JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.2.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<textarea name="description" data-maxlength="250"></textarea>

JavaScript

$(document).ready(function(){
    $('[data-maxlength]').each(function(){
        $(this).on('keyup', function(){
            $(this).tooltip({
                selector: 'data-toggle="tooltip"',
                placement: 'bottom',
                trigger: 'manual',
                title: $(this).val().length + ' / ' + $(this).data('maxlength') + ' characters used.'
            })
            .data('placement', 'bottom');
            $(this).tooltip('show');
        });
    });
});