javascript - Returning value from async function in NodeJS -

i'm trying query data in json serverside code running on node.js

here clientside ajax request:

$(function() {   var values = $(this).serialize();   $.ajax({     url: '/querysearch',     type: 'post',     data: values,     success: function(msg){       console.log(msg);     },     error: function(){       alert('failure');     }   }); }); 

my serserside code:

app.post('/querysearch', function(req, res) {   var querynumber = number(req.body.querynumber);   if (querynumber == 1){     executequery1(res, sendqueryresults);   }   else if (querynumber == 4){     executequery4(res, sendqueryresults);   }   else if (querynumber == 6){     executequery6(res, sendqueryresults);   }   else if (querynumber == 7){     executequery7(res, sendqueryresults);   } });  function executequery1(res, callback) {     var query = "" +     'query string';     service.oneshotsearch(query, {}, function(err, results) {       if (err) {         console.log(err);         alert("an error occurred search");         return;       }     callback(res, results);     });   });  }   function sendqueryresults(res, results) {   res.json(json.stringify(results));   res.end(); } 

however, @ moment, webpage won't finish loading. doing wrong?

you need call res.end() after have written data in.