node.js - Catch all uncaughtException for Node js app

Question

I have a question: how do I can handle all uncaught Exception (operations/developer error will take all service down) for my node app. Then I can send an email alert to me whenever catch an error.

Answer 1

You can use process 'uncaughtException' and 'unhandledRejection' events.

Also remember that it is not safe to resume normal operation after 'uncaughtException', because the system becomes corrupted:

The correct use of 'uncaughtException' is to perform synchronous cleanup of allocated resources (e.g. file descriptors, handles, etc) before shutting down the process.

Example:

process
  .on('unhandledRejection', (reason, p) => {
    console.error(reason, 'Unhandled Rejection at Promise', p);
  })
  .on('uncaughtException', err => {
    console.error(err, 'Uncaught Exception thrown');
    process.exit(1);
  });