Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 1–12 of 38 posts
Find a single typo in a large file fast: use a word- and character-level diff to pinpoint the one changed character instead of scanning 5,000 lines.
How to compare two Markdown drafts without Word's Track Changes: use a diff checker, git word-diff, or CriticMarkup to see every real edit in plain text.
Learn how to compare two JSON files without key-order and whitespace noise. Normalize first, sort keys with jq, and diff only the changes that matter.
A practical guide to regex find and replace in VS Code: capture groups, $1 substitution, case modifiers, and the side-by-side diff preview.
Learn regex for log parsing: copy-ready patterns to extract timestamps, IPv4 addresses, and HTTP status codes from access logs, with named capture groups.
How to validate phone numbers with regex across country formats: the E.164 pattern that always works, US patterns, and where regex stops working.
Chrome and Firefox can't open HEIC. Here's how to convert HEIC to JPG, PNG, or WebP entirely in your browser — no upload, no app, EXIF under your control.
Use one <picture> tag to serve AVIF, WebP, and JPG so every browser gets the smallest image it can decode. Syntax, fallback order, and the mistakes to avoid in 2026.
How to match a URL with regex and survive the three edge cases that break most patterns: trailing punctuation, balanced parentheses, and scheme-less links.
Batch convert 50 images to WebP, AVIF, JPG, or PNG at once, entirely in your browser — no upload, no sign-up, and your files never leave your device.
Learn how to test a regex pattern online without writing code: paste, highlight, and debug matches, plus why the same regex passes in Python but fails in JS.
Convert any date to a Unix timestamp in Bash, Python, JavaScript, and SQL with copy-paste one-liners — plus the timezone trap each language hides.