Answers for "how to structure env in dotenv"

dotenv

//first install this
npm install dotenv

//then add this on the top of the your code
require("dotenv").config();

//first create file with name of .env 
DB_HOST=localhost
DB_USER=root
DB_PASS=s1mpl3

//then use it 
const db = require('db')
db.connect({
  host: process.env.DB_HOST,
  username: process.env.DB_USER,
  password: process.env.DB_PASS
})

node dotenv

require('dotenv').config();

console.log(process.env.MY_ENV_VAR);