How to use Underscore templates instead of Jade in Express?

I don't want to use the Jade templating engine that comes by default with Express. I tried to follow this guide but it fails: http://blog.luksidadi.com/expressjs-underscore-template/ The error in question is: ``` node.js:201 throw e; // process.nextTick error, or 'error' event on first tick ^ Error: callback function required at Function.engine (/home/me/blog/node_modules/express/lib/application.js:173:38) at Object.<anonymous> (/home/tk/blog/app.js:28:5) at Module._compile (module.js:432:26) at Object..js (module.js:450:10) at Module.load (module.js:351:31) at Function._load (module.js:310:12) at Array.0 (module.js:470:10) at EventEmitter._tickCallback (node.js:192:40) ``` I get this when I try to start the server with: ``` node app.js ``` How to solve this? app.js: ``` /** * Module dependencies. */ var express = require('express') , routes = require('./routes') , user = require('./routes/user') , http = require('http') , path = require('path'); var app = express(); app.configure(function(){ app.set('port', process.env.PORT || 3000); app.set('views', __dirname + '/views'); //app.set('view engine', 'jade'); app.use(express.favicon()); app.use(express.logger('dev')); app.use(express.bodyParser()); app.use(express.methodOverride()); app.use(app.router); app.use(express.static(path.join(__dirname, 'public'))); }); // Add these lines to register underscore template var _ = require('underscore'); app.engine('.html', { compile: function(str, options){ var compiled = require('underscore').template(str); return function(locals) { return compiled(locals); }; } }); app.configure('development', function(){ app.use(express.errorHandler()); }); app.get('/', routes.index); app.get('/users', user.list); http.createServer(app).listen(app.get('port'), function(){ console.log("Express server listening on port " + app.get('port')); }); ``` routes/index.js: ``` /* * GET home page. */ exports.index = function(req, res){ res.render('index.html', { title: 'Express' }); }; ``` layout.html: ``` < html > < head > < title ><%=title%>< /title > < /head > < body > <%=body%> < /body > < /html > ``` index.html: ``` Hello world ```