The prop `history` is marked as required in `Router`, but its value is `undefined`. in Router

If you are using react-router v4 you need to install react-router-dom as well. After that, import BrowserRouter from react-router-dom and switch Router for BrowserRouter. It seems that v4 change several things. Also, the react-router documentation is outdated. This is my working code:

import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter, Route } from 'react-router-dom'
import App from './components/App';

ReactDOM.render((
     <BrowserRouter>
          <Route path="/" component={App}/>
     </BrowserRouter>
     ),
     document.getElementById('root')
);

Source

Which version of React Router are you using? Router version 4 changed from passing in the browserHistory class to passing an instance of browserHistory, see the code example in the new docs.

This has been catching lots people who automatically upgrade; a migration document will be out 'any day now'.

You want to add this to the top:

import { createBrowserHistory } from 'history'

const newHistory = createBrowserHistory();

and

<Router history={newHistory}/>

If you want to have multiple routes you can use switch like this,

import {Switch} from 'react-router'; 

then

<BrowserRouter>
     <Switch>
         <Route exact path="/" component={TodoComponent} />
         <Route path="/about" component={About} />
     </Switch>
</BrowserRouter>