runs locally in your browser
Regex Tester
Test and debug JavaScript regular expressions with live highlighting, match list and capture groups.
more developer utilities
JSON Formatter & Validator
Beautify, minify and validate JSON with clear error messages.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text (UTF-8 safe).
URL Encode / Decode
Percent-encode or decode URLs and query strings.
JWT Decoder
Decode JSON Web Tokens and inspect header, payload and expiry.