Large json

No error, it just stops.

require("http").get("http://forecast.weather.gov/MapClick.php?lat=39.70&lon=-104.80&FcstType=json", function(res) {
  var contents = "";
  res.on('data', function(data) { contents += data; });
  res.on('close', function() { console.log(contents); });
});

After it stops I run process.memory() and it returns...
{ "free": 1349, "usage": 51, "total": 1400, "history": 28 }

Am I reading that correctly and its not used much memory?