Question

I create JSON object as:

var myJsonObject = JSON.stringify(objectString)

How I can add another item into myJsonObject??

Answer 1

myJsonObject is now a string you cannot add anything to it again until you change it back into a JSON object.

So you can technically do:

var myJsonObject = JSON.parse(myJsonObject); //change to obj
myJsonObject.somethingnew = true; //add something
myJsonObject = JSON.stringify(myJsonObject); //change back to string