Node.js

Introduction The MERN stack—comprising MongoDB, Express.js, React, and Node.js—is one of the most popular full-stack development frameworks today. It enables developers to build modern, scalable web applications using a single language, JavaScript, across the entire stack. If you’re eager to become proficient in MERN development, this guide will take you from zero to hero with a structured learning path and high-quality resources. What is the MERN Stack? MongoDB: A NoSQL database that stores data in flexible JSON-like documents. Express.js: A minimal and flexible Node.js web application framework for building APIs. React: A front-end JavaScript library for building dynamic user interfaces. Node.js: A JavaScript runtime environment that lets you run JavaScript on the server. Together, these technologies allow you to build a full-stack web application where the frontend, backend, and database seamlessly interact[1][8]. ...

Introduction The Node.js event loop is the beating heart of every Node application. It powers non-blocking I/O, orchestrates timers, resolves promises, schedules callbacks, and coordinates the thread pool. Understanding it deeply is the difference between apps that feel crisp and resilient under load, and apps that stall, leak resources, or starve I/O. This tutorial takes you from beginner-friendly mental models to advanced, production-grade techniques. You’ll learn what the event loop is, how it’s implemented (libuv), the phases and microtask semantics, how timers work, how to measure and improve event loop health, and how to avoid common pitfalls like starvation and blocking. By the end, you’ll be comfortable reasoning about execution order, building reliable async flows, and tuning performance with confidence. ...