Introduction

dotenv-Manipulator :

• Loads environment variables from a .env file to process.env
• Adds, updates, or removes variables from both your .env file and process.env at runtime
• Has no dependency (you don't need the dotenv package)

Installation

npm i dotenv-manipulator

Import/require

const Manipulator = require('dotenv-manipulator')
// or
import Manipulator from 'dotenv-manipulator'

Setup and start

Manipulator constructor has 3 optional arguments:

new Manipulator(envPath, throwable, encoding)

• Path to .env, default is process.cwd().
• If set to true functions throw errors whenever there's an incorrect input.
• Specify file encoding, default is utf8.

// basic setup
const Manipulator = require('dotenv-manipulator')
const dotenvM = new Manipulator()

// complete setup
const Manipulator = require('dotenv-manipulator')
const dotenvM = new Manipulator('/path/to/project', false, 'utf-8')

// undefined = default value
const Manipulator = require('dotenv-manipulator')
const dotenvM = new Manipulator(undefined, true, 'latin1')

Manipulate

Add

Add object keys and values to .env file and process.env

const obj = { REMOTE: '95.81.123.228', PORT: 3000 }
dotenvM.add(obj)
console.log(process.env.REMOTE) //=> '95.81.123.228'
console.log(process.PORT) //=> '3000'

.env file :

PORT=3000
REMOTE=95.81.123.228

Update

To update a variable use

dotenvM.add(obj, true)

Example

Before

• console.log(process.env.REMOTE) //=> '95.81.123.228'

•  PORT=300
   REMOTE=95.81.123.228

Then

dotenvM.add({ REMOTE : '38.10.10.25' }, true)

After

• console.log(process.env.REMOTE) //=> '38.10.10.25'

• PORT=300
  REMOTE=38.10.10.25

Remove

Remove variable(s) from .env file and process.env

dotenvM.remove(input)

Inputs are keys from an object, an array or a string :
here's three way to achieve the same result.

// #1
dotenvM.remove('REMOTE')
dotenvM.remove('PORT')

// #2
dotenvM.remove(['REMOTE', 'PORT'])

// #3
dotenvM.remove({ REMOTE: 'value that dotenvM wont read', PORT: 'no.. really it doesnt care' })

Try catch and DEBUG

Here's two example :

// DEBUGGING
dotenvM.throwable = false

let debug = dotenvM.add(['wrong', 'type', 'of', 'data'])
let debug_1 = dotenvM.add({ GOOOD: 'type', OF: 'data' })
console.log(debug.message)
//=> [ADD_ERROR]: object must be [object Object] but received [object Array]
console.log(debug_1)
//=> undefined

// TRY CATCH
dotenvM.throwable = true

try {
  dotenvM.add(['wrong', 'type', 'of', 'data'])
} catch(e) {
  console.log(e.message)
  //=> [ADD_ERROR]: object must be [object Object] but received [object Array]
}

API

Full documentation available here