I would like to share two Ruby libraries I made in order to implement some security tips in JWT token authentication. One of them is warden-jwt_auth, which can be used in any Rack application that uses Warden as authentication library. The other one is devise-jwt, which is just a thin layer on top of the first that automatically configures for devise and, subsequently, for Ruby on Rails.

http://waiting-for-dev.github.io/blog/2017/01/26/a_secure_jwt_authentication_implementation_for_rack_and_rails/