Inside the JavaScript Event Loop: How the Runtime Actually Works

Understand the JavaScript event loop in depth. Learn how the call stack, microtasks, and macrotasks work together to handle asynchronous code efficiently, keeping your applications fast, predictable, and responsive.

React Free Weekend: 48 hours of Open Access to Premium React Certification Training

Every year, we at Certificates.dev look for ways to make our certifications more accessible - not just for teams inside big tech companies, but for every developer who wants to validate their skills through real-world, hands-on learning. That’s why we are excited to announce our first-ever React Free Weekend, taking place on November 15–16, 2025.

Error Handling in React with react-error-boundary

Learn how to handle errors in React applications with react-error-boundary. Explore fallback UIs, async error handling with useErrorBoundary, and React 19's automatic error boundary integration with form actions and useTransition.

Document Fragments: The Secret to Fast, Clean DOM Manipulation in JavaScript

Discover how DocumentFragment can dramatically speed up DOM manipulation in JavaScript. Learn how to batch element creation in memory, avoid reflows, and build smoother, faster interfaces with clean, efficient code.

Wait for that tick

Learn how Vue's nextTick works, why DOM updates are batched, and how to avoid timing issues when working with refs and animations.

Exploring Server Components in Nuxt

Nuxt offers experimental features like Server Components to take make performant applications. Let’s take a look back at how hydration works and how Nuxt handles Server Side Rendering.

Building Reusable Components with React 19 Actions

Build reusable React components with React 19 Actions using useTransition() and useOptimistic(). Learn how to track pending states, implement optimistic updates, and expose action properties for custom logic in the Next.js App Router with practical examples.

Falling with Style

Learn how Vue.js fall-through attributes work, when they're useful, and common pitfalls to avoid. Master class, style, and event handling in components.

Use Lighthouse to improve your Angular applications

Angular developers often focus on code structure and framework mastery—but end users care most about speed, accessibility, and visibility. This article highlights how tools like Google Chrome’s built-in Lighthouse can help you measure and improve your app’s performance, accessibility, and SEO. By running quick audits and reviewing actionable insights, developers can bridge the gap between technical excellence and real-world user experience.