Decode header, payload & signature, and validate JWT structure.
Runs entirely in your browser — nothing is uploaded.
Decoding updates in real time as you type.
{ "alg": "HS256", "typ": "JWT" }
{ "sub": "1234567890", "name": "John Doe", "role": "admin", "iat": 1516239022 }
SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5cThe signature can't be verified in the browser without the secret or public key — this tool decodes and inspects structure only.
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