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// 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
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This is used to add a specific path to locate the .env file if we use like this
.config() then this is finding .env file in our cwd - current working directory.
require('dotenv').config({ path: '/custom/path/to/.env' })