From the OpenReplay Blog
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.
Handling Time in Tests: Reliable Patterns for Async and Delays
Fix flaky tests caused by timers and async timing in Jest, Vitest, React Testing Library, Playwright, and Cypress using reliable fake timer patterns.
10 Git Commands Every Developer Should Know
Ten essential Git commands including git switch, git restore, and git reflog explained so developers can manage daily workflows with confidence.
Smarter Caching in Next.js: Partial Rendering and Reusable Components
Next.js App Router caching across Data Cache, Full Route Cache, and Partial Prerendering becomes predictable when server components own their caching policy.
Automating Repetitive Tasks with Cron Jobs
Schedule scripts with cron jobs using correct syntax, absolute paths, logging, and overlap prevention, plus guidance on systemd timers and Kubernetes CronJobs.
Tips and Tricks for Debugging GitHub Actions
Fix failing CI/CD pipelines by enabling debug logging, validating workflows with actionlint, testing locally with nektos/act, and scoping artifacts correctly.
JavaScript Pitfalls: Five Issues You'll See Again and Again
Avoid JavaScript pitfalls like type coercion, this binding, hoisting, async misuse, and accidental mutation by recognizing patterns that break production code.
Running High-Performance Code with WASM
WebAssembly 3.0 brings GC, threads, Memory64, and SIMD to browsers. See how to structure WASM modules for high-performance frontend computation hotspots.
Comparing Electron and Tauri for Desktop Applications
Compare Electron and Tauri across performance, security, and bundle size to choose the right cross-platform desktop app framework for your next project.
Top 5 Image Placeholder Services for Web Developers
Compare five CDN-backed image placeholder services, including Placehold.co, Lorem Picsum, and DiceBear, to pick the right tool for modern frontend workflows.
Meet the JavaScript Engines Powering the Web
Compare V8, SpiderMonkey, JavaScriptCore, and Hermes to see how JavaScript engines parse, compile, and optimize code across browsers and runtimes.
Fixing 'Unexpected token < in JSON at position 0'
Fix the unexpected token < JSON parse error by diagnosing HTML responses caused by wrong URLs, auth redirects, or server errors in fetch and Next.js APIs.