Post request data to json in node

im sending a simple ajax-jqurey post request :

$('#postButton').click (function () {
        var empInfo = $('#empForm').serialize();
        var empData = JSON.stringify(empInfo,null,2);

    $.ajax({
          type: 'POST',
          dataType: 'JSON',
          url: 'http://localhost:3000/post',
           data: empData, // check how to stringfy to json and send() .
          success: function(serverData){
              $('.thankU').html(serverData);
          }
        });

i have tried every way i know to get the data into json format on the node server :

app.post('/post', function(req, res){

    // get query params as object
            req.on('data', function(chunk) {
      console.log("Received body data:");
      console.log(chunk.toString());
      console.log(JSON.parse(chunk) );
      console.log(qs.parse(chunk) );
      console.log(JSON.stringify(chunk));
    });

});

and the result is :

Received body data:
"bname=jjj&burl=jfjfj.com&bEmail=ff&bPhone=0608584884&fieldSelected=webPro"
bname=jjj&burl=jfjfj.com&bEmail=ff&bPhone=0608584884&fieldSelected=webPro

instead of thw way it appers in developer tools\network : "bname:jjj burl:jfjfj.com bEmail:ff bPhone:0608584884 fieldSelected:webPro"