A pattern library for REST API design. Provides guidance on resource naming, choosing HTTP methods and status codes, error response formats, pagination, versioning, idempotency, authentication/authorization, and rate limiting. Use this when designing endpoints for a new API, reviewing the design of an existing API, or when you need decision criteria for a discussion about API conventions.
A collection of backend design and implementation patterns covering layering, input validation, N+1 queries and transactions, caching, error handling, authentication/authorization, rate limiting, structured logging, and background jobs, for NestJS / Django / Flask / Laravel / CakePHP. Use this when designing, implementing, or reviewing backend APIs, service layers, or jobs.
A pattern library for running database migrations safely. Covers universal principles such as backward compatibility, the expand/contract pattern, and rollback design; dangerous operations to avoid in PostgreSQL/MySQL; tool-specific notes for Django, Laravel, TypeORM, and Prisma; and lazy migration for DynamoDB. Use this when planning or reviewing schema changes, data migrations, or migration files.
A collection of Docker / Docker Compose best practices covering multi-stage builds, layer caching, image size reduction, security, healthchecks, and Compose-based dev environment setup. Reference this when creating, modifying, or reviewing a Dockerfile or docker-compose.yml.
A pattern library for building and operating a documentation site with Docusaurus. Covers i18n (ja/en) structure, automatic OpenAPI generation from NestJS, wiring OpenAPI/TypeDoc output into Docusaurus, type and client generation with openapi-typescript / orval, templates for hand-written reference pages, and CI freshness checks. Use this when setting up a new documentation site, adding pages, updating API references, syncing translations, or building a type-generation pipeline.
A pattern collection for Playwright-based E2E testing. Covers how to choose what to test in Next.js/Vue apps, selector strategy, wait strategy, test structure, test data management, flaky test countermeasures, and CI integration. Use when writing new E2E tests, reviewing E2E tests, investigating flaky tests, or analyzing test failures in CI.
A pattern collection for component design, state management, performance, forms, error handling, and accessibility in React (Next.js App Router) and Vue.js (Composition API). Use when creating or refactoring frontend components, deciding on a state management or data-fetching approach, or checking what to look for when reviewing frontend code.
A collection of integration-testing patterns for verifying actual database reads and writes. Covers the limits of mocking, isolating the test database, transaction rollback, and how to verify constraint violations, optimistic locking, and N+1 queries, for NestJS (TypeORM/Prisma), Django, Flask, Laravel, and CakePHP. Use this when writing or reviewing tests for DB-touching features, when you want to avoid a "green only because it's mocked" false sense of safety, or when designing how DB tests run in CI.