Should I use callbacks or async/await in Node.js?
Use async/await for modern code. It is cleaner, easier to read, and easier to debug than callbacks. Reserve callbacks for EventEmitter and old APIs that use them, but write new code with async/await.
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More FAQs in Node.js Best Practices Every Beginner Should Follow
Because unhandled errors crash the Node.js process. Always handle errors in async code with try/catch, and add a global error handler. In production, an unhandled error taking down your server is a serious problem.
Yes, always. Never hardcode secrets, database URLs, or configuration in code. Use dotenv and environment variables so each environment has its own config and secrets are not committed to git.
Because the event loop is single-threaded. Heavy synchronous code blocks all requests. Offload CPU-heavy work to worker threads or separate processes, so the main thread stays responsive for all connections.
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