Free online developer tools
Format and validate JSON, encode and decode Base64, read JWTs, test regular expressions, make UUIDs and tidy SQL, in your browser, so your tokens and data never leave your device.
- JSON Formatter and ValidatorNewBeautify or minify JSON, and find mistakes by line and column, explained in plain words. Long numbers, keys and text stay exactly as written, and nothing you paste leaves your browser.
- Base64 Decode and EncodeNewDecode Base64 to text or to the file it holds, and encode text or any file to Base64 or a data: URL. UTF-8, URL-safe Base64 and pictures are handled, and nothing leaves your browser.
- JWT DecoderNewPaste a JWT to read its header, payload and expiry in plain words, and check its signature with a secret or public key. The token never leaves your browser.
- Regex TesterNewType a regular expression and some text to see every match and capture group highlighted as you type, or try a replacement. Patterns that would freeze the page are stopped.
- UUID GeneratorNewGenerate version 4 (random) or version 7 (time-ordered) UUIDs, also called GUIDs, up to 10,000 at a time, in upper or lower case, with or without hyphens. Check any UUID's version and time.
- SQL FormatterNewTurn a long or messy SQL query into neat, indented SQL, with keywords in the case you like. For MySQL, PostgreSQL, SQL Server, Oracle, SQLite, BigQuery and more, right in your browser.