Developer Tools
A curated collection of the best format code, test regex, validate JSON, and speed up your workflow.
Developer utilities are the ones you reach for several times a day: formatting and validating JSON, testing a regular expression, decoding a JWT, comparing two files, encoding and decoding Base64 or URLs, or working out what a cron expression actually means.
The main thing to check is whether the tool processes data locally in your browser. Pasting a production token, API response, or customer record into a page that sends it to a server is a genuine security risk, and the safest tools say plainly that nothing leaves your machine. Beyond that, look for clear error messages that point at the exact line or character that broke.