JWT Decoder

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties. JWT consists of three parts: Header, Payload, and Signature.

JWT Structure:

Header.Payload.Signature

// Example
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ
.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Standard Claims

Standard Claims:

• iss - Issuer
• sub - Subject
• aud - Audience
• exp - Expiration Time
• nbf - Not Before
• iat - Issued At
• jti - JWT ID

Security Tips

Security Notes:

• Do not store sensitive information in JWT. Payload can be decoded by anyone.
• Always verify the signature to ensure the token has not been tampered with.
• Check expiration time and reject expired tokens.
• Use HTTPS to prevent token interception.
• Do not store tokens in localStorage. Use httpOnly cookies.