JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="ci" name="ci"/>
<br><br><br>
<input type="text" id="pass" name="pass"/>

JavaScript

$(document).ready(function () {
    $("#ci").keyup(function () {
        var value = $(this).val();
        $("#pass").val(value);
    });
});