Jest debugging: Use --runInBand, Chrome DevTools, debugger statements. Isolate issues with test.only(). Leverage snapshots, mocks, and timer mocks. Check environment variables. Write clear descriptions. Optimize performance with beforeAll/afterAll.

Guarding Your Node.js Castle with Express API Rate Limiting

Jest and TypeScript enhance JavaScript testing. Advanced typing techniques improve robustness and type safety. Key areas include type assertions, mocking, asynchronous code, mapped types, React components, generics, custom matchers, and error testing.

Keeping State Cool and Under Control with MobX

Let The Compiler Play Matchmaker with Type Inference

Breaking Language Barriers with Multilingual Express.js Apps

Jest mocking techniques for global objects offer control in testing. Spy on functions, mock modules, manipulate time, and simulate APIs. Essential for creating reliable, isolated tests without external dependencies.

Microservices architecture with Node.js and Docker offers flexible, scalable app development. Use Docker for containerization, implement service communication, ensure proper logging, monitoring, and error handling. Consider API gateways and data consistency challenges.

Caching in Node.js boosts performance using Redis and memory cache. Implement multi-tiered strategies, cache invalidation, and warming. Balance speed with data freshness for optimal user experience and reduced server load.

Memory leaks in Jest can slow tests. Clean up resources, use hooks, avoid globals, handle async code, unmount components, close connections, and monitor heap usage to prevent leaks.

Testing with Jest: Aim for high coverage, focus on critical paths, use varied techniques. Write meaningful tests, consider edge cases. 100% coverage isn't always necessary; balance thoroughness with practicality. Continuously evolve tests alongside code.

Node.js streams enable efficient data processing by handling information piece by piece. They excel in file processing, data transformation, network communication, and real-time data handling, improving performance and memory usage.