For helloService, create .env file with the content:

PORT=3001

For profileService, create .env file with the content:

PORT=3002
MONGO_URL="specifyYourMongoURLHereWithDatabaseNameInTheEnd"

Finally install packages in both the services by running the command npm install.

cd frontend
npm install
npm start

Note: This will run the frontend in the development server. To run in production, build the application by running the command npm run build