MYSQL
DB_NAME=
DB_PASSWORD=
DB_USER=root

MONGODB
Open Mongosh - copy string and add to:

-- config file notes

// Config is the only access of 'dotenv'

import dotenv from "dotenv";

dotenv.config();

export default {
  port: process.env.PORT || 3000,
  db: process.env.DB_CLIENT_URL,
};