Is there a way to let exceptions bubble up instead of passing to finalhandler

[ericuldall]

I'm trying to do some exception handling in my app built on express and it's being problematic that every time I throw an exception it gets printed to the screen.

Is this configurable?

[dougwilson]

Are you talking about getting printed to your web browser, or to the console you are running Node.js on?

[ericuldall]

it does both. I think you just addressed this question on finalhandler issues. Does that answer stand?

[ericuldall]

basically i'm using process.on('uncaughtException') and my thrown errors aren't getting there.

[dougwilson]

The main two configurations are the following:

// don't print errors on your node console window
app.set('env', 'test')

// don't print errors to your web browser
app.set('env', 'production')

By default Express assumes development mode, which is what causes the stack traces to head to your web browser.

Also by default, Express will dump stack traces to your STDERR handle, which is standard when running the server and redirecting STDERR to an error log (as in node app.js 2> error.log).

I think you just addressed this question on finalhandler issues. Does that answer stand?

Yes, it does :) especially if you want it to be extremely configurable :) Another thing you can do is the following to use finalhandler but turn those two features off:

var express = require('express')
var finalhander = require('finalhandler')
var http = require('http')

var app = express()

// declare things on app

var server = http.createServer(function (req, res) {
  app(req, res, finalhandler(req, res, {
    env: 'production', // no stack traces; option name will be better in 1.0
    onerror: function (err) {
      throw err; // rethrow to your uncaughtException handler, but i _highly_ don't suggest this
    }
  }))
})

server.listen(3000)

[ericuldall]

thanks again @dougwilson