Create 404 Page for in React

gistfile1.txt

In App.js
First add import
import { BrowserRouter as Router, Switch, Route } from "react-router-dom";
Then,
in Class in render() method in Routes,
render() {
  return (
    <Router>
      <Switch>
       <Route exact path='/'><Home /></Route> //Home Page maybe
       <Route ><Error /></Route> //Error is the 404 Page Component.
      </Switch>
    </Router>
   );
  }


Now for every /anything/not/valid/url it will show Error Page.