JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" id="i1">
<input type="text" id="i2">
JavaScript
jQuery(document).ready(function($) {
var $i1 = $('#i1');
var $i2 = $('#i1');
$i1.on('input', function() {
$('#i2').val($('#i1').val());
})
});