jwtop

jwtop is a lightweight, open-source command-line utility developed by CerberAuth that streamlines every common operation developers and security engineers perform on JSON Web Tokens. Released in its initial form as version 0.3.1, the tool exposes a single self-contained binary able to decode Base64Url-encoded JWT headers and payloads without external dependencies, verify or invalidate signatures against a supplied secret or public key, create brand-new tokens from custom JSON claims, sign them through HMAC, RSA, or ECDSA algorithms, and even run automated security tests that highlight weak secrets, none/alg=none mis-configurations, and other well-known exploitation vectors. Because all functions are driven from the terminal, jwtop is ideal for rapid debugging of authentication flows in CI pipelines, for crafting synthetic tokens during API integration tests, for educational demonstrations of JWT weaknesses in security workshops, and for red-teamers who need to script token forgery attempts inside larger penetration-testing suites. The program runs natively on Windows, macOS, and Linux, accepts input via arguments, pipes, or files, and returns cleanly formatted JSON that can be consumed by downstream shell scripts or automation frameworks. As the first and currently only release, version 0.3.1 already covers the complete JWT life-cycle while maintaining a minimal memory footprint and zero configuration files. jwtop is available for free on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, always providing the latest build and supporting batch installation alongside other applications.

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