Keeping errors from appearing to the user in node.js

How would I keep uncaught errors from being sent to the users when I use express.js in node.js?

Let's say that I have the following route set up:

app.get "/err", (req, res) ->
  throw new Error "Something went wrong"
  res.send "Hello World", 200

And to handle my exceptions:

process.on "uncaughtException", (err) ->
  console.log "OH NOES: UNCAUGHT EXCEPTION"
  console.log err.message, err.stack
  process.exit(1) #Exit with error

Still, when I visit the /err in my browser, Error: Something went wrong is shown along with a stack trace of the error. The same thing occurs if I put all my routes inside a try/catch-block.

How do I prevent this?