Run npm i and then npm start in the project folder.

The following things need to be in your .env file.

REACT_APP_LOGIN_URL={login_url}
REACT_APP_API_URL=http://localhost
REACT_APP_API_PORT=7373

Generate a login URL from here.

I'm using this project to learn React. Don't read this code to learn, there are many mistakes in this code and there are plenty more to be made. Learn from here instead.