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Home > Web Development > Web Programming > The JavaScript JSON Cookbook
The JavaScript JSON Cookbook
The JavaScript JSON Cookbook

The JavaScript JSON Cookbook: Over 80 recipes to make the most of JSON in your desktop, server, web, and mobile applications

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The JavaScript JSON Cookbook

Chapter 2. Reading and Writing JSON on the Server

In the previous chapter, we looked at JSON handling in some of the most common client-side environments. In this chapter, we will turn our attention to server-side JSON encoding and decoding. We'll look at recipes on how to do this in the following environments:

  • Reading and writing JSON in Clojure
  • Reading and writing JSON in F#
  • Reading and writing JSON in Node.js
  • Reading and writing JSON in PHP
  • Reading and writing JSON in Ruby

Some languages, such as C++ and Java, are used on both client-side and server-side; for these, refer to Chapter 1, Reading and Writing JSON on the Client (one exception is the discussion of JSON in Node.js because Node.js plays a big role in subsequent chapters of this book).

Reading and writing JSON in Clojure

Clojure is a modern Lisp variant running on top of the Java and Microsoft Common Language Runtime (CLR) platforms. As such, you can use the facilities we discussed in Chapter 1, Reading and Writing JSON on the Client, to convert between JSON and objects in the native runtime, but there's a better way, and that is the Clojure's data.json module, available at https://github.com/clojure/data.json.

Getting ready

To begin, you need to specify your dependency in the data.json module. You can do this with the following dependency in your Leiningen file:

[org.clojure/data.json "0.2.5"]

If you're using Maven, you'll want this:

<dependency>
<groupId>org.clojure</groupId>
<artifactId>data.json</artifactId>
<version>0.2.5</version>
</dependency>

Tip

Of course, the version of data.json may change between the time I write this and the time you include it in your project as a dependency. Check...

Reading and writing JSON in F#

F# is a language running on the CLR and .NET that excels in functional and object-oriented programming tasks. Because it's on top of .NET, you can use third-party libraries such as Json.NET (mentioned in Chapter 1, Reading and Writing JSON on the Client) to convert between JSON and CLR objects. However, there's a better way: the open source library F# Data, which creates native data type providers to process data in a number of different structured formats, including JSON.

Getting ready

Begin by getting a copy of the library, available at https://github.com/fsharp/FSharp.Data. Once you download it, you'll need to build it; you can do this by running the build.cmd build batch file that comes with the distribution (for details, see the F# Data website). Alternatively, you can find the same package on NuGet, by choosing Manage NuGet Packages from the Projects menu and searching for F# Data. Once you find it, click on Install. I prefer using NuGet...

Reading and writing JSON with Node.js

Node.js is a JavaScript environment for server-side programming based on the same high-performance JavaScript runtime Google built for Chrome, backed by Joyent. Its high performing and asynchronous programming model makes it an excellent environment for custom web servers and it's used by major companies, including Walmart, in production settings.

Getting ready

Because we'll use Node.js in the next two chapters as well, it's worth pointing out to you how to download and install it, even if your daily server environment is something more like Apache or Microsoft IIS. You'll need to go to http://www.nodejs.org/ and download the installer from the front page. This will install all you need to run Node.js and npm, the package manager used by Node.js.

Tip

After installing on Windows, I had to reboot to get the Windows shell to correctly find the node and npm commands that the Node.js installer installed.

Once you get Node.js installed, we...

Reading and writing JSON in PHP

PHP is a popular server-side scripting environment easily integrated with the Apache and Microsoft IIS web servers. It has native support for simple JSON encoding and decoding.

How to do it...

PHP provides two functions, json_encode and json_decode, to encode and decode JSON respectively.

You can pass primitive types or user-defined classes to json_encode and it returns a string containing the JSON representing the object. For example:

$result = array(
"call" =>"KF6GPE",
"type" =>"l",
"time" =>"1399371514",
"lasttime" =>"1418597513",
"lat" =>37.17667,
"lng" =>-122.14650,
"result" =>"ok");
$json = json_encode($result);

This creates a string $json containing the JSON representation of our associative array.

