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JWT Decoder

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Decode JWT header and payload locally.

All generated data is fictional and intended for development, testing, QA, prototyping, and automation only. Do not use it for fraud, impersonation, or illegal activity.

Configuration

Output· 13 lines · json
{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "1234567890",
    "name": "John Doe",
    "iat": 1516239022
  },
  "signature": "SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c",
  "note": "Signature is NOT verified — decoding only."
}

About this tool

Decode a JWT's header and payload locally to inspect claims (sub, iat, exp, scopes). Decoding only — the signature is not verified and the token never leaves your browser.

Example output

{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "1234567890",
    "name": "John Doe",
    "iat": 1516239022
  },
  "signature": "SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c",
  "note": "Signature is NOT verified — decoding only."
}

Frequently asked questions

Does it verify the signature?
No — this is a decoder, not a validator. It reads the header and payload without checking the signature.

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Base64 Encode / Decode