title: What properties does Node.js express's Error object expose?
body: <p>I would like to know what are the functions the Error object of nodejs express exposes for use in Error Handling? <br /><br />
  A <code>console.log</code> of an error call <code>new Error('NotFound')</code> is showing only <code>[Error: NotFound]</code>, is this because <code>.toString()</code> method is overriden? How do find the properties and functions exposed by these objects?</p>