JWT Decoder

Decode JWT (JSON Web Token) to inspect headers and payload claims without signature verification.

Security Warning

This tool only decodes JWT tokens without signature verification. Do not use this for validating tokens in production applications. Always verify signatures on the server side.

A JWT (JSON Web Token) consists of three Base64-encoded parts: header, payload, and signature. The header contains metadata about the token, while the payload contains claims (data). Common claims include 'exp' (expiration), 'iat' (issued at), and 'nbf' (not before).
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