Jwt.io does not recognize Auth0 signing certificate for RS256

[simonj]

Ready to post? First, try searching for your answer.
I am trying to manually create a JWT for my Auth0 app using jwt.io with RS256 but I keep getting the error “Invalid signature”. When I pop-open the browser console it appears it only accepts a private key rather than the signing certificate provided by Auth0:

TypeError: “pkcs8” must be PKCS8 formatted string

As I understand it, I can not retrieve a private key for RS256 from Auth0. How can I create a RS256 JWT using jwt.io with the Auth0 provided signing certificate and JWKS URL?

I have tried pasting the string without the “— BEGIN CERT…” but can not get it to work.

Any help would be great

Thanks
Simon

[sumansaurav]

Hi @simonj ,

I am not sure if you can generate Auth0 JWT token. Since you cannot access Auth0 private key. Posting you article on the same.

How do I generate a JWT token?

I need to create a JWT token (RS256) and I tried jwt.io but since the private key isn’t accessible as stated here: If we can not get the private key when use choose RSA256 as JWT signature algorithm Does Auth0 have a straightforward way to just create a JWT token for my payload, instead of building an actual application with SDK integrated for authorization? Thanks!

[simonj]

Thanks @sumansaurav that’s exactly what I needed to know