JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://jquery.bassistance.de/validate/jquery.validate.js"></script>
<link rel="stylesheet" href="http://jquery.bassistance.de/validate/demo/site-demos.css">
<form id="myform">
<label for="field">Username: </label>
<input class="left" id="username" name="username">
<br/>
    <label for="field">Email: </label>
<input class="left" id="email" name="email">
<br/>
    <input type="submit" value="Validate!"/>
</form>

JavaScript

// just for the demos, avoids form submit
jQuery.validator.setDefaults({
  debug: true,
  success: "valid"
});
$( "#myform" ).validate({
  rules: {
    username: {
      required: true
    },
      email : {
          required: true,
          email : true
      }
  }
});