.pdf.
Errata
Although we have taken every care to ensure the accuracy of our content, mistakes do happen. If you find a mistake in one of our books—maybe a mistake in the text or the code—we would be grateful if you could report this to us. By doing so, you can save other readers from frustration and help us improve subsequent versions of this book. If you find any errata, please report them by visiting http://www.packtpub.com/submit-errata, selecting your book, clicking on the Errata Submission Form link, and entering the details of your errata. Once your errata are verified, your submission will be accepted and the errata will be uploaded to our website or added to any list of existing errata under the Errata section of that title.
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We appreciate your help in protecting our authors and our ability to bring you valuable content.
Questions
If you have a problem with any aspect of this book, you can contact us at <[email protected]>, and we will do our best to address the problem.
The hapi philosophy versus other frameworks
Throughout Walmart's journey of rebuilding their mobile services tier and working with other frameworks, they realized that certain values were vital to building applications in Node for keeping the code intuitive, maintainable, and scalable. As a result, hapi centered around the following concepts:
