All you have to do is be sure you have the latest rust version installed and then you can simply run
./jwtgen.sh
You will find you generated token inside a newly created jwt.txt file.
To get the pem generated keys, go into the /src/pem folder and use the public key to decode the new JWT
Typically you want to include the pem file as bytes in your JWT validation script
I use it in my rust projects where I need a JWT and it makes the dev process way easier for me