JWT Decoder
Decode JWT headers and payloads in the browser to inspect token claims, expiration times, issuers, and scopes without sending tokens to a server.
How to Use
- Paste your JWT token
- Click Decode JWT
- View the decoded header, payload, and signature
All processing is done in your browser, and files are never sent to a server.
Frequently Asked Questions
A JWT contains three parts: a Header (algorithm and token type), a Payload (claims/data), and a Signature (verification).
This tool decodes and displays the JWT contents but does not verify the cryptographic signature.
Yes, all processing happens locally in your browser. Your token is never sent to any server.