So now the problem I am facing is that, what about if I want to alert
success. Is there a need way to get it ?
If your object is
var obj = {"success":"You are welcome"};
You can get the array of keys as
var keys = Object.keys(obj);
and then print it as
console.log( keys[ 0 ] ); //or console.log( keys.join(",") )
var obj = {"success":"You are welcome"};
var keys = Object.keys(obj);
console.log(keys[0]);