Book Image

Node Cookbook. - Third Edition

By : David Mark Clements, Mathias Buus Madsen, Peter Elger, Matteo Collina
Book Image

Node Cookbook. - Third Edition

By: David Mark Clements, Mathias Buus Madsen, Peter Elger, Matteo Collina

Overview of this book

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.
Table of Contents (12 chapters)

Receiving POST data

If we want to be able to receive POST data, we have to instruct our server on how to accept and handle a POST request.

In a language where I/O blocking is the primary runtime behavior, accessing POST body data would be as straightforward as accessing a property.

For instance, in PHP we could access our POST values with $_POST['fieldname']; the execution thread would block until an array value was filled.

Contrariwise, Node provides a low level interaction with the asynchronous flow of HTTP data allowing us to interface with the incoming message body as a stream, leaving it entirely up to the developer to turn that stream into usable data.

For more information on streams, see Chapter 4, Using Streams


Getting ready