问如何存储Node.js部署设置/配置文件？

config.json：

{

    "username" : "root",

    "password" : "foot"

}

app.js：

var config = require('./config.json');

log_in(config.username, config.password);

var config = {};

config.twitter = {};

config.redis = {};

config.web = {};

config.default_stuff =  ['red','green','blue','apple','yellow','orange','politics'];

config.twitter.user_name = process.env.TWITTER_USER || 'username';

config.twitter.password=  process.env.TWITTER_PASSWORD || 'password';

config.redis.uri = process.env.DUOSTACK_DB_REDIS;

config.redis.host = 'hostname';

config.redis.port = 6379;

config.web.port = process.env.WEB_PORT || 9980;

module.exports = config;

"dependencies": {

  "cradle": "0.5.5",

  "jade": "0.10.4",

  "redis": "0.5.11",

  "socket.io": "0.6.16",

  "twitter-node": "0.0.2",

  "express": "2.2.0"

}