Obviously, it wont won't work until you add ".env" file
First, create a database and copy the connection link in './connection/mLab.js' (inside of template string)
Don't forget to do the following changes,
PORT = 4000// Replace the following by creating a user in mLab Database in Users Tab USER = #### PASS = $$$$
in the CMD, enter "npm intsall"
-> npm run dev
You're good to go