// Replace variable names or objects inside the array does not replace the value // define a variable var jsonObj; // variables which we desired object or array jsonObj = {code: "200" , name: "300", sex : "400" }; // this is the code attributes directly into Supercode // the JSON.parse () is used to convert a JSON string object // the JSON.stringify () is converted into a string json jsonObj = JSON .parse (JSON.stringify (jsonObj) .replace ( 'code', 'superCode'))