npm init -y
npm install (cors, dotenv, express, mongoose, nodemon)
"cors": "^2.8.5",
"dotenv": "^16.0.3",
"express": "^4.18.2",
"helmet": "^7.0.0",
"mongoose": "^7.1.0",
"nodemon": "^2.0.22"
.env used to save DATABASE_URI and PORT
must remove .env from being commited git rm .env --cached