Auth0 provides two JWT libraries, one for Node: node-jsonwebtoken, and one for Java: java-jwt.
I created the private/public key pair, and used it successfully in Node with node-jsonwebtoken:
var key = fs.readFileSync('private.key');
var pem = fs.readFileSync('public.pem');
var header = {...};
var payload = {...};
header.algorithm = "RS256";
var message = jsonwebtoken.sign(payload, key, header);
var decoded = jsonwebtoken.verify(message, pem, {algorithm: "RS256"});
But I found no way of doing the same in Java with java-jwt.
Anyone has a working example of how to use private/public keys for JWT in Java?
That particular library doesn't support it. But you can check others for Java that do. See here: https://jwt.io/