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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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Profile Icon Ray Rischpater Profile Icon Brian Ritchie Profile Icon Ray Rischpater
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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 : Jun 25, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781785286902
Category :
Web Development
Languages :
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Concepts :
Web Programming

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Category :
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Languages :
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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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About the 3 authors

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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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Profile icon Ray Rischpater
Ray Rischpater
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Ray Rischpater is a software engineer and author with over twenty years of industry experience and sixteen books to his credit. Beginning with software development for mobile platforms he's done work in several areas, including mobile, web services, building tools for mapping and geospatial engineering, and applying machine learning to geospatial processing problems. During this time, he's participated in the development of Internet technologies and custom applications for Newton, Magic Cap, Palm OS, Java ME, Qualcomm BREW, Apple iOS, and Google Android, as well as several proprietary platforms. Over the last six years, his focus has shifted from mobile applications and services to building tools, software processes, and machine learning models to facilitate mapping the real world. Presently, he's employed as a software engineering manager at Uber, doing work on mapping and machine learning. When not writing for or about software development, he enjoys making music, hiking, and photography with his family and friends in and around the San Lorenzo Valley in central California. When he's able, he also provides public service through amateur radio as the licensed Amateur Extra station KF6GPE. Other books you may have worked on. Microsoft Mapping with Carmen Au (Apress, 2013) and Application Development with Qt Creator, Second Edition (Packt Publishing, 2014). I've written several other books, including Beginning Java ME Platform (Beginning from Novice to Professional) (Apress, 2008), Software Development for the QUALCOMM BREW Platform (Apress, 2003), Wireless Web Development, First Edition (Apress, 2002), and Wireless Web Development, Second Edition (Apress, 2004). I'd like to thank my wife, Meg Given, for her patience as I worked on yet another book project.
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  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela