convert data into json format in javascript

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

Use the JavaScript function JSON.parse() to convert text into a JavaScript object:
var obj = JSON.parse('{ "name":"John", "age":30, "city":"New York"}');

Use the JavaScript function JSON.parse() to convert text into a JavaScript object:

var obj = JSON.parse('{ "name":"John", "age":30, "city":"New York"}');