CODE EXAMPLE FOR JAVASCRIPT

react-device-detect

import {isMobile} from 'react-device-detect';

function App() {
  renderContent = () => {
    if (isMobile) {
      return <div> This content is available only on mobile</div>
    }
    return <div> ...content </div>
  }

  render() {
    return this.renderContent();
  }
}