Guides

Step-by-step guide to build a complete Task Management API with CRUD, validation, DI, modules, guards, and error handling.

Enterprise-grade security features: headers, rate limiting, CSRF protection, input sanitization, and more.

Learn how to implement authentication and authorization using guards in HazelJS.

Organize your application with modules. Learn about imports, exports, dynamic modules, and module composition.

Powerful middleware for request timeouts, CORS, rate limiting, and more.

Build RESTful APIs with decorator-based controllers and routing.

Handle errors gracefully with custom exception filters and error responses.

Transform requests and responses with interceptors for logging, caching, and more.

Transform and validate input data with pipes before it reaches your handlers.

Understand dependency injection and how to create and use providers.

Persistent memory system for AI agents: conversation tracking, entity memory, and facts.

Self-improving retrieval with query planning, self-reflection, and adaptive strategies.

Common RAG patterns and best practices for building intelligent search systems.

Use vector databases for semantic search: Memory, Pinecone, Qdrant, Weaviate, and ChromaDB.

Deploy HazelJS applications to AWS Lambda, Vercel, and other serverless platforms.