Javascript Get Key from data (not showing key)

I have some data which looks like this:

var mydata =[{
    "493":{
        "name":"Name 1",
        "subhere":{
            "subhere1":2
        }
    },
    "673":{
        "name":"Name 2",
        "subhere":{
            "subhere1":20
        }
    }
}];

I want to get the keys value into a variable so I’ve done this:

var data = [];
for (var i = 0; i < mydata.length; i++) {       
    var obj = mydata[i];     
    for(var key in obj){
        var newObj = {      
            name: obj[key].name,
            y: obj[key].subhere.subhere1,
            id: i,
            test: obj[key]   
        };
        data.push(newObj);      
    }
}

If you look at the line that has test: obj[key] that’s the line I want to get the value of the key BUT when I console.log(this.test) I get Object { name="Name 1",…etc but it’s not giving me the 493 or 673

How can I get the key number?