Developer
Formatting and inspection tools for people who work with code and APIs. A JWT is only decoded so you can read the payload. The signature is not checked, and the token is not sent anywhere.
JSON formatter
Pretty-print or minify JSON and see the parse error if it is invalid.
URL encoder
Encode or decode a string for use in a query parameter.
JWT decoder
Read the header and payload of a JSON Web Token locally.
Hash generator
Compute SHA-256 or SHA-1 of text in the browser.
Regex tester
Try a JavaScript regular expression and list the matches.