JWT Decoder

Decode a JSON Web Token to see its header and payload. Runs entirely in your browser — your token is never sent anywhere. Decode only (no signature verification).

Input

Output

🔒 Everything runs in your browser. Nothing is uploaded.

Examples

eyJhbGciOiJIUzI1Ni… → { "header": { "alg": "HS256", "typ": "JWT" }, "payload": { "sub": "1234567890", "name": "John Doe", "iat": 1516239022 } } decode

How it works

Available operations: decode.

Everything runs locally with the same code that passes our automated correctness tests — no server, no upload.