Java-script Object Notation (JSON)

Java-Script Object Notation : Introduction 

Let us discuss about JSON Concept with Android Training in Chandigarh. JSON is "a lightweight data-interchange format". JSON is syntax for accumulating and transferring text information. Rather than attempt to chain references as comma-delimited strings, or have to deal with the complexity (and overhead) of XML , JSON is smaller than XML, and faster and easier to parse. JSON provides a format that converts a server-side structure into a JavaScript object that one can use practically right out of the box.

JSON Syntax :

JSON syntax is a subset of Java-script syntax. JSON data is written as name/value pairs.

A name/value pair consist of a field name (in double quotes), followed by a colon, and followed by a value :

"firstname" : "John"

For Example,
 {
"employees";
[
{"firstname": "Arjun", "lastname" : "Singh"},
{"firstname" : "Sanjay", "lastname" : Verma"},
{"firstname" : "Peter", "lastname" : Sharma"}
]
}
The employees object is an array of 3 employees records (objects).

JSON Syntax Rules :

1. Data is in name/value pairs.
2. Data is separated by commas.
3. Curly braces hold objects.
4. Square brackets hold arrays.

Array : 

Array elements are generally of a basic type (number,string, Boolean or null), however can also be a nested array or object. Elements are comma- delimited and contained with in brackets.

Array with Objects:
Each of it contain multiple comma-delimited key/value pairs. Objects with an array can be accessed using the array name and index. This array having comma- delimited objects

Object :

This object contains multiple comma-delimited key/ value pairs. Object properties can be accessed using the object name followed by a period and property name - or - can be accessed like an array using the property name in quotes ( in place of an index ).


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