From the OpenReplay Blog
When to Run Your Code: Page Load Events Explained
Compare DOMContentLoaded, the load event, Page Visibility API, and React useEffect to choose the correct JavaScript initialization hook for any project.
How to Build a Dark Mode Toggle with CSS and JavaScript
Build a dark mode toggle using CSS custom properties, JavaScript persistence, and system preference detection to deliver accessible, flash-free theme switching.
Exploring Zed: The New Open-Source Editor for Modern Devs
Zed is a Rust-based open-source editor with GPU acceleration, TypeScript support, AI tools, and built-in real-time collaboration for frontend developers.
Bring AI to Your Command Line With Cursor CLI
Cursor CLI brings AI coding to your terminal, letting you generate React components, update Vite configs, and automate frontend tasks without switching tools.
How to Build an Upload Progress Bar with JavaScript
Build a real-time upload progress bar with XMLHttpRequest, semantic HTML, and ARIA attributes for accessible visual feedback during file uploads.
The Best Tailwind Plugins for Faster Development
Compare the top Tailwind CSS plugins for typography, forms, animation, and RTL support to choose the right tools for faster production development.
JavaScript Variable Declarations: Understanding var, let, and const
Compare var, let, and const across ES6 variable scope, hoisting, and the Temporal Dead Zone to write JavaScript that prevents bugs and signals clear intent.
How to Install and Tweak VS Code Themes
Install VS Code themes from the Marketplace and customize workbench colors and syntax highlighting through settings to build a personalized coding environment.
A Quick Guide to MIME Types and Content-Type Headers
Fix broken CSS, JSON, and JavaScript by configuring Content-Type headers correctly and preventing MIME sniffing with the X-Content-Type-Options header.
Getting Started with Aider: AI-Powered Coding from the Terminal
Set up Aider to run LLM-powered pair programming from your terminal, manage git commits, configure API keys, and optimize token costs across multiple models.
Building Flexible Spacing and Containers with CSS Clamp
Build fluid responsive layouts using CSS clamp for spacing and containers without endless media queries. See the math, patterns, and browser support details.
How to Debug Memory Leaks in JavaScript
Debug JavaScript memory leaks using Chrome DevTools heap snapshots, allocation timelines, and retainer path analysis to identify and fix common leak patterns.
Understanding CORS: Why Your Request Failed
Break down CORS errors by understanding Same-Origin Policy, preflight requests, and browser enforcement of cross-origin headers to debug failures effectively.
What Are Source Maps and How Do They Work
Source maps bridge minified bundles to original TypeScript source. See how VLQ encoding, Webpack, and Vite configuration enable secure production debugging.
Garuda Linux: The Arch Distro You Might've Missed
Garuda Linux brings Arch power, AUR access, and BTRFS snapshots to developers who want a fast, preconfigured setup without manual configuration.
How to Create and Run Custom User Scripts in Your Browser
Create and run browser userscripts using Tampermonkey or Violentmonkey, handle DOM timing with MutationObserver, and avoid common race condition pitfalls.
What You Can Learn from Chrome's Network Tab
Analyze Chrome DevTools Network tab data to identify TTFB issues, debug HTTP requests, and use throttling to expose real performance problems.
How to Build Your First Firefox Extension
Build a working Firefox extension using Manifest V3 and WebExtensions APIs, covering content scripts, popup interfaces, and minimal permissions best practices.
Understanding Lifecycle Hooks in Vue.js
Vue 3 lifecycle hooks explained through the Composition API, covering setup, onMounted, onUpdated, and onUnmounted for cleaner, more performant components.
Working with Forms in Angular: Template vs Reactive
Compare Angular Template-Driven and Reactive Forms, weigh validation and testability trade-offs, and select the right form architecture for your application.
Understanding JavaScript Error Types and Messages
Each JavaScript error type from SyntaxError to RangeError signals a specific problem. Use try-catch blocks to handle failures and debug code faster.
Fix 'sh: command not found: npm' on macOS and Linux
Fix the npm command not found error on macOS and Linux by diagnosing PATH issues, installing Node.js, and configuring nvm for reliable shell access.
How to Build a File Upload with Dropzone.js
Build a drag and drop file upload interface with Dropzone.js, including progress bars, file validation, and backend integration using pure JavaScript.
A Beginner's Guide to Sending Emails with Node.js
Set up Node.js email sending using Nodemailer, Gmail, and Mailtrap while applying security best practices for reliable backend email functionality.