100% PRIVATE • NOTHING SENT OVER THE NETWORK • CLIENT-SIDE DECODER

JWT Decoder & Token Debugger

Paste a JSON Web Token to instantly see its structure: the header, the payload, the claims (permissions) and the token’s expiration status (exp).

Sample tokens:
✓ Token decoded successfully
Expires: —
HEADER: Algorithm & Type 
{
  "alg": "HS256",
  "typ": "JWT"
}
PAYLOAD: Data (Claims) 
{}
SIGNATURE: Token signature 
// Paste a token to show the signature
🛡️
Your data stays private and secure JWTs are decoded 100% inside your browser using standard JavaScript functions, with no requests to external servers. Your tokens, keys and secrets never leave your device. Note: this tool decodes tokens but does not verify signatures.
🛠️

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