Ajax cannot retrieve the data nodejs later sent.

  node.js, question

Background
router.get(‘/objCent’,(req,res,next)=>{

res.send(JSON.parse({id:'dddd'}));

})
Front desk
$.ajax({

type: "GET",
 url: "/objCent",
 dataType: "json",
 success: function(data){
 var t= JSON.stringify(data);
 alert(t);
 bracket
 });
 I can't get this data, and the front desk doesn't have a pop-up box. Is Gao Fun writing something wrong?

Send ({id:’ ddddd’}) directly;