title: express.js - req.body?
body: <p>I'm new to js, 
  I see this a lot in the code I'm reading</p>
  
  <pre><code>_.pick(req.body, ' ' , ' ') 
  </code></pre>
  
  <p>What does req.body do? 
  And when can I say req.body.something?</p>