React Base Fiddle (JSX)

Starting point for creating JSFiddles with React.

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-router-dom/4.2.2/react-router-dom.js"></script>
<div id="container">
  <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

const BrowserRouter= ReactRouterDOM.BrowserRouter;
const  Switch= ReactRouterDOM.Switch;
const  Route = ReactRouterDOM.Route;


ReactDOM.render(
  <BrowserRouter>
     <Route path='/'>
       <Switch>
        <Route path='/' render={() => <h1>hello</h1>}/>
        <Route render={() => <h1>not found</h1>}/>
       </Switch>
     </Route>
  </BrowserRouter>,
  document.getElementById('container')
);