ih-config

A common configuration module to abstract precedence of config options.

about

ih-config is a lightweight wrapper on top of the https://github.com/flatiron/nconf module, which abstracts access to various configuration stores. Configuration data may come from files, machine environment variables, or the node command line.

usage

• require the module

var config = require('ih-config');

• get a config value

var foo = config.get('foo');

// nested property access
var bar = config.get('foo:bar');

config stores

ih-config supports 3 types of configuration storage, and 4 levels of precedence (listed from highest to lowest precedence):

• CMD params - command line parameters, passed to node
• ENV variables - machine environment variables
• files - JS files, located in a directory in the root of your project named config
  • *.config.local.js takes precedence over
  • *.config.js

config files

Config files must be placed in the root config directory. Files should match for format *.config.js in order to be included. Additionally, files matching *.config.local.js are also parsed. Local files take precedence over non-local files. Normally a repo should ignore config/*.local.*, allowing developers to override properties as needed, without committing those changes to the repository.

environment variables

Machine environment variables are included in the available configuration data. This is the same set of data normally provided by node under process.env.

command line parameters

Config data may also be set directly from the command line, when starting node. To set a parameter value, prefix it with two dashes, and place an equals sign between the value. For example: --value='hello world' Note that command line parameters take the highest priority.