PUT/POST Double Quotes without escaping to external server

Explanation:

I am trying to POST/PUT the following text

{"email":"DD@GMAIL.COM"}

via xhttp.send to an external server. I need to post the double quotes with it, but how do I do that? I read about htmlentities, specialchars et cetera but I still, after an hour or more, can not find the solution. And of course, this would not work (because of the double quotes clash):

xhttp.send("{"email":"DD@GMAIL.COM"}");

This is the script until now:

 <!DOCTYPE html>
<html>
<body>

<h1>The XMLHttpRequest Object</h1>

<button type="button" onclick="loadDoc()">Request data</button>

<p id="demo"></p>

<script>
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("PUT", "http://www.example.com/json", true);
  xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xhttp.setRequestHeader('X-CSRF-Token', "csrf_token");
  xhttp.send("fname=Henry"); //TODO: MAKE SURE THAT EXACTLY     {"email":"DD@GMAIL.COM"}       WILL BE 'POSTED'.
}
</script>

</body>
</html>

Please help me, I can not figure this out.

Solution

You can wrap the string in single quotes

xhttp.send('{"email":"DD@GMAIL.COM"}');

However, it's best to serialize it to a string from an object

xhttp.send(JSON.stringify({ email :"DD@GMAIL.COM"}));

Also you should send the correct content-type header

xhttp.setRequestHeader("Content-Type", "application/json");