Is it possible to catch exceptions thrown in a JavaScript async callback?

Question

Is there a way to catch exceptions in JavaScript callbacks? Is it even possible?

Uncaught Error: Invalid value for property 

Answer 1

Yes, you can override the default behaviour of window.onerror:

window.onerror = function(message, file, lineNumber) {
  // all errors will be caught here
  // you can use `message` to make sure it's the error you're looking for
  // returning true overrides the default window behaviour
  return true; 
};