title: How to automate javascript web app even when website/browser isn't open
body: <p>I'm working on a javascript based web application. I have a webpage which has nothing but a button. When I click this button, it pulls data from another website and stores it in my Mongo database. </p>
  
  <p>I need to automate this button click. That is, even without opening the website and clicking the button, the 'pulling data from another website and storing it in my database' should happen. </p>
  
  <p>I literally do nothing but click a single button. So I believe this can be made automated and run automatically without human intervention at regular interval. (example: I need this process done everyday at 6 PM). Is this possible at all? </p>
  
  <p>P.S: I've heard of Selenium but it isn't clear whether selenium would do this. Even if that's the case, I can't seem to use the tool. I was able to download a '.jar' file but it doesn't even open. </p>
  
  <p>Appreciate any help!</p>