JSFiddle - React, Tailwind, and code Playground

HTML

<form>
<textarea id="tpName" name="tpName" onchange="tpName(this)" style="margin-top: -9px; width: 275px; height: 40px;"></textarea>
</form>

<textarea id="copytpName" name="copytpName" style="margin-top: -9px; width: 275px; height: 40px;"></textarea>

JavaScript

$("#tpName").keyup(function(){
    console.log("adaad");
   $("#copytpName").val($(this).val());
})