React Js Get protocol, domain, and port from URL

<!DOCTYPE html>
<html lang="en">

<body>
  <div id="app"></div>
  <script type="text/babel">
    function App() {
      const url = new URL('http://127.0.0.1:5500/example/react.html');
      const port = url.port;

return (
        <div className='container'>
          <h3>React Js Get Port Number</h3>
          <p>Get Port Number: {port}</p>
        </div>
      );
    }
    ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    * {
      box-sizing: border-box;
    }

.container {
      margin: 0 auto;
      width: 600px;
      text-align: center;
      background: #fff;
      border-radius: 5px;
      padding: 20px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }
  </style>
</body>

</html>