Express server middleware function not handling exceptions

[nealalpert]

We implemented some custom error handling on our express server with an error handling middleware function. The idea was to handle exceptions and send error messages and stack traces to a log so we could correct them in a timely fashion.

const express = require('express');
const next = require('next');
const Rollbar = require('rollbar');
const config = require('./env/config');

const rollbar = new Rollbar({
  accessToken: config.SERVER_ERROR_REPORTING_TOKEN,
  handleUncaughtExceptions: true,
  handleUnhandledRejections: true,
  payload: {
    environment: config.APP_ENV,
  },
});
const dev = process.env.MODE !== 'production';
const app = next({ dev });
const handle = app.getRequestHandler();

app.prepare()
.then(() => {
  const server = express();

  server.get('*', (req, res) => handle(req, res));

  server.use(rollbar.errorHandler());

  server.listen(3000, (err) => {
    if (err) throw err;
    console.log('> Ready on http://localhost: 3000');
  });
});

Problem is the error event emissions seem to be getting captured before express gets ahold of them.

Any idea what might be doing this?

[ethanresnick]

See #1852. I want this as well!

[arunoda]

Thanks @ethanresnick for the reference.
Closing this one in favor of the reference.