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JavaScript is the backbone of the modern web, powering nearly every web app’s user interface. Node.js is JavaScript for the server. This book shows you how to develop small, fast, low-profile, useful, networked applications. You’ll write asynchronous, non-blocking code using Node’s style and patterns. You’ll cluster and load balance your services with Node core features and third-party tools. You’ll work with many protocols, creating RESTful web services, TCP socket clients and servers, and more.

This short book packs a hefty dose of Node.js. You’ll test your code’s functionality and performance under load. You’ll learn important aspects of Node development—from its architecture and core, to its ecosystem of third-party modules. You’ll discover how Node pairs a server-side event loop with a JavaScript runtime to produce screaming fast, non-blocking concurrency. Through a series of practical programming domains, you’ll use the latest available ECMAScript Harmony features and harness key Node classes such as EventEmitter and Stream. Throughout the book, you’ll develop real programs that are small, fast, low-profile, and useful.

Get ready to join a smart community that’s rapidly advancing the state of the art in web development.

Jim R. Wilson is a principal software engineer at Brightcove. He’s contributed to several open-source projects including corridor, HBase, MediaWiki, and Node.js. In addition to coding and writing, Jim is a speaker and co-author of Seven Databases in Seven Weeks.

Acknowledgments
Preface
Why Node.js the Right Way
What’s in This Book
What This Book Is Not
Code Examples and Conventions
Online Resources
Getting Started
Node’s Niche
How Node Applications Work
Aspects of Node.js Development
Get Node.js
Wrangling the File System
Programming for the Node.js Event Loop
Spawning a Child Process
Capturing Data from an EventEmitter
Reading and Writing Files Asynchronously
The Two Phases of a Node Program
Wrapping Up
Networking with Sockets excerpt
Listening for Socket Connections
Implementing a Messaging Protocol
Creating Socket Client Connections
Testing Network Application Functionality
Extending Core Classes in Custom Modules
Wrapping Up
Robust Messaging Services
Advantages of ØMQ
Importing External Modules with npm
Message-Publishing and -Subscribing
Responding to Requests
Routing and Dealing Messages
Clustering Node.js Processes
Pushing and Pulling Messages
Wrapping Up
Accessing Databases
Advantages of CouchDB
Creating a Package
Making RESTful Requests
Importing Real Data
Unit Testing with Nodeunit
Throttling Node.js
Querying Data with Mapreduce Views
Wrapping Up
Scalable Web Services
Advantages of Express
Serving APIs with Express
Writing Modular Express Services
RESTful APIs with Promises
Yielding Control with Generators
Using Generators with Promises
Wrapping Up
Web Apps excerpt
Storing Express Sessions in Redis
Creating a Single-Page Web Application
Authenticating with Passport
Authorizing APIs with Custom Middleware
Creating Authenticated APIs
Client-Side MVC
Wrapping Up
Parting Thoughts
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