First you should install the nodejs packages:
movie-booking-web: npm install
movie-booking-admin: npm install
Once the packages installed properly via nodejs, you can start the applications by doing:
movie-booking-web: npm start
movie-booking-admin: npm start
The java spring boot application should be running for the front-end to work properly.
To run the spring boot app you can just press run on IntellIj IDE or another IDE.