JSON Formatter & Validator
Pretty-print it, minify it, find the broken bracket.
Tools
Small things I needed often enough to build properly. No sign-up, no ads, and each one is a public API as well as a page.
JSON to TypeScript, Pydantic & Go
Turn a response body into types you can compile.
JWT Decoder
Read the header, the claims and the expiry.
Cron Expression Explainer
What it means, and when it next fires.
Hash & HMAC Generator
MD5, SHA-1, SHA-2, SHA-3 and BLAKE2 — plus HMAC.
UUID, ULID & Nano ID Generator
v4, v7, ULID, Nano ID, ObjectId — up to 500 at once.
IBAN Validator
Checksum, length and country — 88 of them.