JWT Debugger

Decode and inspect JSON Web Tokens (JWT) headers and payloads without verifying signatures.

JWT Input
ENCODED0 chars

Paste a JWT to decode

Results will appear here

# JWT Debugger & Decoder

JSON Web Tokens (JWT) are the industry standard for secure authentication (RFC 7519). A JWT consists of three parts: Header, Payload, and Signature.

Use this debugger to:

  • Decode Payloads: View the claims (data) inside your token, such as User ID (`sub`), Roles, and Expiration (`exp`).
  • Visualize Structure: See color-coded sections to distinguish between the algorithm, data, and digital signature.
  • Debug Issues: Quickly verify if a token is malformed or expired.

Security Note: This tool decodes tokens purely on your device. We do not store, log, or transmit your tokens.