Practical engineering writing and free developer tools.
CodeSmith pairs hands-on technical articles with fast, browser-based utilities for markdown, env files, social previews, and everyday developer chores.
Popular tools
Fast browser utilities that run on your machine.
Markdown Editor
Free online markdown editor with live preview, local storage, private Markdown and Word DOCX import, and ready-made templates for developers, testers, and product managers.
OpenGraph Preview Tool
Preview how your links appear on Facebook, Twitter/X, LinkedIn, Slack, and WhatsApp. Validate metadata, analyze images, and debug social sharing cards.
.env File Validator
Validate, convert, and generate .env files with type checking, secret detection, and framework presets.
QR Code Generator
Generate QR codes for URLs, text, email, phone, SMS, and WiFi credentials with instant download.
Favicon Generator
Generate professional favicons from text, images, or emojis. Create ICO, PNG, SVG, Apple Touch Icons, and PWA manifest files with live preview.
Service Worker Boilerplate Builder
Generate a production-ready service worker with best practices for caching, offline support, and more.
Latest articles
Practical notes, tutorials, and engineering write-ups.
Advanced Error Handling, Debugging & Security in n8n – Production-Ready Workflows
Master n8n error workflows, retry logic, debugging tools, and security best practices to build resilient automations. Learn how to handle failures gracefully, troubleshoot effectively, and lock down your n8n instance.
TOON vs YAML: Reduce LLM Token Costs & When to Use Each
Discover how TOON (Token-Oriented Object Notation) can reduce LLM token usage by 30–60% compared to YAML, and learn when to use each format for optimal performance and cost efficiency.
The November 18, 2025 Cloudflare Outage: A Deep Dive into the Configuration Cascade That Broke the Internet
On November 18, 2025, Cloudflare experienced its worst outage since 2019: a global infrastructure failure that exposed a critical vulnerability in how modern internet services handle configuration propagation. This deep dive explores the technical breakdown, root causes, and lessons learned.
Work Faster With Markdown and AI: The Ultimate Free Editor for Developers, Testers & Product Managers
Discover how the CodeSmith Markdown Editor streamlines AI-driven documentation workflows with real-time preview, Mermaid diagrams, and local storage. No installation required.
URLPattern API Tester: Match URLs Without Regex
Learn the URLPattern API with an interactive tester for routes, service workers, middleware, and URL matching without fragile regular expressions.
Best JSON Diff & Compare Tools for Developers
Compare the best JSON diff tools for semantic comparison, JSONPath changes, real-time editing, patch export, and privacy-friendly local workflows.
Tool guides
Focused walk-throughs for common tasks.