Based on the work in this project.
This command will launch both of your backend and frontend server and do a data migration in your backend server
# Using yarn
yarn develop
Alternatively, you can still start your servers separately:
cd backend
# Using yarn
yarn build
yarn develop
cd frontend
# Using yarn
yarn develop
Next server is running here => http://localhost:3000 Strapi server is running here => http://localhost:1337