react routing and django url conflict

The issue is probably that you haven't configured your URLs to handle the routes that are defined in React Router. In your Django urls.py you should be using a catch all to match all URLs to your index template

urlpatterns += [
    # match the root
    url(r'^$', base_view),
    # match all other pages
    url(r'^(?:.*)/?$', base_view),
]

The base_view would be a view function that renders a template which includes your bundled app.

In case anyone has this same problem, in django 2.0, follow 'Kevin Martin Jose' answer but instead, replace url with re_path

from django.urls import path, re_path

urlpatterns = [
    path('login/', LoginView.as_view(), name='login'),
    path('logout/', LogoutView.as_view()),
    path('/', login_required(TemplateView.as_view(template_name="app.html"), 
    login_url='login')),
    re_path(r'^(?:.*)/?$', login_required(TemplateView.as_view(template_name="app.html"), 
    login_url='login')),
]