JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and verify structure.
What is a JSON Web Token (JWT)?
A JSON Web Token (JWT) is a compact, URL-safe token format defined in RFC 7519, widely used for authentication and information exchange between systems. A JWT consists of three Base64URL-encoded parts separated by dots: the Header (specifying the algorithm and token type), the Payload (containing claims like user ID, roles, and expiration time), and the Signature (which verifies the token hasn't been tampered with). JWTs are commonly used in OAuth 2.0 flows, single sign-on (SSO) systems, and stateless API authentication.
How to Use This JWT Decoder
Paste your JWT token into the input field. The tool accepts tokens from authorization headers, cookies, or any source.
The header and payload are instantly decoded and displayed with syntax-highlighted JSON, showing all claims.
Check standard claims like iss (issuer), exp (expiration), sub (subject), and iat (issued at) with human-readable timestamps.