Confim NPM | npm.io

Confim

A smart configuration management module

What does it do

This modules allows you to easily manage the configuration of small and big applications with environment variable and multi environment support

Install

NPM has you covered: npm i -S confim

Example

Example configuration file config.js

module.exports = {
    modules: {
        database: {
            default: {
                port: 1234
            },
            development: {
                host: 'database.dev.internal'
            },
            integration: {
                host: 'database.int.internal'
            },
            production: {
                host: 'database.prod.internal'
            }
        }
    },
    shared: {
        default: {
             loglevel: "info"
            },
            "development": {
              "loglevel": "debug"
            },
            "integration": {
              "loglevel": "error"
            },
            "production": {
              "loglevel": "warn"
            }
    },
    aliases: {
        'primary-server': "web-server-two"
    }
};

  "shared": {
    "*": {
      "loglevel": "info"
    },
    "development": {
      "loglevel": "debug"
    },
    "integration": {
      "loglevel": "error"
    },
    "production": {
      "loglevel": "warn"
    }
  },
  "modules": {
    "web-server-one": {
      "*": {
        "port": 3000,
        "host": "127.0.0.1"
      },
      "development": {
        "host": "0.0.0.0"
      }
    },
    "web-server-two": {
      "*": {
        "port": 4000,
        "host": "127.0.0.1"
      },
      "development": {
        "host": "0.0.0.0"
      }
    },
    "database": {
      "*": {
        "loglevel": "info",
        "username": "foo",
        "database": "bar",
        "password": "___CONFIM___REQUIRED___"
      },
      "development": {
        "host": "localhost",
        "password": "weakPassFoLocal"
      },
      "integration": {
        "host": "db.integration.example.org"
      },
      "production": {
        "host": "db.production.example.org"
      }
    }
  }
}

What are we defining

three modules:
- web-server-one
- web-server-two (notice we defined loglevelwhich overrides the shared property)
- database
a shared loglevel property accessible to every module
an alias for web-server-two named primary-server

How it works

The default key in the modules and in the shared key is the default to use for any environment where the key is not defined. We use a special __CONFIM_REQUIRED__ key in database module. This makes sure that the value is present as environment variable or in a specific environment. In the example password is defined in development unlike integration and production. When you do not provide it via env DATABASE_password=bla and the environment is not development the app will fail as soon as the configuration is read from file

Get the data

Create a ìndex.js file in the same directory or a child directory of the config.js file and paste the following content.

// file: index.js

var Confim = require('confim').default; // import confim using es5
//import Confim from 'confim'; // import confim using es6

// Get database config merged with shared and of current environment
var dbConf = Confim('database').conf;
console.log(dbConf);

The only thing left to do before you run is install confim: npm i -S confim

Now try running the example: node index.js; When you try to run it in the production environment it will throw an error as the database password is not set: env NODE_ENV=production node index.js; This can be fixed by supplying the variable: env NODE_ENV=production DATABASE_password=yay! node index.js