About this JWT viewer
JWTViewer is a zero-upload token inspector. Most online decoders send your token to a backend to
parse it — a real risk, since a live JWT is often a working session credential. Here, decoding uses
atob and JSON.parse directly in your browser tab; you can even load the page,
disconnect from the internet, and it keeps working.
Timestamps in exp, iat and nbf are converted to your local
timezone automatically, and the status banner tells you at a glance whether the token is still valid,
expired, or not yet active. Need more tools? Try the
dec0de.dev toolbox — Base64, JSON formatter, UUIDs and more.