如何使用Node.js和MEAN堆栈进行身份验证？

I am currently working on a text based game with a small team of developers. The game requires login and we are using the MEAN (MongoDB, Express, Angular, Node) Stack for the application codebase, however i am stuck on authentication, as a rails developer i am used to being able to drop in a gem and use the helpers available.I am currently working on a text based game wit