title: Do I have to use express in Next.js project?
body: <p>I’m making a website via <code>Next.js</code>.
  <code>Next.js</code> provides <code>SSR</code> and <code>dynamic routing</code>.</p>
  <ul>
  <li>Do I have to use <code>express</code>?</li>
  <li>If so, why do I have to use it?</li>
  <li>What kind of features of <code>express</code> are useful that are not provided from <code>Next.js</code>?</li>
  </ul>
  <p>I think <code>next build</code> &amp; <code>next start</code> show pages as well as I expected.</p>