Developer Tools

These are the utilities developers open in a spare tab: validate a payload, decode a token, turn a Unix timestamp into something readable, check a regular expression against real input. Running them in the browser is not only faster than a round trip to a server, it is also the only responsible way to handle a token or a production payload, because nothing you paste is transmitted.

Data formats

The JSON formatter pretty-prints and validates, naming the line and character of a syntax error rather than failing silently. Conversions between JSON and CSV, JSON and XML, CSV and JSON and YAML and JSON each have their own page and keep nested structures intact.

Tokens, time and identity

The JWT decoder shows the header, claims and expiry of a token without verifying it against a secret, which it says clearly. The timestamp converter and live Unix timestamp cover epoch work, and the UUID generator, hash generator and SHA-256 generator use the browser's own crypto APIs.

URLs and patterns

The URL parser breaks an address into its parts including every query parameter, and the regex tester highlights matches and capture groups as you type, with the common flags and an explanation of what the pattern does.