Json

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JSON

Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

Contents
 WHAT IS JSON?
 JSON ADVANTAGES
 JSON STRUCTURE
 SYNTAX OF JSON
 JSON OR XML?

JSON
JavaScript Object Notation
 Lightweight data-sharing format.
 Derived from the JavaScript.
 Language independent.
 An alternative to XML

JSON
advantages
easy for humans to read and write
JSON's structure is simple.
Better Parsing efficiency.


JSON
Structure
JSON is built on two structures:
 A collection of name/value pairs.
realized as objects.
 An ordered list of values.
realized as array.

JSON Objects
{ "firstName":"John" , "lastName":"Doe" }
This is also simple to understand, and equals to the JavaScript
statements:
firstName = "John";
lastName = "Doe";

JSON Arrays
JSON arrays are written inside square brackets.
An array can contain multiple objects:
{
"employees": [
{ "firstName":"John" , "lastName":"Doe" },
{ "firstName":"Anna" , "lastName":"Smith" },
{ "firstName":"Peter" , "lastName":"Jones" }
]
}

sample program
<!DOCTYPE html>
<html>
<body>
<h2>JSON Object Creation in JavaScript</h2>
<p>
Name: <span id="jname"></span><br>
Age: <span id="jage"></span><br>
street: <span id="jstreet"></span><br>
Phone: <span id="jphone"></span><br>
</p>
<script>
var JSONObject = {
"name":"Baabtra",
"street":"calicut",
"age":33,
"phone":"555 1234567"};
document.getElementById("jname").innerHTML=JSONObject.name;
document.getElementById("jage").innerHTML=JSONObject.age;
document.getElementById("jstreet").innerHTML=JSONObject.street;
document.getElementById("jphone").innerHTML=JSONObject.phone;
</script>
</body>
</html> clIck me

JSON ➡ Native data form for
JavaScript
JSON XML
Data is readily accessible
as JSON objects
XML data needs parsing
Retrieving values from JSON is as easy
as importing an object in
JavaScript
Needs to use tedious DOM APIs and
processing power to assign to variables.

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