What is serialization ?
Serialization is a process of translating an object into a format, that can be stored in a file or memory and restructured later in the same or another environment. There are different types of serializations like JSON, XML etc..

Example :
 class Person
  {
   string name;
   int age;
   string address;
 }

suppose there are 3 objects of class person .. p1, p2 and p3
now serialize these object into Json

{
"p1":{
        "name":"Rabi",
        "age":"23",
        "address":"Kolkata"
     }  ,

"p2":{
        "name":"Suman",
        "age" : "26",
        "address" : "Delhi"
     }  ,

"p3":{
        "name":"kumar",
        "age": "30",
        "address" : "Mumbai"
     }
}

Create Json using javascript

var Person=function(){
   this.name="";
   this.age;
   this.address="";
}

var p1=new Person();
p1.name="Rabi";
p1.age=23;
p1.address="Kolkata";



var p2=new Person();
p2.name="Suman";
p2.age=26;
p2.address="Delhi";


var p3=new Person();
p3.name="Kumar";
p3.age=30;
p3.address="Mumbai";

var personMap={};
personMap ["p1"] = p1 ;   personMap ["p2"] = p2 ;   personMap ["p3"] = p3 ;

alert(   JSON.stringify (personMap)   ); // convert the personMap object into string