use .env file code example
Example 1: nodejs dotenv path how to set
// when yours .env is in other place then default, you can set path to it
const path = require('path')
require('dotenv').config({ path: path.resolve(__dirname, '../../.env') }); //use as many '../' as you need
Example 2: .env file example
SOMEVAR="somevalue"
ANOTHERVAR="anothervalue"