Developer tools that stay on your machine

These utilities run on every keystroke, in your browser, with no server round trip. That makes them fast, and it means a JWT, a hash input or a config you paste here is never transmitted anywhere.

• JSON Formatter Paste JSON, get it indented, minified or validated instantly. Your data stays on this page. • Regex Tester Type a pattern, paste some text, and see every match and capture group as you go. • JWT Decoder Paste a JSON Web Token and read its header and claims. The token never leaves your browser. • Cron Parser Turn 0 */6 * * 1-5 into a sentence and a list of upcoming run dates. • Base64 Convert text to Base64 and back, with correct UTF-8 handling and an optional URL-safe alphabet. • Hash Generator Get the MD5, SHA-1 or SHA-2 digest of any text, computed on your device. • UUID Generator Create UUID v4 or v7 identifiers in bulk, generated on your device with a secure random source. • Timestamp Converter Paste an epoch value or a date and see it in UTC, local time and ISO 8601.