title: Implement this kind of app
body: <p>How do I create a node script, that does something like this:
  (Basically, I just want a flow on how to go about this, like where to use sync, async and callbacks).</p>
  
  <pre><code>[On start / Run once]
  - Check If file (local copy json) exists
  |---Yes - Load from file
  |---No  - Get new data and store in file
  
  - Every 5 minutes, run
  |---Get new data (json)
  |---Check if new item
  |------Yes - Trigger alert
  |------No  - Don't do anything
  </code></pre>