DeveloperFree Tool

JWT Encoder / Decoder

Provided by10015 Tools10015.io

Encodes a JWT from header + payload + secret, and decodes existing JWTs to reveal claims and signature.

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About this tool

Generates JSON Web Tokens (JWTs) by accepting a header, payload, and a secret key from the user. It constructs the token according to standard JWT specifications, allowing developers to test various data structures and signature mechanisms without needing a backend environment. Furthermore, it processes existing JWT strings, decoding them into their component parts—the header, the claims (payload), and verifying the signature structure for inspection purposes. Developers and security students utilize this utility for validating token generation logic and understanding how tokens are structured and secured. It provides a quick way to inspect what data is contained within an encoded token payload or to test different combinations of data points against a known secret.

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