Free, privacy-first
JWT Decoder & Validator
Decode JWT structure, inspect claims, and validate expiry, issuer, and audience rules with no server upload.
Input values
Results
Results update as you use the interface above.
Why this matters
JWT debugging without the right tools is tedious and error-prone: manually base64-decoding headers and payloads, mentally converting Unix timestamps to dates, checking algorithm fields by hand. The structural issues that break auth flows: an expired exp claim, a missing iss or aud field, a mismatch between the algorithm in the header and what your service expects: are easy to miss in raw token form but immediately obvious when the payload is decoded cleanly. Use this to diagnose token problems in development, verify claims before integration testing, and understand what any given token contains without standing up a full auth debugger.