Table of Content

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How JSON Works ?

In JSON we can have 2 conventions to represent Data.

• We can store data in JSON using two types of notations.
• Using Array Notation we can store data in array and can easily parse data using array index.
• Object notation creates key-value pair to store data and retrieves each record using Key.

Different Types of Notations :

1. Object Representation
2. Array Representation

1.Array Representation :

var language = [ "english", "hindi", "marathi" ];

We have created array of languages. Our Variable name is language.

Accessing Array :

language[0] ====>  english

language[1] ====>  hindi

language[2] ====>  marathi

thus we can have access to json array data using index and [] .

2.Object Representation :

var example = { "flower": "rose" };

In above example we have created key-value pair. we have created object example which contain “flower” as “Key” and “rose” as “Value”

example =======> Name of Variable/Object

flower  =======> Key

 rose =======> Value 

How to access JSON Object :

example["flower"]

Or

example.flower

We can represent more and more complex data structure using these JSON elements.

Example Complex Data Structure :

var author =
{
      "firstName": "Pritesh",
      "lastName" : "Taral",
      "site":
      [
         {
         "title": "c4learn.com",
         "year": "2009"
         },
         {
         "title": "javaprogramming4learn.com",
         "year": "2011"
         }
      ]
};

Accessing Various Elements from JSON Object :

1. Accessing name of author :

author.firstname

2. Accessing Last name of author :

author.lastname

3. Accessing c4learn.com :

author.site[0].title

4. Accessing Year :

author.site[0].year

Must Read External Articles -

1. http://codular.com/json
2. Working on JSON objects in jQuery and MVC
3. JSON with Java Tutorials

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