SmartActions.

JWT Decoder

Inspect JWT header, payload, signature and expiry locally. Tokens never leave your device.

5 credits / successful runRuns on your deviceSign-in to runResult not retained

Your token is decoded only on this device and is never sent to any server. Signature verification is not performed. Each successful action uses 5 credits. New accounts receive administrator-configured starter credits. Input is cleared on sign-in or leaving this page.

Input

Local processing

Up to 64 KB. Header and payload must be JSON objects. Times are shown in UTC. Decoding does not establish authenticity.

Result

Ready when you are.

Preview a built-in sample for free. Your result appears after credit settlement is confirmed.

Results are not saved. Download before leaving. Copy, download and switching views are free.

Your content stays in your browser. Only execution authorization and credit activity are sent to our service. Results are not saved and cannot be restored after leaving this page.

WHAT YOU’LL GET

Your data.
Your device.

JWT Decoder, made simple.

Readable header and payload, signature bytes and UTC claim times. Expired tokens are highlighted. Signature verification is not performed.

Each successful action costs 5 credits. Fixed sample previews are free. Copying, downloading and switching result views are free. Input and results stay in memory and are cleared when you leave.

WHEN TO USE IT

What people use JWT Decoder for.

Debug an auth problem

See which claims a token actually carries when a request is rejected.

Check an expiry

Read the expiry and issued-at claims as readable UTC times.

Inspect a token safely

Decode it locally, so a token that grants real access never leaves your machine.

How to use JWT Decoder

  1. Paste the JWT into the input box.
  2. Read the decoded header and payload, with expired tokens highlighted.
  3. Check the signature bytes if you need them.
  4. Note that the signature is not verified — this tool decodes, it does not authenticate.
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A FEW THINGS TO KNOW

Questions? We’ve got answers.

Does my content leave this device?

No. Content is processed locally in a browser worker. Only execution authorization and credit activity reach our service.

How much does it cost?

Each successful action costs 5 credits. Fixed sample previews, copying, downloading and view changes are free.

Can I restore results?

No. History retains status and credit activity only. Download results before leaving. Failed or cancelled runs release reserved credits; interrupted connections can be checked using the original run.