title: How to validate and handle a form in Express (NodeJS)
body: <p>Is there a preferred form handling and validation library for Express?</p>
  
  <p>I'm really looking for a similar level of abstraction as is found in Django forms - i.e. validation and error reporting in the template.</p>
  
  <p>If the same validation could be used on the client side, that would be great.</p>
  
  <p>Has anyone used, or written, anything good?</p>