JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/js-cookie/2.1.0/js.cookie.js"></script>
<input type="text" placeholder="email address" id="email_address">
<button type="submit" id="test_button">Test
</button>

JavaScript

var cookie_email = Cookies.get('user_email');
$('#email_address').val(cookie_email);

$('#test_button').click(function() {
    Cookies.set('user_email', $('#email_address').val(), {
        expires: 365
    });
});