Tools
The toolbox
Small, sharp developer tools — built from scratch in vanilla TypeScript, free, no sign-up, and everything runs right here in your browser. Nothing you type is uploaded.
Regex Checker
Developer tool
Test regular expressions with live match highlighting, capture groups, named groups and a replace preview. JavaScript flavour, with a full quick-reference — everything runs in your browser.
Open Regex Checker →JSON Formatter
Developer tool
Format, validate and minify JSON with exact line-and-column error messages, sorted keys, and your choice of indentation. Everything runs in your browser — nothing is uploaded.
Open JSON Formatter →What are these?
Utilities I wanted myself, built properly: each tool is written from scratch in this site's codebase with a pure, unit-tested core and no frameworks or external services. They work offline once loaded, store settings on your device only, and never upload what you type — no accounts, no tracking beyond the site's ads. More tools are on the way; if there's one you'd like to see, tell me.