JWT Decoder
Decode JSON Web Tokens to inspect the header, payload, and signature. Check expiration and view standard claims.
Decode JSON Web Tokens to inspect the header, payload, and signature. Check expiration and view standard claims.
A JWT is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts separated by dots: a header (algorithm and token type), a payload (claims/data), and a signature for verification.
This tool decodes JWTs entirely in your browser — the token is never sent to any server. However, remember that JWT payloads are only Base64-encoded, not encrypted, so anyone with the token can read its contents. Never share JWTs containing sensitive data.
Paste your JWT into the decoder and it will automatically check the "exp" (expiration) claim in the payload. The tool displays whether the token is currently valid or expired, along with the exact expiration date and time.