Here from your twitter. Well written article and I hope it would be helpful for beginners who are on their way to figuring out express.
Also, I suppose you can write a entire dedicated article relating to JWT authentication in express. That way it could be more clear.
PS: I too have started writing blogs and have published an article. If you don't mind please feel free to read this one :- How I fixed java.io.IOException: Broken Pipe in Java (Wildfly 10.1)