Express Backend Bundle

Express testing patterns including unit tests, integration tests, API endpoint testing, mocking databases, testing middleware, testing authentication. Use when writing tests for Express APIs, testing controllers and services, mocking dependencies, or testing middleware.

REST API design, response formatting, versioning, pagination, filtering, sorting, error responses, status codes. Use when designing REST APIs, implementing pagination, filtering, versioning strategies, designing error response formats, or structuring API response formats.

Express middleware patterns including authentication, validation, error handling, rate limiting, request logging, CORS, compression. Use when implementing auth middleware, input validation, error handlers, rate limiting, request/response logging, or security middleware.

Database integration patterns for PostgreSQL and MongoDB, connection pooling, query patterns, transactions, repositories, ORM setup (Prisma, TypeORM). Use when setting up database connections, writing database queries, implementing repositories, managing migrations, or handling transactions.

Express.js setup, server initialization, middleware configuration, request/response handling, routing basics, TypeScript integration, middleware pipeline. Use when setting up new Express servers, configuring middleware, creating routes, or understanding Express architecture and request/response lifecycle.

JWT authentication, OAuth 2.0, session management, password hashing, refresh tokens, multi-factor authentication, API keys. Use when implementing user authentication, token management, authorization, password reset flows, or securing APIs.