configya

Stupid simple configuration.

What & How

configya reads the following:

• environment variables
• optional configuration
• defaults hash

Note: you can now provide both a configuration file and a defaults object

Unless you've set a deploy-type environment variable = 'DEV', configya will always overwrite keys from a configuration file and defaults hash with duplicates found in the environment.

Key Parsing

configya parses all sources into an object hierarchy based on _ delimited key names. For example, if you have a key named RABBIT_BROKER_IP set to '127.0.0.1', and another named RABBIT_BROKER_PORT set to 5672, the resulting configuration object will be:

{
    rabbit: {
        broker: {
            ip: "127.0.0.1",
            port: "5672"
        }
    }
}

Note: All keys are lower-cased to eliminate the need for guessing games (and capslock)

Original Keys

The original keys are technically still stored on the object based on their source.

• _env_ for original environment keys
• _defaults_ for keys coming from a defaults hash
• _file_ for keys coming from a file

Note: These are really here for diagnostic/backwards compatibility. You shouldn't use/rely on them in your code.

Usage

    //without a config file or defaults (using only environment)
    var cfg = require( 'configya' )();

    //with a config file as well
    var cfg = require( 'configya' )( './path/to/configuration.json' );

    //with a defaults hash
    var cfg = require( 'configya' )( { RABBIT_BROKER_PORT: 5672 } );

    //with defaults and a config (order of args doesn't matter)
    var cfg = require( 'configya' )( { rabbit: { broker: { port: 5672 } } }, './path/to/configuration.json' );

    var port = cfg.rabbit.broker.port; // etc.

Backwards Compatibility

The original version of configya used a get method to retrieve configuration values with the ability to specify a default/fallback if the key were missing. This is technically still supported, but we think the new approach (nested keys) is nicer. Here's an example of the original API:

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

    // get the value from the config file, if an 
    // environment variable is present the environment
    // variable ALWAYS trumps the file setting unless 
    // you have deploy-type=DEV in your env settings
    config.get( 'key' );

    config.get( 'key', defaultValue );