app.js

app.get("/api?", function(req, res) {
  var url_parts = url.parse(req.url, true);
  var query = url_parts.query;
  if (query.lon === "" || query.lat === "" || query.lon === null) {
    res.sendStatus(404);
  }
  queryStuff = JSON.stringify(req.query);
  console.log(req.query.lon);
  res.end(queryStuff);
});