Question

Let’s say my node.js app is running. If there is an error (I mean ALL errors. Not just the web error. If it goes to Err out, it counts) , how can I call a function to send an email to me?

Basically, before I want it to write to err.out, I want an email sent to me.

I’m using node.js and express.

Edit: I know how to send an email. The question I want to know is how to intercept the error.
You know how when there’s an error, it logs to out.log? Well, right now, I’m tail -f out.log, monitoring for errors. I can’t sit at home all day doing this. I want errors emailed to me anytime it pops up in out.log.

I want all errors emailed to me. (Not just Express errors). If it’s logged, I want that error emailed.

Answer 1

You could replace nodes global console.error() function with one implementation sending emails:

console.error = function(msg) {
  // send email
  // ...

  // additionaly log
  process.stderr.write(msg);
};

Then every call in every library made to console.error() would call your specific implementation send out mails 😉