JWT Decoder & Debugger
Decode and inspect JWT tokens locally. View header and payload as formatted JSON. No server—tokens never leave your device.
Your files are 100% safe. Processing is done in your browser; nothing is uploaded to any server.
How to use this tool & why it helps
JWT has 3 parts separated by dots; each part is Base64Url. This tool decodes header and payload in your browser so the token never leaves your device—safe for production tokens.
Never paste real JWTs into server-side or untrusted sites. Use this client-side tool only.