app.js which can be opened and viewed local in the browser.
But opening a file via the ´file://´ -scheme causes some problems due to security policies.
The simplest solution for me is to use a HTTP server built with node.js which serves my local files on localhost:8080.
The installation is kinda simple via NPM:
$ [sudo] npm install -g http-server
If the installations succeeds, you can go into the directory you want to serve and simple enter
http-server which will immediatly start the server.