title: when should I use cookie-parser with express-session?
body: <p>In most ExpressJs example, I found using <code>cookie-parser</code> with <code>express-session</code>. </p>
  
  <p>If I could access session data with <code>req.session.name</code> without it, in what case ( or benefits ) should I be using <code>cookie-parser</code>?</p>