It is just helper for parsing configuration that you passing with environment variables to javascript object.

Use it with node.js version that support es6 specification

$ npm install @dormi/node-configenv --save

const ConfigEnv = require('@dormi/node-configenv');
const config = new ConfigEnv(configMap, options);

Format: {[envName]: [envOptions]}

Environment name for setting options

__ will be parsed as deep level

_ will be parsed as camel case

For example:

{
    API__APP_PORT: 8090
}

Will be parsed as:

{
    api: {
        appPort: 8090
    }
}

Options object for environment variable. If it not an object it will be used as default value.

required: false - Check for setting environment variable, default: false

default: value - Set default value if environment variable is undefined

global: true - Set your config to global.config. default: false

parse: true - Parse strings to primitives. e.g "[1, 2, 3]" will be parsed to array of numbers [1, 2, 3]. default: false

envFile: true - Load environment variables from file. If true it will search .env file in project root. Can be string path. default: false

Create configuration:

const ConfigEnv = require('@dormi/node-configenv');
const config = new ConfigEnv({
    PORT: {default: 8080},
    MONGO__URL: {default: 'mongodb://localhost:27017/dbname'}
}, {global: true, parse: true});

Run node.js program with env variables:

PORT=9000 node index.js

global.config will be:

{
    port: 9000,
    mongo: {
        url: 'mongodb://localhost:27017/dbname'
    }
}

Create configuration:

const ConfigEnv = require('@dormi/node-configenv');
const config = new ConfigEnv({
    PORT: {default: 8080},
    MONGO__URL: {default: 'mongodb://localhost:27017/dbname'}
}, {global: true, parse: true, envFile: true});

Create .env file in project root:

PORT=9000
MONGO__URL=mongodb://localhost:27020/some

global.config will be:

{
    port: 9000,
    mongo: {
        url: 'mongodb://localhost:27020/some'
    }
}