From the OpenReplay Blog
How to Center Anything with Modern CSS
Center any element horizontally or vertically using CSS Flexbox, Grid, and auto margins by matching the right method to each layout context.
Building Terminal UIs with Charm
Build terminal UIs in Go using Bubble Tea, Lip Gloss, and Bubbles from the Charm ecosystem with composable Model, Update, View architecture.
AI Prompting Tips for Developers
Build reliable LLM integrations by applying structured outputs, few-shot prompting, and context engineering to make AI responses predictable in production.
Postgres Best Practices for Modern Web Apps
Improve PostgreSQL schema design, indexing strategies, connection pooling with PgBouncer, and safe migrations to build web apps that perform well in production.
How to Inspect and Edit Cookies in Chrome DevTools
Inspect, edit, and delete cookies in Chrome DevTools using the Application panel, Network panel headers, and cookie fields like HttpOnly, Secure, and SameSite.
How to Stream Data to the Browser with Fetch
Stream Fetch API responses incrementally using ReadableStream, TextDecoder, and AbortController to display progressive data before the full payload arrives.
5 Mobile Web Papercuts (and How to Fix Them)
Fix common mobile bugs using CSS viewport units, safe area variables, overscroll behavior, and proper touch target sizing for real device results.
Mocking API Calls in Vue Tests with Vitest
Two practical strategies for mocking API calls in Vue tests with Vitest are covered: module-level mocking and HTTP-layer interception using Mock Service Worker.
JavaScript Features You Should Be Using in 2026
Modern JavaScript features like Set methods, iterator helpers, array grouping, and Promise.try are stable and ready to simplify your production code today.
Access Local Web Apps Securely with Tailscale
Share local web apps securely with Tailscale Serve and Funnel across devices, without port forwarding, firewall rules, or unstable ngrok tunnels.
Run AI Models Directly in the Browser with Transformers.js
Run AI models directly in the browser using Transformers.js, ONNX Runtime, and WebAssembly for private, offline, low-latency inference without a backend server.
A Quick Introduction to RAG for Web Apps
RAG grounds LLM responses in your own data using vector embeddings, retrieval pipelines, and tools like LangChain, LlamaIndex, and pgvector for web apps.
The Interop Project Explained
The Interop Project coordinates browser vendors to fix cross-browser CSS and JavaScript inconsistencies using Web Platform Tests and shared focus areas.
Scan Your React Code for Anti-Patterns with React Doctor
React Doctor scans React codebases for prop drilling, dead code, and accessibility gaps, producing an actionable 0 to 100 code health score via CLI.
Claude Code Skills for Frontend Workflows
Build Claude Code skills to automate frontend workflows, enforce design system rules, and scaffold components with slash commands and structured instructions.
A Quick Guide to the Invoker Commands API
The Invoker Commands API lets you wire buttons to dialogs and popovers declaratively using commandfor and command attributes without extra JavaScript.
From Idea to App: 5 Next.js SaaS Starters
Compare five Next.js SaaS starters covering authentication, Stripe billing, and database setup to choose the right boilerplate for your next product.
Parsing Markdown Natively with Bun
Bun includes a native Markdown parser that converts Markdown to HTML, React elements, or custom output without extra packages or plugin configuration.
Importing JSON in ES Modules (No Fetch, No Bundler)
Import JSON in ES modules using native import attributes syntax, no fetch and no bundler required, across modern browsers and current Node.js releases.
A Beginner's Guide to Google's Antigravity IDE
Google Antigravity IDE uses autonomous agents to plan, write, and verify code across files. This breakdown covers Agent Manager, Artifacts, and Planning mode.
Getting Started with Game Development from Scratch
Compare Unity, Godot, Phaser, and Unreal Engine, then build a small complete game using the game loop, collision detection, and core object state concepts.
Safer ENV Vars for Web Apps With Varlock
Varlock brings schema-driven ENV validation to JavaScript apps, catching missing secrets early and preventing leaks in Astro, Vite, and Next.js builds.
npm Security Best Practices
Reduce npm supply chain risk by disabling post-install scripts, locking dependencies, enabling WebAuthn 2FA, and publishing via OIDC trusted publishing.
Testing Your Site Without JavaScript: What and Why
Test your site without JavaScript using Chrome DevTools to expose fragile HTML foundations and apply progressive enhancement with Next.js, Remix, or Astro.