app.use(function(err, req, res, next) {
 console.error(err.stack);
 res.status(500).send('Something broke!');
});

process.on('uncaughtException', function(err) {
 console.log('Caught exception: ' + err);
});

const Layer = require('express/lib/router/layer');
Object.defineProperty(Layer.prototype, 'handle', {
  enumerable: true,
  get() {
    return this.__handle;
  },
  set(fn) {
    if (fn.length === 4) {
      this.__handle = fn;
    } else {
      this.__handle = (req, res, next) =>
        Promise.resolve()
          .then(() => fn(req, res, next))
          .catch(next);
    }
  },
});

npm install express-async-errors --save

var express = require('express');
require('express-async-errors');