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Node Cookbook: Second Edition
Node Cookbook: Second Edition

Node Cookbook: Second Edition: Transferring your JavaScript skills to server-side programming is simplified with this comprehensive cookbook. Each chapter focuses on a different aspect of Node, featuring recipes supported with lots of illustrations, tips, and hints.

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Node Cookbook: Second Edition

Chapter 2. Exploring the HTTP Object

In this chapter, we will cover:

  • Processing POST data

  • Handling file uploads

  • Using Node as an HTTP client

  • Implementing download throttling

Introduction


In the previous chapter, we used the http module to create a web server. Now, we're going to look into some associated use cases beyond simply pushing content from the server to client. The first three recipes will explore how to receive data via client-initiated HTTP POST (and PUT) requests and in the final recipe, we'll demonstrate how to throttle a stream of outbound data.

Processing POST data


If we want to be able to receive POST data, we have to instruct our server how to accept and handle a POST request. In PHP, we could access our POST values seamlessly with $_POST['fieldname'], because it would block until an array value was filled. Contrariwise, Node provides low-level interaction with the 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

Getting ready

Let's create a server.js file ready for our code, and an HTML file called form.html, that contains the following:

<form method=post>
  <input type=text name=userinput1><br>
  <input type=text name=userinput2><br>
  <input type=submit>
</form>

For our purposes, we'll place form.html in the same folder as server.js. Though this is not generally a recommended practice, we should usually place our public code in a separate folder from our server code.

How to...

Handling file uploads


We cannot process an uploaded file in the same way we process other POST data. When a file input is submitted in a form, the browser processes the file into a multipart message.

Multipart was originally developed as an e-mail format allowing multiple pieces of mixed content to be combined into one message. If we attempted to receive the upload as a stream and write it to a file, we would have a file filled with multipart data instead of the file or files themselves. We need a multipart parser, the writing of which is more than a recipe can cover. So, we'll be using the well-known and battle-tested formidable module to convert our upload data into files.

Getting ready

Let's create a new uploads directory to store the uploaded files and get ready to make modifications to our server.js file from the previous recipe.

Note

If the owner of the Node process (for example, the user of the system that runs the node executable) isn't also the creator (and therefore owner) of the uploads...

Using Node as an HTTP client


The HTTP object doesn't just provide server capabilities, it also affords us with client functionality. We might want to use this functionality for a myriad of purposes: HTTP-based API's (such as a REST-based interface), website scraping for statistical processing or in the absence of an API, or the first step in automated UI testing. In this task, we're going to use http.get with process to fetch external web pages dynamically via the command line.

Getting ready

We are not creating a server. So in the name of convention, we should use a different name for our new file. Let's call it fetch.js.

How to do it...

The http.request method allows us to make requests of any kind (for example, GET, POST, DELETE, OPTION, and so on), but for GET requests, we can use the shorthand http.get method as shown in the following code:

var http = require('http');
var urlOpts = {host: 'www.nodejs.org', path: '/', port: '80'};
http.get(urlOpts, function (response) {
  response.on('data...

Implementing download throttling


Node provides pause and resume methods for incoming streams but not for outbound streams. Essentially, this means we can easily throttle upload speeds in Node, but download throttling requires a more creative solution.

Getting ready

We'll need a new server.js file along with a big enough file to serve. With the dd command-line program, we can generate a file for testing purposes, as follows:

dd if=/dev/zero of=50meg count=50 bs=1048576

The preceding command will create a 50 MB file named 50meg, which we'll be serving.

Note

For a similar Windows tool that can be used to generate a large file, check out http://www.bertel.de/software/rdfc/index-en.html.

How to do it...

To keep things as simple as possible, our download server will serve just one file, but we'll implement it in a way that allows us to easily plug in some router code to serve multiple files. First, we will require our modules and set up an options object for file and speed settings, as follows:

var http...
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What you will learn

  • Create different kinds of servers
  • Manipulate all kinds of data
  • Interface with various databases
  • Use streams for efficient, powerful data shuffling
  • Create realtime apps
  • Create commandline apps
  • Write and publish your own modules
  • Work with the Express framework
  • Get to grips with the module ecosystem
  • Explore with external remote APIs
  • Learn various security, encryption, and authentication techniques
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 25, 2014
Length: 378 pages
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Language : English
ISBN-13 : 9781783280438
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Node.js Developers
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Language : English
ISBN-13 : 9781783280438
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Node.js Developers
Languages :
Tools :

