How to handle errors in Node.js: try/catch, error-first callbacks, promises, and event emittersNode.js errors come in several asynchronous styles, and each has its own correct way to be caught. This guide explains try/catch for synchronous code, error-first callbacks, promise rejection handling, and the 'error' event for streams and event emitters.How to add JWT authentication to a Node.js API: a practical guideStep-by-step implementation of JWT authentication on a Node.js/Express API: password hashing, login endpoint, token verification middleware, refresh tokens, and the common security pitfalls.How to implement rate limiting in Node.js: algorithms and practical examplesRate limiting protects Node.js APIs from abuse and overload. This guide explains fixed window, sliding window, and token bucket algorithms, shows how to add rate limiting to an Express API, and how to test it.How to build a REST API with Node.js and ExpressLearn to create a production-ready RESTful API using Node.js and Express: setup, routing, middleware, environment variables, error handling, and deployment best practices — with a practical CRUD example for managing resources. 