JWT Decoder
Paste any JSON Web Token to see its header and payload as readable JSON — fully offline, nothing ever leaves your browser.
Header
—
Payload
—
Signature
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The signature is not verified. This tool only decodes the token — it does not check who signed it.
How to use
- Paste a JWT (three parts separated by dots) into the box and click Decode.
- Read the pretty-printed header and payload. If the payload contains an exp claim, the token's expiry status is shown.
- Try the sample token button to see how a decoded token looks.
Privacy note: decoding happens 100% in your browser. Never paste production tokens with real secrets into any website — including this one.