express-typescript-api-best-practices

Build production-ready REST APIs using Express and TypeScript by implementing a layered architecture (Routes → Controllers → Services → Models) with SOLID principles, JWT authentication, Zod validation, Argon2 password hashing, and OpenAPI/Swagger documentation for enterprise-grade scalability and security.

Implement RBAC in Express by combining JWT tokens with role-based middleware in your controller layer, validating permissions before service execution, and documenting access policies in OpenAPI specs for consistent enforcement across all endpoints.

Validate requests using Zod schemas in your controller layer, then generate OpenAPI/Swagger documentation from those schemas and endpoint definitions to create both runtime validation and comprehensive API documentation automatically.

Yes. Sequelize integrates into the Models layer of a layered architecture, enabling transaction management patterns and performance optimization while keeping database logic separate from business logic in Services.

JWT tokens are stateless but cannot be revoked mid-session without external state stores. Pair JWT with short expiration windows, refresh token rotation, and role-based validation in middleware to mitigate token compromise and enforce access policies in production.

TypeScript is not strictly required but provides type safety that catches validation and schema errors at compile time, reducing runtime failures and making layered architecture contracts (between Routes, Controllers, Services) explicit and verifiable.