Can I authenticate a session in a NodeJS serverless function when I'm using Auth0 Passwordless on my front end?

[dan.woda]

Where is the Auth0 public key to be used in jwt.io to verify the signature of a RS256 token?

We use an Auth0 account. I paste an Auth0-generated token into JSON Web Tokens - jwt.io . It shows me the header and payload but for the VERIFY SIGNATURE section it asks me to paste in a public RSA key or certificate or a private RSA key in order to verify the signature. I can see I have a secret for each client we’ve registered in Auth0. But where I can find, or how can I create, an RSA key or certificate?