If you're looking for a way to analyze JWTs without using online tools, jwt-encde might be helpful.

It is a dedicated GUI app that brings JWT decoding and encoding to your local desktop. The first stable version was released today, built with Rust and iced.

Why and when jwt-encde ?

• 100% Offline: Total privacy and information security. No logs, no tracking, no leaks.
• Robust Design. Simple & Intuitive: Just a clean, high-performance and error-prevention UI ensures you focus on what's relevant to your current data.
• Smart Analysis: Includes JSON syntax highlighting and a built-in Unix timestamp converter to make debugging easier.

And NOT when:

• It doesn't support signature verification, as typically handled during integration tests with an IDaaS.

Available for Windows, macOS, and Linux: https://github.com/nabbisen/jwt-encde