JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="taglist">
  <li>apple</li>
  <li>orange</li>
  <li>banana</li>
</ul>

CSS

ul#taglist {
  list-style: none;
}

ul#taglist li {
  display: inline-block;
}

ul#taglist li:not(:last-child):after {
  content: ", ";
}