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.
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.
Debug local log files with Grafana and Loki
Loki with Grafana's UI is very useful in grepping and debugging big log files. Specially when you have multiple instances of a micro-service running, each generating their own log files.
Removing permanent redirects from next config
If you have been working with multiple Next.js web apps, and even if one of them has a permanent redirect set in next.config.js then your browser will cache it forever.
Interview Question: Are two strings anagrams?
A common programming interview question about checking if two strings are anagrams of each other. Let's explore different approaches to solve this problem.
Android Studio 2.0 crashes on Windows
Google recently launched Android Studio 2.0 with exciting new features, but we encountered crashes on startup. Here's how to fix the JDK_HOME environment variable issue.
Tool guides
Focused walk-throughs for common tasks.