[javascript] How to access nested JSON data

Let say I have json data like

data = {"id":1,
        "name":"abc",
        "address": {"streetName":"cde",
                    "streetId":2
                    }
        }

Now I am getting fields to be accessed from this json data like : fields = ["id", "name", "address.streetName"]

How could I access third field (address.streetName) from given json data in most efficient way? data.fields[2] doesn't work

One possibility is I construct data[address][streetName] string using a for loop and do eval of that but is there any efficient way of doing this?