what dotenv is for 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: dotenv not loading process.env in node

Rename your file to just .env, removing any prefix
require it as early as possible in your application with the code snippet below
require('dotenv').config();