Configure your Node.js Applications

      release notes

Introduction

Node-config organizes hierarchical configurations for your app deployments.

It lets you define a set of default parameters, and extend them for different deployment environments (development, qa, staging, production, etc.).

Configurations are stored in configuration files within your application, and can be overridden and extended by environment variables, command line parameters, or external sources.

This gives your application a consistent configuration interface shared among a growing list of npm modules also using node-config.

Project Guidelines

• Simple - Get started fast
• Powerful - For multi-node enterprise deployment
• Flexible - Supporting multiple config file formats
• Lightweight - Small file and memory footprint
• Predictable - Well tested foundation for module and app developers

Quick Start

The following examples are in JSON format, but configurations can be in other file formats.

Install in your app directory, and edit the default config file.

$ npm install config
$ mkdir config
$ vi config/default.json

{
  // Customer module configs
  "Customer": {
    "dbConfig": {
      "host": "localhost",
      "port": 5984,
      "dbName": "customers"
    },
    "credit": {
      "initialLimit": 100,
      // Set low for development
      "initialDays": 1
    }
  }
}

Edit config overrides for production deployment:

 $ vi config/production.json

{
  "Customer": {
    "dbConfig": {
      "host": "prod-db-server"
    },
    "credit": {
      "initialDays": 30
    }
  }
}

Use configs in your code:

var config = require('config');
//...
var dbConfig = config.get('Customer.dbConfig');
db.connect(dbConfig, ...);

if (config.has('optionalFeature.detail')) {
  var detail = config.get('optionalFeature.detail');
  //...
}

config.get() will throw an exception for undefined keys to help catch typos and missing values. Use config.has() to test if a configuration value is defined.

Start your app server:

$ export NODE_ENV=production
$ node my-app.js

Running in this configuration, the port and dbName elements of dbConfig will come from the default.json file, and the host element will come from the production.json override file.

Articles

• Configuration Files
• Common Usage
• Environment Variables
• Reserved Words
• Command Line Overrides
• Multiple Node Instances
• Sub-Module Configuration
• Configuring from a DB / External Source
• Securing Production Config Files
• External Configuration Management Tools
• Examining Configuration Sources
• Using Config Utilities
• Upgrading from Config 0.x

Contributors

lorenwest	markstos	elliotttf	leachiM2k	josx	enyo
arthanzel	rundef	eheikes	diversario	th507	Osterjour
nsabovic	ScionOfBytes	simon-scherzinger	axelhzf	benkroeger	IvanVergiliev
jaylynch	jberrisch	nitzan-shaked	robertrossmann	roncli	superoven
wmertens	ncuillery	adityabansod	thetalecrafter	abh	bertrandom

License

May be freely distributed under the MIT license.

Copyright (c) 2010-2015 Loren West and other contributors