To start, you'll need to create an App on MongoDB Atlas(under app services) After that, create an .env file and add the id of your app on a PUBLIC_APP_ID variable. Example below:
PUBLIC_APP_ID=your_app
You'll need to turn on the Email/Password auth on MongoDB. This can be found on MongoDB Atlas on App Services > Authentication > Authentication Providers > Email/Password.
Once Mongo and your .env file have been configured, run the command below to start the app:
npm run dev