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NestJS best practices and architecture patterns for building production-ready applications. Use when writing, reviewing, or refactoring NestJS code to ensure proper patterns for modules, dependency injection, security, testing, and performance.
| name | nestjs-best-practices |
| description | NestJS best practices and architecture patterns for building production-ready applications. Use when writing, reviewing, or refactoring NestJS code to ensure proper patterns for modules, dependency injection, security, testing, and performance. |
Comprehensive best practices guide for NestJS applications. Contains 40 rules across 10 categories, prioritized by impact to guide automated refactoring and code generation.
Reference these guidelines when:
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Architecture | CRITICAL | arch- |
| 2 | Dependency Injection | CRITICAL | di- |
| 3 | Error Handling | HIGH | error- |
| 4 | Security | HIGH | security- |
| 5 | Performance | HIGH | perf- |
| 6 | Testing | MEDIUM-HIGH | test- |
| 7 | Database & ORM | MEDIUM-HIGH | db- |
| 8 | API Design | MEDIUM | api- |
| 9 | Microservices | MEDIUM | micro- |
| 10 | DevOps & Deployment | LOW-MEDIUM | devops- |
arch-avoid-circular-deps - Avoid circular module dependenciesarch-feature-modules - Organize by feature, not technical layerarch-module-sharing - Proper module exports/imports, avoid duplicate providersarch-single-responsibility - Focused services over "god services"arch-use-repository-pattern - Abstract database logic for testabilityarch-use-events - Event-driven architecture for decouplingdi-avoid-service-locator - Avoid service locator anti-patterndi-interface-segregation - Interface Segregation Principle (ISP)di-liskov-substitution - Liskov Substitution Principle (LSP)di-prefer-constructor-injection - Constructor over property injectiondi-scope-awareness - Understand singleton/request/transient scopesdi-use-interfaces-tokens - Use injection tokens for interfaceserror-use-exception-filters - Centralized exception handlingerror-throw-http-exceptions - Use NestJS HTTP exceptionserror-handle-async-errors - Handle async errors properlysecurity-auth-jwt - Secure JWT authenticationsecurity-validate-all-input - Validate with class-validatorsecurity-use-guards - Authentication and authorization guardssecurity-sanitize-output - Prevent XSS attackssecurity-rate-limiting - Implement rate limitingperf-async-hooks - Proper async lifecycle hooksperf-use-caching - Implement caching strategiesperf-optimize-database - Optimize database queriesperf-lazy-loading - Lazy load modules for faster startuptest-use-testing-module - Use NestJS testing utilitiestest-e2e-supertest - E2E testing with Supertesttest-mock-external-services - Mock external dependenciesdb-use-transactions - Transaction managementdb-avoid-n-plus-one - Avoid N+1 query problemsdb-use-migrations - Use migrations for schema changesapi-use-dto-serialization - DTO and response serializationapi-use-interceptors - Cross-cutting concernsapi-versioning - API versioning strategiesapi-use-pipes - Input transformation with pipesmicro-use-patterns - Message and event patternsmicro-use-health-checks - Health checks for orchestrationmicro-use-queues - Background job processingdevops-use-config-module - Environment configurationdevops-use-logging - Structured loggingdevops-graceful-shutdown - Zero-downtime deploymentsRead individual rule files for detailed explanations and code examples:
rules/arch-avoid-circular-deps.md
rules/security-validate-all-input.md
rules/_sections.md
Each rule file contains:
For the complete guide with all rules expanded: AGENTS.md
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