nodejs tools

JWT Decoder & Inspector

Paste a JSON Web Token to decode the header and payload (Base64URL). Does not verify the signature — never trust claims until your server validates the token.

Created by

Oleksandr K.

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JWT string

Decoded (header + payload)

{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "1234567890",
    "name": "John Doe",
    "iat": 1516239022
  },
  "signature": {
    "length": 43,
    "preview": "SflKxwRJSMeKKF2QT4fwpMeJ…"
  },
  "disclaimer": "Signature is not verified. Only use decoded claims after verify() on the server."
}

Decoding is client-side only. Never treat payload claims as trusted until the signature is verified with your secret or public key on the server.

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