title: Express.js server not responding - how to debug?
body: <p>I have a express.js API that i recently had to tweak for some frankly dumb changes that affected core elements of it.</p>
  
  <p>Now I have the problem that sometimes my server doesn't respond and after changing ~ 15 API paths i can no longer backtrack and redo it without losing way too much time. I suspect the server somehow is stuck in a endless loop and is just busy looping trough infinity and not responding to anything else.</p>
  
  <p>Is there any good way to debug this kind of bug? Can i e.g. log the line-number i am running every second?</p>