title: Setting Up HTTPS in Express JS
body: <p>I bought an AlphaSSL from a hosting provider. They just gave me</p>
  
  <ul>
  <li>domain.csr.crt</li>
  <li>domain.interCert.crt</li>
  <li>domain.PKCS7Cert.crt</li>
  <li>domain.rootCert.crt</li>
  <li>domain.X509Cert.crt</li>
  </ul>
  
  <p>But as I know that to run HTTPS on Node.JS using Express, I need at least key file and cert file. Then, what kind of file I should use? Thank you.</p>