node-env-loader

Install

yarn add node-env-loader

# or

npm install --save node-env-loader

Usage

Create env.json in the root directory

{
  "NODE_ENV": "development",
  "LOCAL": true
}

Load the config

// app.js
import envLoader from 'node-env-loader'

envLoader({
  path: './env.json', // default to be './env.json'
  encoding: 'utf8', // default to be 'utf8'
})
/**
 * shorthand
 * envLoader('./env.json')
 */

console.log(process.env.NODE_ENV) // 'development'
console.log(process.env.LOCAL) // 'true'

It won't cover which existed

// app.js
import envLoader from 'node-env-loader'

process.env.NODE_ENV = 'production'

envLoader()

console.log(process.env.NODE_ENV) // 'production'