The json_encode function takes an optional second argument, which lets you specify arguments to the encoder. The arguments...

Reading and writing JSON in Ruby

Ruby provides the json gem for JSON handling. In earlier versions of Ruby, you have to install this gem yourself; it's part of the base installation from Ruby 1.9.2 and onwards.

Getting ready

If you're running an earlier version of Ruby than Ruby 1.9.2, first install the gem with the following command:

gem install json

Note that Ruby's implementation is in C, so installing the gem may require a C compiler. If you don't have one installed on your system, you can install the pure Ruby implementation of the gem using the following command:

gem install json_pure

Regardless of whether you need to install the gem or not, you'll need to include it in your code. To do this, include both rubygems and json or json/pure, depending on which gem you installed; do this using require, like this:

require 'rubygems'
require 'json'

The preceding code handles the former case, while the following code handles the latter:

require 'rubygems...
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Description

If you're writing applications that move structured data from one place to another, this book is for you. This is especially true if you've been using XML to do the job because it's entirely possible that you could do much of the same work with less code and less data overhead in JSON. While the book's chapters make some distinction between the client and server sides of an application, it doesn't matter if you're a frontend, backend, or full-stack developer. The principles behind using JSON apply to both the client and the server, and in fact, developers who understand both sides of the equation generally craft the best applications.

What you will learn

  • Learn to use JSON in a type-safe way to avoid common data typing errors Exchange data with NoSQL databases such as MongoDB and CouchDB with JSON Make the most of JSON in AJAX web applications, with or without a framework Exchange data between servers and mobile applications running on Android and iOS with JSON Practical examples to show you how to leverage JSON from a variety of application domains

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 25, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781785284359
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Programming

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Publication date : Jun 25, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781785284359
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Programming

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The JavaScript JSON Cookbook
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Table of Contents

