Can't get errorhandler to work in Express 4

[rawaludin]

I'm new in this. I have this code:

    var express = require('express')
    var responseTime = require('response-time')
    var errorhandler = require('errorhandler')
    var app = express()

    // view engine
    app.set('view engine', 'jade')

    // middleware
    app.use(express.static('public'))
    app.use(responseTime())
    app.use(errorhandler({log: false}))

    app.get('/', function (req, res) {
      // res.render('index')
      fails()
    })

    app.listen(3000)

When I hit / I thought I should get the errorhandler in styled html, but it just shown like this:

What should I do to show the errorhandler html on the response??

[jordonias]

Your error handler should be after the routes. Also fails() is not defined, I think you're looking to use next() but it should be one of the arguments like function(req, res, next).

var express = require('express');
var errorHandler = require('errorhandler');

var app = express();

app.get('/', function(req, res, next) {
  return next(new Error('some error'));
});

app.use(errorHandler());

app.listen(3000);

It will also work if an error is thrown like:

var express = require('express');
var errorHandler = require('errorhandler');

var app = express();

app.get('/', function(req, res, next) {
  throw new Error('some error');
});

app.use(errorHandler());

app.listen(3000);

You'll want to review some of the api documentation, specifically:
http://expressjs.com/en/guide/using-middleware.html
http://expressjs.com/en/guide/error-handling.html

[Knighton910]

Yeah @rahmatawaludin, like @jordonias said, you always wanna define errors after you're routes.
And @jordonias i think that would be really cool, as discussed on gitter to do a pull request with more error handling examples. 👍

[jordonias]

At a bare minimum there should be a link in README.md to the error-handling guide in the expressjs.com docs.

[Knighton910]

True 💯

Are you gonna make that pull request, or shall I?

[jordonias]

You can start one if you'd like. I won't have time until later.

[Knighton910]

Yea, me as well, i'll have it in the pull request queue tonight.

[dougwilson]

I'm going to close this issue since the question was ultimately answered :)