JSON Web Tokens

I just found out about JSON Web Tokens (JWT) and they look like something I definitely want to use. If you haven’t heard about them, checkout out jwt.io, which has a lot of info on the subject, and looks to be the the product of Auth0.

I’m curious if there is anyone out there using these JSON Web Tokens in the wild. I would love to hear from people who have had success implementing these in their apps.