11 Chapters
1. Reading and Writing JSON on the Client Chevron down icon Chevron up icon
1. Reading and Writing JSON on the Client
Introduction
Reading and writing JSON in JavaScript
Reading and writing JSON in C++
Reading and writing JSON in C#
Reading and writing JSON in Java
Reading and writing JSON in Perl
Reading and writing JSON in Python
2. Reading and Writing JSON on the Server Chevron down icon Chevron up icon
2. Reading and Writing JSON on the Server
Reading and writing JSON in Clojure
Reading and writing JSON in F#
Reading and writing JSON with Node.js
Reading and writing JSON in PHP
Reading and writing JSON in Ruby
3. Using JSON in Simple AJAX Applications Chevron down icon Chevron up icon
3. Using JSON in Simple AJAX Applications
Introduction
Creating an XMLHttpRequest object
Making an asynchronous request for data
Sending JSON to your web server
Accepting JSON using Node.js
Getting the progress of an asynchronous request
Parsing the returned JSON
Issuing a web service request using Node.js
4. Using JSON in AJAX Applications with jQuery and AngularJS Chevron down icon Chevron up icon
4. Using JSON in AJAX Applications with jQuery and AngularJS
Introduction
Adding a dependency to jQuery to your web page
Requesting JSON content using jQuery
Sending JSON to your web server using jQuery
Getting the progress of a request using jQuery
Parsing the returned JSON using jQuery
Adding a dependency to AngularJS to your web page
Requesting JSON content using AngularJS
Sending JSON to your web server using AngularJS
Getting the progress of a request using AngularJS
Parsing the returned JSON using AngularJS
5. Using JSON with MongoDB Chevron down icon Chevron up icon
5. Using JSON with MongoDB
Introduction
Setting up MongoDB
Installing the MongoDB database driver for Node.js
Installing the express module for Node.js
Connecting to a MongoDB database using Node.js
Creating a document in MongoDB using Node.js
Searching for a document in MongoDB with Node.js
Updating a document in MongoDB with Node.js
Deleting a document in MongoDB using Node.js
Using REST to search MongoDB
Using REST to create a document in MongoDB
Using REST to update a document in MongoDB
Using REST to delete a document in MongoDB
6. Using JSON with CouchDB Chevron down icon Chevron up icon
6. Using JSON with CouchDB
Introduction
Installing and setting up CouchDB and Cradle
Connecting to a CouchDB database using Node.js and Cradle
Creating a CouchDB database using Node.js and Cradle
Creating a document in CouchDB using Node.js and Cradle
Setting up a data view in CouchDB with Node.js and Cradle
Searching for a document in CouchDB with Node.js and Cradle
Updating a document in CouchDB with Node.js and Cradle
Deleting a document in CouchDB using Node.js and Cradle
Using REST to enumerate CouchDB records
Using REST to search CouchDB
Using REST to upsert a document in CouchDB
Using REST to delete a document in CouchDB
7. Using JSON in a Type-safe Manner Chevron down icon Chevron up icon
7. Using JSON in a Type-safe Manner
Introduction
How to deserialize an object using Json.NET
How to handle date and time objects using Json.NET
How to deserialize an object using gson for Java
How to use TypeScript with Node.js
How to annotate simple types using TypeScript
How to declare interfaces using TypeScript
How to declare classes with interfaces using TypeScript
Using json2ts to generate TypeScript interfaces from your JSON
8. Using JSON for Binary Data Transfer Chevron down icon Chevron up icon
8. Using JSON for Binary Data Transfer
Introduction
Encoding binary data as a base64 string using Node.js
Decoding binary data from a base64 string using Node.js
Encoding and decoding binary data as a base64 string using JavaScript in the browser
Encoding data as BSON using Json.NET
Decoding data from BSON using Json.NET
Using a DataView to access an ArrayBuffer
Encoding and decoding base64 using an ArrayBuffer
Compressing object-body content from a Node.js server built using the express module
9. Querying JSON with JSONPath and LINQ Chevron down icon Chevron up icon
9. Querying JSON with JSONPath and LINQ
Introduction
Using the JSONPath dot-notation to query JSON documents
Using JSONPath bracket-notation to query JSON documents
Using JSONPath scripting to construct more complicated queries
Using JSONPath in your web application
Using JSONPath in your Node.js application
Using JSONPath in your PHP application
Using JSONPath in your Python application
Using JSONPath in your Java application
Using JSONPath with SelectToken to query for JSONPath expressions in your C# application
Using LINQ with Json.NET to query JSON in your C# application
10. JSON on Mobile Platforms Chevron down icon Chevron up icon
10. JSON on Mobile Platforms
Introduction
Parsing JSON on Android
Generating JSON on Android
Parsing JSON on iOS in Objective-C
Generating JSON on iOS in Objective-C
Parsing JSON on iOS using Swift
Generating JSON on iOS using Swift
Parsing JSON using Qt
Generating JSON using Qt
Index Chevron down icon Chevron up icon
Index

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Profile icon Ray Rischpater
Ray Rischpater
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Ray Rischpater is an engineer with over 20 years of experience in writing about and developing for mobile computing platforms. He holds a bachelor's degree in mathematics from the University of California and is a member of the IEEE, ACM, and ARRL. He has participated in the development of internet technologies and custom applications. Currently, he's employed as a technical program manager at Google. In his free time, he enjoys hiking and photography with his family and friends. He provides public service through amateur radio at the licensed station KF6GPE and also irregularly blogs. He has authored this book's previous editions as well as several other books.
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Profile icon Brian Ritchie
Brian Ritchie
Brian Ritchie is a software architect with a track record of developing large scale enterprise systems and leading development teams through difficult scalability challenges. Brian has 20 years of experience in Software Development and is currently Chief Architect at PaySpan, Inc. which provides innovative reimbursement solutions to healthcare payers and providers. Brian is active in the development community giving presentations to local user groups and code camps. He has also contributed to Mono (the open source version of .NET) and various other open source projects. You can follow him on Twitter at http://twitter.com/brian_ritchie and read his blog at http://weblogs.asp.net/britchie.
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