What to run
Open JWT Decoder. It stays in the browser.
How to read the result
Header names the algorithm.
Payload is JSON claims.
The signature is not checked.
Anyone can forge a payload that decodes. Treat it as a label, not a proof.
What to open next
Open JSON Formatter if you want the payload pretty-printed. It stays in the browser.
Open Unix Timestamp Converter on exp, nbf, and iat. It stays in the browser.