Developers
Format JSON, decode a token, test a regex, read a cron line — the small checks that interrupt real work.
- JSON formatterFormat, validate and minify JSON, with the exact error position.
- Base64 encoderEncode and decode Base64 text, or turn a file into a data URI.
- URL encoderEncode and decode URL components and break a URL into parts.
- JWT decoderRead the header and payload of a JSON Web Token and its expiry.
- Regex testerTest regular expressions with live highlighting and groups.
- Cron expression helperExplains a cron schedule in plain English and shows the next runs.
- Hash generatorMD5, SHA-1, SHA-256 and SHA-512 of text or files.
- UUID generatorRandom v4 or time-ordered v7 UUIDs, one or a thousand at once.
Developers: what to know
None of these need a project, an install or a login. Paste the value, read the answer, go back to what you were doing.
The JSON formatter points at the exact position of a syntax error, the JWT decoder shows the payload and expiry without sending secrets anywhere, and the cron helper explains a schedule in plain words and lists the next runs.
How to choose
- Never paste a production token or secret into any online tool, including this one — use a test or expired value.
- Build a regex against real sample data, not an idealised example.
- Hash the file itself, not its name, when you need to prove two copies are identical.