JWT Decoder
Decode and inspect JWTs in your browser. Edit claims, verify HMAC signatures — nothing is uploaded.
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Edit the token or JSON — both stay in sync locally.
Nothing leaves this device. No account required.
Decode JWTs locally
Paste a JSON Web Token on the left to see its header and payload as editable JSON. Claims stay on this device — decoding does not upload the token. Add an HMAC secret below to verify HS256, HS384, or HS512 signatures.
Need to build a token from claims instead? Use the JWT Encoder.