title: Why everyone uses MongoDB for user authentication with Node.Js and Express
body: <p>Almost every example I find for local authentication strategy combining Node.Js / Express.Js and Passport (or other popular modules) uses MongoDB.</p>
  
  <p>I was wondering if anybody could answer me what are the advantages of this combination and if there are any  other, lighter databases to use. For example, any example of anyone using Redis for this sort of thing? Or why not just use MySQL for user management?</p>