how do i send a variable( from ajax call to mysql using node.js, so that query can be done using that variable and data send back to ejs file

Question

How do I send a variable from ajax call to mysql using node.js, so that query can be done using that variable and data send back to client

/* javascript code in .ejs file*/

<script type="text/javascript">
    $(document).ready(function(req, res){
        $('#empName').keyup(function(event){
            if (event.keyCode === 13){
                var empname = document.getElementById('empName').value;
                alert(empname);

                $.ajax({
                    url: "/autoFill",
                dataType: "json",
                type: "get",
              data: {empname: empname},
                success:  function(data){              
                    console.log(data);
                }
                }) 
            }
            });
        });

</script>

/* route code in index.js at server */

const autoFill = require('../controller/autocomplete1');
router.get('/autoFill', autoFill.autoFill);

/* mysql code in autocomplete1.js file */

module.exports.autoFill = function(req, res){

  var a = req.body.empname;
  var qa = `select lastName, gender, designation, emailID from empMasterData where firstName = "${a}"`;
      database.query(qa, function (err, results) {              
         if(err) throw err;
         var r = JSON.parse(JSON.stringify(results)); 
         console.log(results); 
         console.log(r);
            }
        )   
     };