About this tool
JWTViewer is a zero-upload token inspector. Most online decoders send your token to a backend — a real risk, since a live JWT is often a working session credential. Here, decoding happens directly in your browser tab; you can load the page, go offline, and it keeps working.
Timestamps in exp, iat and nbf convert to your local timezone automatically, and the status banner shows at a glance whether the token is valid, expired or not yet active. More free tools at dec0de.dev — Base64, JSON formatter, UUIDs and more.