title: How can I know how many elements does req.body holds?
body: <p>I've been learning <em>express.js</em> and <em>node js</em> recently, and I'm developing a questionnaire form which posts the relevant parameters to the server. I'd like to know if my clients complete all questions. How can I check how many elements are in <code>req.body</code>.</p>
  
  <p>Does <code>req.body</code> has the property <code>.length</code>?</p>
  
  <p>Thanks a lot.</p>