JSFiddle - React, Tailwind, and code Playground
HTML
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.min.js"></script>
<select class="js-example-basic-multiple" name="states[]" multiple="multiple">
<option value="AL">Alabama</option>
...
<option value="WY">Wyoming</option>
</select>
JavaScript
$('.js-example-basic-multiple').select2({tags: true,
tokenSeparators: [',', ' ']});