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Table of Contents

11 Chapters
Making a Web Server Chevron down icon Chevron up icon
Exploring the HTTP Object Chevron down icon Chevron up icon
Working with Data Serialization Chevron down icon Chevron up icon
Interfacing with Databases Chevron down icon Chevron up icon
Employing Streams Chevron down icon Chevron up icon
Going Real Time Chevron down icon Chevron up icon
Accelerating Development with Express Chevron down icon Chevron up icon
Implementing Security, Encryption, and Authentication Chevron down icon Chevron up icon
Integrating Network Paradigms Chevron down icon Chevron up icon
Writing Your Own Node Modules Chevron down icon Chevron up icon
Taking It Live Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.3
(7 Ratings)
5 star 57.1%
4 star 14.3%
3 star 28.6%
2 star 0%
1 star 0%
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Pethuru Raj Jun 06, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I recently got an opportunity to go through the second edition of the Node cookbook. This book is for JavaScript enthusiasts, engineers, and experts. This book vividly illustrates how to leverage your JavaScript skills to craft well-written server-side software applications. The book is stuffed and saturated with a number of easy-to-grasp examples with their source codes. All the tips, techniques, and technologies for implementing Node-inspired web and enterprise-scale applications are clearly explained by the author. This book is developed with the aim of lessening the workload of web application developers and moderating any kind of security risks. Beginning with making your own web server, the practical recipes in this cookbook are designed to smoothly help you progress to make full web applications, command-line applications, and Node modules. There are some critical additions in the second edition. With the surging popularity of big data analytics, NoSQL databases are gaining more market and mind shares these days. This book has separate chapters for describing in detail about web applications interfacing with various databases such as MySQL, MongoDB, and Redis. Additionally there are descriptions on working with web sockets, and interfacing with network protocols, such as SMTP. Additionally, there are recipes on handling streams of data, security implementations, writing your own Node modules, and different ways to take your apps live. The chapter 8 explains how to set up an SSL-secured web server, use the crypto module to create strong password hashes, and protect your users from cross-site request forgery attacks. The chapter 3 explains how to convert data from your apps into XML and JSON formats when sending to the browser or third-party APIs.In a nutshell, this book is a boon and handy guide for developers for bringing forth many kinds of specific as well as generic high-quality web applications using Node, which is emerging as the viable and venerable alternative to all the traditional web application development languages and frameworks.
Amazon Verified review Amazon
Héctor Aguado García Jul 31, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is an interesting book if you want develop applications in a javascript enviroment, NodeJS is right now a programming environment that is used increasingly in developing all types of web applications, and consists of executing javascript on the server side.The book is very well structured, talking about how to create a server, to how to create your own modules in node, through HTTP calls, data serialization, use of database, sockets at real-time communications, the express framework for web pages, and security settings on the server.It's especially suitable for senior profiles in javascript but with the amount of code snippets any developer could create their own applications with nodejs framework.Highly recommended, now I'll start developing my new website with nodejs, express and mongoDB with the help of the book!
Amazon Verified review Amazon
Chris Johnson May 30, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The author set the bar high with his first edition of Node Cookbook, this second edition takes it one step further. With easy to follow examples, use cases and tips, this book manages to instruct and teach the basics and some high level node.js practices with ease. It even touches on the bleeding edge of development with express 4 just as it has been released. I would highly recommend this to anyone starting out in Node.js looking at building applications and scripts for the server.
Amazon Verified review Amazon
Doug Duncan Sep 26, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
David has updated his original writing of this book and the second edition is just as good, if not better than the first. He's updated the text and source code to use newer packages. In addition to these updates and an added recipe in a chapter or two, David has also added a new chapter covering Stream Processing with four new recipes.The book still stays at the 5 stars I gave the first edition, and I'm looking forward to reading anything else the authors puts out.
Amazon Verified review Amazon
Rohit Sep 25, 2014
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I had the chance of going through Node Cookbook. I was trying my hands on Node.js (with around 1 month of juggling with the paradims of Node.js). I found this book to be useful. It had ample examples for the topics covered and I liked the sections relating to Encryption and Socket.io. Helped me in my project. Overall its a good read.
Amazon Verified review Amazon
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