JWT Decoder
Decode JSON Web Tokens and view payload data.
JWT Debugger: Decode & Verify JSON Web Tokens
An essential tool for web developers to inspect JWT headers, payloads, and signatures ensuring correct authentication flows.
How to use the JWT Decoder:
- Paste your Base64 encoded JWT string.
- View the decoded Header (algorithm) and Payload (claims) instantly.
- Verify the token format and integrity without sending secret data to a server.
What is inside a JWT?
JSON Web Tokens contain three parts: a header, a data payload (claims like user ID, expiration), and a signature. Our tool breaks these down into readable JSON, allowing you to debug login issues, check expiration times ('exp'), or verify user roles ('scopes') client-side.