config-resolver v0.2.0

Config Resolver

A small, unopinionated library for resolving configuration variables in various levels.

Installation

npm install --save config-resolve

Usage

Without any sort of configuration, config-resolver will look at your environment variables and your command line arguments and construct a resolved object of configuration, where the command line arguments override the environment ones.

So:

var conf = require('config-resolver')();
console.log(conf);

And run with

PORT=8080; NAME=MY_APP; node index.js --PORT=3000 --HOST=localhost

Will result in

{
    PORT: 3000
    NAME: 'MY_APP'
    HOST: 'localhost'
}

Resolvers

Config resolver comes with 3 (for now) configuration resolvers. A resolver is a function that reads/resolves configuration, and returns an object. The currently supported resolvers are CommandLineArgumentsResolver, EnvironmentVariablesResolver and JSONResolver.

You can override the default resolver chain by providing them as arguments to the resolve function:

var resolver = require('config-resolver');
var conf = resolver.resolve(resolver.JSONResolver('./config.json'), resolver.CommandLineArgumentsResolver);
console.log(conf);

In this example, resolver will take what's in config.json as the default configuration, and override properties with the same name from the command line arguments.