Thinking about reactjs serverside

ServerSide.js

router.get('*', function(request, response) {
  let initialState = { title: 'Universal React' };
  let store = Redux.createStore(reducer, initialState);

  ReactRouter.match({
    routes: require('./routes'),
    location: request.url
  }, function(error, redirectLocation, renderProps) {
    if (!USER_LOGGED_IN) {
      let html = ReactDOMServer.renderToString(
        <LoginView />
      );
      response.send(html);
    } else if (renderProps && USER_LOGGED_IN) { 
      let html = ReactDOMServer.renderToString(
        <Provider store={store}>
          <ReactRouter.RouterContext {...renderProps} />
        </Provider>
      );
      response.send(html);
    } else {
      response.status(404).send('Not Found');
    }
  });

});

To add to what you already have, you could update the Redux store with { isAuthenticated: true } as the initial state so then ReactRouter can decide for itself which route to render.

Then you won't need to call ReactDOMServer.renderToString() twice because the logic is all in one place.

Plus, you could create a <Redirect> or <EnsureLoggedIn> component that redirects an unauthenticated user to /login if trying to access a protected route.

That makes since. Thanks for the feedback Mark!