JSON

JSON

JSON is a lightweight data-interchange format.
JSON :- JavaScript Object Notation

Sending Data

var myObj = { "name":"John", "age":31, "city":"New York" };
var myJSON = JSON.stringify(myObj);
window.location = "demo_json.php?x=" + myJSON;

Receiving Data

var myJSON = '{ "name":"John", "age":31, "city":"New York" }';
var myObj = JSON.parse(myJSON);
document.getElementById("demo").innerHTML = myObj.name;

JSON Syntax Rules

• Data is in name/value pairs
• Data is separated by commas
• Curly braces hold objects
• Square brackets hold arrays

Eg: 
JSON Strings
{ "name":"Dilani" }

 JSON Numbers
{ "age":19}  

 JSON Objects
{
"employee":{ "name":"Dilani", "age":19, "city":"Jaffna" }
}  

 Arrays
{
"employees":[ "Dilani", "Api", "Mino" ]
} 

 JSON Booleans

{ "sale":true } 

 

JSON null

{ "middlename":null }

Data Types

• a string
• a number
• an object (JSON object)
• an array
• a boolean
• null

JSON values cannot be one of the following data types:

• a function
• a date
• undefined

Stringify

var myJSON = JSON.stringify(arr);