JWT Decoder - Inspect JSON Web Tokens
Decode JWT tokens and inspect header, payload, and expiration claims.
Processed 100% locally in your browser. Tokens never leave your device.
JWT Token Decoder
// Header payload will render here
// Claims payload will render here
Note: Decoding a JWT parses and displays the header and payload claims. It does not verify the token's cryptographic signature.
Acerca de JWT Decoder - Inspect JSON Web Tokens
Splits JWT strings into header.payload.signature parts and Base64-decodes each segment for inspection.
How to Decode JSON Web Tokens
1. Paste an encoded JWT string (header.payload.signature).
2. The decoder splits and parses the Base64URL header and payload claims.
3. Inspect expiration timestamps (exp), issuer (iss), subject (sub), and custom claims.
Ejemplos de uso
Decoding JWT Payload Claims
Input: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkFsaWNlIiwiaWF0IjoxNTE2MjM5MDIyfQ... Decoded Payload: { "sub": "1234567890", "name": "Alice", "iat": 1516239022 }
Preguntas frecuentes
Does this tool verify the JWT signature key?
This tool decodes and displays token headers and payload claims client-side for debugging. Signature verification requires your private secret key.
Is my auth token safe?
Yes. Token decoding occurs 100% locally in your browser. Tokens are never sent to external servers.