JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id='text'></textarea>
<p>
    Words amount: <div id='textInfo'></div>
</p>

JavaScript

var textArea = $('#text');
var textAreaInfo = $('#textInfo');

function countWords(){
    textAreaInfo.html(textArea.val().split(/\S+/g).length-1);
}

textArea.keyup(function(){
   countWords();
});