" });  con.connect(function(err) {     if (err) throw err; });  let selectCustomers = function (query, cb) {     let aladinModel = '';     if (query.date && query.station && query.daysForward) {         con.query(`CALL aladin_surfex.Get_mod_cell_values_meteogram(${query.date},${query.station},${query.daysForward})`, function (err, result, fields) {             if (err) throw err;             console.log(result);             aladinModel = result;             return cb(aladinModel);         });     }     else return cb(aladinModel); };  // Root endpoint app.get("/", (req, res, next) => {  selectCustomers(req.query, function (aladinModel) {         res.json({aladinModel})   