cd ../tools
public cyber tool / developers / browser-side
JWT Decoder Safe
Paste a JWT and decode header/payload locally. The tool does not verify the signature and does not replace server-side validation.
decode --jwt --local
local analysis / no remote fetch
decode --jwt --local
Important limits
Decoding is not verification: a JWT is trustworthy only when signature, issuer, audience and expiration are validated server-side.
`alg: none`, missing or very long expiration and sensitive claims are signals to fix.
Do not paste production tokens if they contain secrets or unnecessary personal data.
references