🔒 100% Client-Side Sandbox • Zero Server Telemetry

JWT (JSON Web Token) Debugger

Decode and inspect JWT headers and payload claims securely inside your browser's local RAM.

Encoded JWT String

Decoded Header

Decoded Payload Claims

Secure Client-Side Token Inspection

JSON Web Tokens contain user IDs, permissions, and expiration timestamps. Never paste production JWT tokens into unverified online debuggers that log server requests. This tool parses token base64url segments 100% locally.