React router shows blank page - node.js

Question

I am trying to get started with react-router.
import React from 'react';
import ReactDOM from 'react-dom';
import HelloWorld from './pages/HelloWorld';
import {Router, Route, IndexRoute, hashHistory,browserHistory} from "react-router";
...
const app = document.getElementById('root')
ReactDOM.render(<HelloWorld/>, app);
Here dummy class HelloWorld:
import React, { Component } from 'react';
class HelloWorld extends Component {
render(){
return(<h1> HelloWorld </h1>);
}
}
export default HelloWorld;
Using this setting everything works out fine. However, using routes I end up having a blank page.
ReactDOM.render(
<Router history = {hashHistory}>
<Route path ="/" component={HelloWorld}>
</Route>
</Router>,
app);
Where is the mistake? I searched stackoverflow but no answer seems to be suitable.
Whats really weird for me, is that the following code also results in a blank page:
const Routes = () => (
<Router history = {browserHistory}>
<Route path ="/" render={ () => (<h1> HelloWorld </h1>) } />
</Router>
);
const app = document.getElementById('app')
ReactDOM.render(<Routes/>, app);

Answer 1

You're using using the V4 in a V3 way.
Instead of
import {Router, Route, IndexRoute, hashHistory,browserHistory} from "react-router";
Import dependencies in this way:
import {BrowserRouter as Router, Route} from "react-router";
import createHistory from "history/createBrowserHistory" // browser history moved into a standalone package since v4.

Answer 2

Ok "one" solution is:
import {BrowserRouter as Router, Route, IndexRoute,hashHistory,browserHistory} from "react-router-dom";
...
const Routes = () => (
<Router history = {browserHistory}>
<Route path ='/' component={ Layout } />
</Router>
);
const app = document.getElementById('app')
ReactDOM.render(<Routes/>, app);

Answer 3

99% sure your issue is that your tag has a relative link. Make it absolute.
<!-- do this -->
<script src="/static/bundle.js"></script>
<!-- not -->
<script src="static/bundle.js"></script>
<!-- or -->
<script src="./static/bundle.js"></script