JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="watched_textarea" rows="10" cols="45">assdsddsds

ssdsa</textarea>
<div id="output_div"></div>

JavaScript

$( "#watched_textarea" ).keyup( function() {
       $( "#output_div" ).html( $( this ).val().replace(/\n/g, '<br />') );
    });