How to store Node.js deployment settings/configuration files?

Much later, I found a pretty good Node.js module for managing configuration: nconf.

A simple example:

var nconf = require('nconf');

// First consider commandline arguments and environment variables, respectively.
nconf.argv().env();

// Then load configuration from a designated file.
nconf.file({ file: 'config.json' });

// Provide default values for settings not provided above.
nconf.defaults({
    'http': {
        'port': 1337
    }
});

// Once this is in place, you can just use nconf.get to get your settings.
// So this would configure `myApp` to listen on port 1337 if the port
// has not been overridden by any of the three configuration inputs
// mentioned above.
myApp.listen(nconf.get('http:port'));

It also supports storing settings in Redis, writing configuration files, and has a fairly solid API, and is also backed by one of the more well-respected Node.js shops, Nodejitsu, as part of the Flatiron framework initiative, so it should be fairly future-proof.

Check out nconf at Github.