JSFiddle - React, Tailwind, and code Playground

HTML

<div id="a"></div>
<div id="b"></div>
<div id="c"></div>

JavaScript

var data =  JSON.stringify({"hello": "a??b" });       

$("body").bind("ajaxSend", function(elm, xhr, s){
    $("#a").text(data);
    $("#b").text(s.data);
    $("#c").text("Equal: " + (s.data === data));    
});

$.ajax({
  type:"POST", 
  dataType:"json",
  contentType:"application/json",
  data: data,
  url:"/echo/json/"
});