app.js

// ... app.js ...
//
// In the below examples replace 'development' (and 'production') with
// the actual NODE_ENV passed, for example we use 'dev' for development
// and 'prod' for production.

app.set('views', __dirname + '/views');
app.set('view engine', 'jade');

if (process.env.NODE_ENV === 'development') {
    app.set('view cache', false);
} else {
    app.set('view cache', true);
}


// NOTE: Searching for this, most results will produce the older way of doing this.
// This is no longer the recommended way because 'app.configure' is removed in 
// Express 4.x, and if you haven't already, I recommend upgrading to it before 
// releasing or ASAP if you've already released.
//
// The old way:
app.configure(function() {
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade');
});

app.configure('production', function() {
    app.set('view cache', true);
});

app.configure('development', function() {
    app.set('view cache', false);
});