&gt; There&#x27;s no valid reason why most people should choose JS on the server instead of Ruby, Python, PHP, C# or Java<p>It&#x27;s faster than the first 3 of those and easier to write than the last 2. It handles concurrency better than the first 3 as well.<p>I&#x27;ll be sure to let Ebay, Paypal, Yahoo, Walmart, AirBnB, Netflix, Uber.. etc that they are clearly wrong: because you said so.