Book Image

Getting Started with hapi.js

Book Image

Getting Started with hapi.js

Overview of this book

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.
Table of Contents (15 chapters)
Getting Started with hapi.js
Credits
Foreword
About the Author
About the Reviewer
www.PacktPub.com
Preface
5
Securing Applications with Authentication and Authorization
Index

hapi request object


In hapi, the goal is never to monkey-patch or modify any of the normal Node objects or methods, but only to provide an extra layer around them to access the important parts.

Note

Monkey patching is the method of overriding or extending the behavior of a method. For example, let's create an add function that returns the sum of two numbers:

let add = function (a, b) {
  return a + b;
}

We now want to log in to the console every time this is called, without altering the existing behavior. We would modify it by doing the following:

let oldAdd = add;
add = function (a, b) {
  console.log('add was called…');
  return oldAdd(a, b);
}

Now every time add is called, it will print add was called…, and return the sum just as before. This can be useful in modifying core language methods, but is not a recommended pattern, as it can cause very hard-to-debug side effects. I generally limit doing this to writing tests or debugging code.

This is the case with the hapi request object. The hapi...