obj.js

var myObj = { name: "John", age: 31, city: "New York" };
console.log('myObj:',myObj);
var myJSON = JSON.stringify(myObj);
console.log('myJSON:',myJSON);
console.log('name:',myObj.name);
console.log('name:',myObj["name"]);
console.log('age:',myObj.age);
console.log('city:',myObj.city);
console.log("===================================");

myObj.name='prabhu';
console.log('name:',myObj.name);
myObj["city"]='dubai';
console.log('city:',myObj.city);
console.log("===================================");

let name='prabhu';
console.log('name:',name);
console.log('name:{$name}');
console.log(`name:{$name}`);
console.log("===================================");

var empText=
    '{"employees":[      {"firstName":"John", "lastName":"Doe"},       {"firstName":"Anna", "lastName":"Smith"},'+
          '{"firstName":"Peter", "lastName":"Jones"}]    }';
console.log('empText:',empText);
var jo=JSON.parse(empText);
console.log(jo);

var empText2='{"employees":[      {"firstName":"John", "lastName":"Doe"},       {"firstName":"Anna", "lastName":"Smith"},{"firstName":"Peter", "lastName":"Jones"}]    }';
console.log('empText2:',empText2);
var jo=JSON.parse(empText2);
console.log(jo);

var empObj= {"employees":[      {"firstName":"John", "lastName":"Doe"},       {"firstName":"Anna", "lastName":"Smith"},{"firstName":"Peter", "lastName":"Jones"}]    };
console.log('empObj:',empObj);

console.log("===================================");

var myJSON = '{"name":"John", "age":31, "city":"New York"}';
console.log('myJSON:',myJSON);
var myObj = JSON.parse(myJSON);
console.log('myObj:',myObj);
var myJSON2 = JSON.stringify(myObj);
console.log('myJSON2:',myJSON2);

var text = '{ "name":"John", "birth":"1986-12-14", "city":"New York"}';
var jo=JSON.parse(text);
console.log('jo:',jo);
jo.birth=new Date(jo.birth);
console.log('jo:',jo);

var jo2=JSON.parse(text,function(key,value){
    if(key=="birth"){
        return(new Date(value));
    }
    else{
        return value;
    }
});
console.log('jo2:',jo2);

for(x in jo2){
    console.log('x:',x);
    console.log('x.name:',x.name);
    console.log('x.name:',jo2[x]);
}
console.log("===================================");

myObj = {
  "name":"John",
  "age":30,
  "cars": {
    "car1":"Ford",
    "car2":"BMW",
    "car3":"Fiat"
  }
 }
console.log(myObj.cars.car1);
console.log(myObj.cars["car2"]);
myObj.cars.car1="Audi";
myObj.cars["car2"]="Mercedes";
console.log(myObj.cars.car1);
console.log(myObj.cars["car2"]);

delete myObj.cars.car2;
console.log(myObj);
console.log("===================================");

 var myobj={
"name":"John",
"age":30,
"cars":[ "Ford", "BMW", "Fiat" ]
};
console.log(myobj.cars[0]);
 console.log('----------');

for(x in myobj.cars){
    console.log(x);
    console.log(myobj.cars[x]);
}
 console.log('----------');

for(i=0;i<myobj.cars.length;i++){
    console.log(myobj.cars[i]);
}
console.log("===================================");

myObj = {
  "name":"John",
  "age":30,
  "cars": [
    { "name":"Ford", "models":[ "Fiesta", "Focus", "Mustang" ] },
    { "name":"BMW", "models":[ "320", "X3", "X5" ] },
    { "name":"Fiat", "models":[ "500", "Panda" ] }
  ]
 };

 for(i in myObj.cars){
     console.log(myObj.cars[i].name);
     for(j in myObj.cars[i].models){
        console.log(myObj.cars[i].models[j]);
     }
 };
 myObj.cars[1].name="Ford-new";
 delete myObj.cars[2].models;
 console.log("===================================");

 for(i in myObj.cars){
     console.log(myObj.cars[i].name);
     for(j in myObj.cars[i].models){
        console.log(myObj.cars[i].models[j]);
     }
 };
 console.log(myObj);
 console.log("===================================");