title: How to create an image on the fly with Node.js?
body: <p>I'm using Node.js and Express web framework, I need to create an on-the-fly image <strong>.png</strong> or <strong>.jpg</strong> (like captcha), then I have to send that image to the browser.</p>
  
  <p>What is the simplest way to do that?
  In the image I should write letters/numbers (max 5).</p>
  
  <p>P.S. I don't know what library to use that connects to an online service as the recaptcha module does.</p>