JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.js"></script>
<div id="mydiv">12345678911131517192123</div>

JavaScript

var div = $('#mydiv');
var text = div.text();

div.text(div.text().substring(0,15));