JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<form>
<textarea name="text"></textarea>
<p>0</p>
<button type="submit">SEND</button>
</form>
</body>

JavaScript

$("textarea").keyup(function() {
  var len = $("textarea").val().length;
	$("p").text(len);
});

$("form").on("submit", function(e) {
  e.preventDefault();
  var ser = $("form").serialize();
  $("p").text(ser);
});