JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js"></script>
<form action="/account/register" method="post" id="form-register">
  <div class="input-row">
    <input name="data[User][password]" type="password" id="FUserPassword"
    class="required" placeholder="Password">
  </div>
      <input type="submit" />
</form>

JavaScript

$(document).ready(function () {
  $("#form-register").validate({
    rules: {
      'data[User][password]': {
        minlength: 8
      }
    }
  });
});