create a new environment file:
touch .env
edit file .env with script below:
PORT=3052
NODE_ENV=dev //current running env
//you can change config with your mongodb settings
DEV_DB_HOST=localhost
DEV_DB_PORT=27017
DEV_DB_NAME=shopDEV
PROD_DB_HOST=localhost
PROD_DB_PORT=27017
PROD_DB_NAME=shopPROD
run for dev:
npm run dev
run for prod:
npm run prod