title: express-jwt vs. jsonwebtoken
body: <p>I have a feeling this is going to be a quick answer, but I can't seem to find any great definitive answers on the web - what is the difference between the jsonwebtoken npm package and the express-jwt npm package? I <em>think</em> express-jwt is written on top of jsonwebtoken and simply verifies incoming tokens and sets <code>req.user</code> to the user payload on the JWT.</p>
  
  <p>Is that correct? Sorry if this is a total noob question... I just started learning authentication and node/express, so it's all pretty new to me.</p>