Best way to store DB config in Node.Js / Express app

Here’s how I do it:

Create a config.js which contains objects representing your configs:

var config = {
development: {
    //url to be used in link generation
    url: 'http://my.site.com',
    //mongodb connection settings
    database: {
        host:   '127.0.0.1',
        port:   '27017',
        db:     'site_dev'
    },
    //server details
    server: {
        host: '127.0.0.1',
        port: '3422'
    }
},
production: {
    //url to be used in link generation
    url: 'http://my.site.com',
    //mongodb connection settings
    database: {
        host: '127.0.0.1',
        port: '27017',
        db:     'site'
    },
    //server details
    server: {
        host:   '127.0.0.1',
        port:   '3421'
    }
}
};
module.exports = config;

Then in my index.js (or wherever really),

var env = process.env.NODE_ENV || 'development';
var config = require('./config')[env];

Then process with that object, e.g.

var server = express();
server.listen(config.server.port);
...