JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <input type="text" class="inputs" id="first" value="hello">
    <input type="text" class="inputs" id="second" value="John">
</div>

JavaScript

$('.inputs').on('keyup',function(){
    $(this).parent().not(this).find('.inputs').val($(this).val());
}
);