Validate authentication_token from Microsoft LiveID with node & express-jwt

Microsoft offers with live.com a service which can be used as identity provider for your application. I lost a couple hours when I tried to validate the issued authentication token from Microsofts IdP with the help of express-jwt in my node application.

This article describes how to solve this in a node application:

http://blog.dirk-eisenberg.de/2014/08/30/validate-authentication_token-from-microsoft-liveid-with-node-express-jwt/