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

Further Information

If you still don't see what you are looking for, here more resources to check:

The wiki may have more pages which are not directly linked from here.
Review questions tagged with node-config on StackExchange. These are monitored by node-config contributors.
Search the issue tracker. Hundreds of issues have already been discussed and resolved there.

Contributors

lorenwest	markstos	elliotttf	jfelege	leachiM2k	josx
enyo	arthanzel	eheikes	diversario	th507	Osterjour
nsabovic	ScionOfBytes	simon-scherzinger	axelhzf	benkroeger	IvanVergiliev
jaylynch	jberrisch	kgoerlitz	leonardovillela	nitzan-shaked	robertrossmann
roncli	superoven	wmertens	XadillaX	ncuillery	patrickpilch