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Lessons (5)

• REST vs GraphQL vs gRPC

  … Not meant for customers.  REST: resources over HTTP …

• N+1 Queries, Loading & Pagination

  … IN batch Map children back to parents correctly GraphQL/resolvers Request-scoped DataLoader Cache only for request, not …

• I — Interface Segregation Principle

  … for their needs, instead of one giant API. - GraphQL: clients request only the fields they need. - Repository interfaces …

• DRY: Don't Repeat Yourself

  … hand in the client Generate types from OpenAPI / GraphQL schema Config values copied between files One .env / config …

• Hexagonal Architecture (Ports & Adapters)

  … Port name Adapters --- --- --- Driving ForBorrowingBooks REST controller, CLI, GraphQL resolver, test Driving ForManagingCatalog Admin UI, import job Driven …