JWT Decoder
Decode JSON Web Tokens to inspect the header and payload claims.
Encoded Token
Decoded Data
Unlocking the secrets of JSON Web Tokens (JWT)
JWT (JSON Web Token) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between a client and a server as a JSON object. It is mostly used for Authentication and Authorization systems across the modern web.
A typical JWT consists of three parts: a Header, a Payload (the claims/data), and a Signature. Our JWT Decoder tool easily breaks down and decodes the Header and Payload sections instantly. If you need to format the resulting JSON further, you can use our JSON Formatter.
Frequently Asked Questions
The payload in a JWT is not encrypted, it is only Base64Url encoded. This means anyone with the token can decode and read it. The golden rule is to never put sensitive data (like passwords) inside a JWT payload! The security of a JWT comes from its Signature, which guarantees that the payload has not been tampered with.