JWT Debugger

Decode and encode JSON Web Tokens

Encoded Token

JWT Token

Valid JWT format

Decoded Token

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}

Signature

SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Token Encoder

Create a new JWT token from header and payload

Header (Algorithm & Token Type)

Payload (Claims)

Algorithm

Signing Algorithm

Secret Key (for signature)

Secret

Note: This tool uses the Web Crypto API for HMAC signing with real cryptographic algorithms. Tokens are generated client-side only - your secret keys never leave your browser.