Trouble in fetching firebase data

I see, well the probelm is, the data you get when you fetch the bill details will be a json object. So the attribute names will be those unique child ids, which is a bit messy.

So lets say in this case it would be

this.currentBill['-KnHNPuRsIUSGbxN0jcz'];

So you would have to loop trough the JSON object and get all the data that has those unique IDs.