• back-and-front
    • 0 one-on-one
    • 1 simple-file-server
    • 2 adequate-file-server
    • 3 modular-server-with-api
  • backend-only
    • 0 one-response
    • 1 few-routes-one-view
    • 2 basic-modular-server
  • frontend-only
    • 0 zero-level
    • 1 very-basic
    • 2 basic-with-pages
    • 3 basic-with-commons
    • 4 advancing-with-outer-source
  • modularity