title: How to invoke external scripts/programs from node.js
body: <p>I have a <code>C++</code> program and a <code>Python</code> script that I want to incorporate into my <code>node.js</code> web app. </p>
  
  <p>I want to use them to parse the files that are uploaded to my site; it may take a few seconds to process, so I would avoid to block the app as well. </p>
  
  <p>How can I just accept the file then just run the <code>C++</code> program and script in a sub-process from a <code>node.js</code> controller?</p>