JWT Decoder and Debugger
Inspect JWT headers, payloads and signatures, then verify or generate tokens using an HMAC secret locally in your browser.
Processed locally in your browser; data is not uploaded
Features
- Decode JWT header and payload
- Inspect claims and timestamps
- HS256/HS384/HS512 verification
- JWT generation
- Local browser processing
FAQ
Are JWTs uploaded?
No. Decoding, verification and generation run locally with browser APIs.
Does decoding prove a token is valid?
No. Decoding only reads its contents; verify the signature with the correct secret to confirm integrity.
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