//create object
var myObj = {
"artist" : artist, //your artist variable
"song_name" : title //your title variable
};
//push the object to your array
favorites.push( myObj );// base code ----------------------------------------------------------
object["property"] = value;
// or
object.property = value;
// exampel : ----------------------------------------------------------
var myJson = { name: "mamad", family: "mirzaei" }
// i wana to add age
myJson.age = 26
// log =>
console.log( "myJson >>:" ,myJson)
// resalt =>
{ name: "Mamad", family: "Mirzaei", age : 26 }
var jsonStr = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';
var obj = JSON.parse(jsonStr);
obj['theTeam'].push({"teamId":"4","status":"pending"});
jsonStr = JSON.stringify(obj);
// "{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"
object.property = value;