From the OpenReplay Blog
Preventing Layout Shift with Modern CSS
Prevent layout shift by applying intrinsic sizing, metric-aligned font fallbacks, and compositor-safe animations to keep CLS scores below 0.1.
Making Sense of Type Narrowing in TypeScript
Build a mental model of TypeScript type narrowing, control flow analysis, discriminated unions, and user-defined type guards to eliminate type errors.
How to Generate & Embed QR Codes
Generate reliable QR codes in JavaScript using SVG or Canvas output, and avoid scan failures caused by quiet zones, contrast issues, and logo overlays.
Getting Creative with CSS Shape Functions
The CSS shape function creates responsive clip paths and motion paths using percentages, replacing fixed pixel coordinates that break when containers resize.
How to Fix '429 Too Many Requests' in Your Web App
Fix HTTP 429 Too Many Requests errors by applying frontend throttling, exponential backoff, retry logic, and rate limit header parsing in your web app.
Common Patterns for Configuring Node.js Projects
Node.js project configuration patterns for runtime pinning, lockfiles, ESM, TypeScript, and ESLint flat config help you make intentional setup choices.
The Most Useful MCP Servers for AI-Powered Development
MCP servers connect AI models to files, Git history, and live data. See which servers improve frontend development workflows using standardized tool access.
Smart Loading Patterns with htmx
Build faster dashboards by applying htmx loading patterns like lazy loading, viewport triggers, and progressive enhancement to defer slow queries effectively.
What Actually Belongs in the Head of Your Document
Know exactly what belongs in the HTML document head, from charset and viewport to social metadata, resource hints, and structured data ordering.
The Benefits of Using Strict Mode in Modern JavaScript
JavaScript strict mode rules, ESM automatic activation, and safer this binding help you prevent errors and debug legacy code with confidence.
Tools to Keep Your Node.js Projects Clean and Up to Date
Keep Node.js projects secure and current using Renovate, Dependabot, nvm, and audit tools to manage dependencies, runtime versions, and vulnerability drift.
Making Sense of Code Changes with diff
Interpret unified diff format, Git diff commands, semantic tools like Difftastic, and AI-assisted summaries to review frontend code changes with confidence.
Reactivity Without a Framework: What Native JS Can Do Today
Proxy, EventTarget, and browser observers enable reactive UI state tracking and DOM updates in vanilla JavaScript without shipping framework dependencies.
Drawing Layout-Friendly Shapes with the CSS xywh() Function
The CSS xywh() function defines rectangles with position and dimensions for responsive clip-path layouts. See how it compares to inset() across modern browsers.
How to Create and Publish an npm Package
Create and publish an npm package using ESM, TypeScript, and npm Trusted Publishing with GitHub Actions OIDC for secure, tokenless automated releases.
The Best Platforms for Hosting Modern JavaScript Apps
Compare Vercel, Netlify, Cloudflare, Render, Fly.io, and Railway to choose the right JavaScript hosting platform for your framework or container-based app.
A Developer's Guide to JavaScript Custom Events
Create and dispatch JavaScript Custom Events, pass data through the detail payload, and control Shadow DOM propagation with the composed option.
5 Terminal Commands That Make Frontend Work Faster
Five terminal commands including ripgrep, fzf, and fd help frontend developers search codebases, navigate files, and recall build commands faster.
Things to Stop Doing in JavaScript in 2025
Identify outdated JavaScript patterns and replace them with native ESM, modern CSS, Temporal API, and current language features to ship faster, leaner code.
When You Need a Custom Date Picker (and When You Don't)
Compare native HTML date inputs against custom calendar components like React Aria and Radix to choose the right tool for date range selection.
Standard Schema Explained: Flexible Validation Without Lock-In
Standard Schema defines a shared TypeScript interface that lets Zod, Valibot, and ArkType work with any compliant tool without adapter rewrites.
Fixing 'Maximum call stack size exceeded' in JavaScript
Debug stack overflow errors in JavaScript, fix infinite recursion in React and Node.js, and apply iterative solutions to prevent call stack crashes.
Modern CSS Features You No Longer Need JavaScript For
CSS container queries, scroll-driven animations, the Popover API, and the has selector now handle interactive UI patterns without JavaScript.
Building Terminal Interfaces with Node.js
Build Node.js terminal UIs with Ink, neo-blessed, and raw mode primitives to create interactive, keyboard-driven CLI dashboards and real-time displays.