1var person={"first_name":"Tony","last_name":"Hawk","age":31};
2var personJSONString=JSON.stringify(person); 

1var jsonPerson = '{"first_name":"billy", "age":23}';
2var personObject = JSON.parse(jsonPerson); //parse json string into JS object

1
2
3  var obj = { name: "John", age: 30, city: "New York" };
4var myJSON = 
5  JSON.stringify(obj);
6document.getElementById("demo").innerHTML = myJSON; 

1var obj = JSON.parse("{no:'u',my:'sql'}");//returnes {no:'u',my:'sql'}