js-tweaker

Simple configuration management, intended for use with node.js. Minimal dependencies.

This library lets you define a set of configuration files for different environments easily.

Initially created for Viafoura

Installation

Install using NPM:

npm install js-tweaker --save

Usage

First define your configuration files. These can be either .js or .json files. The default location for these files is in the config/ directory of your project root. You can define application wide defaults using a default.json or default.js file.

A typical project tree could look something like this:

| config/
\-- config/default.json
\-- config/development.js
\-- config/live.js
| app.js

default.json

{
    "key": "value"
}

development.js

module.exports = {
    key: "development"
};

live.js

module.exports = {
    key: "live"
};

To read the configuration files into your application:

var jsTweaker = require('js-tweaker');

//optionally customize the behavior
jsTweaker.options({
    // options (and default values)
    // configDir: "./config/", //path to config files
    // env: "dev", //any environment identifier you like, defaults to process.env.NODE_ENV or 'development'
    // fileList: ['default', '{ENV}'], //which order to search for files
});

jsTweaker(function (err, config) {
    if (err) {
        //something went wrong
    }
    //configuration is loaded

    //config.env property is automatically set to the value you originally
    //passed in
});

Alternatively, if you don't want to use a callback, simply don't pass in any parameters, and the config is loaded synchronously and returned.

var jsTweaker = require('js-tweaker');

jsTweaker.options({}); //set some options

try {
    var config = jsTweaker(); //get the config
}
catch (e) {
    //an exception will be thrown on error
}

Or the shorthand:

var config = require('js-tweaker')();

Options

###configDir The configDir option can be used to customize the directory that is searched for configuration files.

###env The env option determines which environment specific configuration file(s) are loaded.

###fileList The fileList option is the most powerful, and lets you load multiple configuration files and merge them together in the order you like. You can specify a substitution macro for the selected environment by putting {ENV} anywhere in a string.

• Only load a single config file:

["custom"]

* Only load a single environment specific config file:
```javascript
["{ENV}"]

• Load a default file and then merge in an environment specific file:

['default', '{ENV}']

* Load a default file and then merge in a variety of different configs:
```javascript
['default', '{ENV}/database', '{ENV}/filesystem', '...']

This could let you organize your configuration files very nicely by keeping separate categories of options apart.