JWT Debugger
Paste a JSON Web Token to read its header and payload, with issued-at and expiry decoded to dates. Nothing is verified or sent anywhere.
Good to know
- The signature is not checked: this is a decoder, not a validator. Never paste production secrets into any online tool, including this one.
Common questions
Does it verify the signature?
No. It only decodes the token. Never treat the decoded claims as trusted without verifying the signature server-side.
Why does my token look expired?
Check the exp claim against the current time; clock skew between machines is a common cause of rejected tokens.
Is it safe to paste production tokens?
Prefer test tokens. Decoding happens locally, but a token is still a credential once it leaves your clipboard.
Is this tool really free?
Yes. There is no account, no paywall and no usage limit. Tools App is funded by aumenso, the studio behind it.
Is anything I enter uploaded?
No. The tool runs in your browser tab; what you enter is never sent to us and never stored.
Need this built for your business?
aumenso builds websites, branding, SEO, GoHighLevel funnels and custom software for agencies and businesses across North America and Europe. These tools are the same team's work, given away free.