title: HTML5 / Javascript - DataURL to Blob & Blob to DataURL
body: <p>I have a DataURL from a canvas that shows my webcam. I turn this dataURL into a blob using Matt's answer from here: <a href="https://stackoverflow.com/questions/6850276/how-to-convert-dataurl-to-file-object-in-javascript">How to convert dataURL to file object in javascript?</a></p>
  
  <p>How do I convert this blob back into the same DataURL? I've spent a day researching this and I'm astouned this isn't documented better, unless I'm blind.</p>
  
  <p>EDIT:
  There is </p>
  
  <pre><code>var urlCreator = window.URL || window.webkitURL; 
  var imageUrl = urlCreator.createObjectURL(blob); 
  </code></pre>
  
  <p>but it only returns a really short URL that seems to point at a local file, but I need to send the webcam data over a network. </p>