Express 3 error middleware not being called

Question

I am trying to setup error handling for my express app and running into the following problem.

I defined an error middleware and add it as the last middleware:

Answer 1

Updated answer for Express 4 users from the Express 4 docs. See example from docs below. Note that app.router is deprecated and no longer used. I also added a dummy route to make the ordering clear:

"You define error-handling middleware last, after other app.use() and routes calls; For example:

var bodyParser = require('body-parser');

app.use(bodyParser());
app.get('/', function(req, res) {
    res.send('hello world');
})
app.use(function(err, req, res, next) {
  // logic
});

"