JWT Decoder
Paste a JSON Web Token to decode and inspect its header, payload, and expiration status. All decoding happens in your browser.
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About JSON Web Tokens
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. JWTs consist of three parts: a header (algorithm and type), a payload (claims), and a signature.
Common claims include sub (subject), iat (issued at), exp (expiration), and iss (issuer).
Note: This tool decodes the token but does not verify the signature. Signature verification requires the secret or public key.