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One of the fundamental problems of software development is keeping configuration information for different environments. Most organizations distinguish environments such as DEV, QA, Staging, and Production.

The configuration approach promoted by this little utility makes it uncesseary to keep an elaborate build process supporting these different enviroments. Using this utility, configuration information can be stored in embedded defaults that can be overriden using a configuration file and environment variables.


var path = require('path'),
    loadConfig = require('server-config'),
    ec2instance = loadConfig.ec2instance,
    embedded = {
      "httpPort": 80,
      "httpsPort": 443,
      "seaPort": 9090
    host = '~/.defaults.json#myapp',
    env = {
        mongdb: process.env["MONGODB"],
        seaPort: process.env["SEA_PORT"]
    ec2 = {

    loadConfig(embedded, host, env, ec2, function(err, config) {
        if (err) {
          throw err();

Let's further assume the host file contains:

  "myapp": {
    "httpPort": 3000,
    "mongodb": "mongodb://localhost/testbase",
    "welcomeMsg: "Hellow World!"

Lastly, let's assume that there is one evnironment variable defined:

export SEA_PORT=2000

If all this is the case, the resulting config information returned by the call above would be:

  "httpPort": 3000,
  "httpsPort": 443,
  "welcomeMsg: "Hellow World!",
  "seaPort": 2000