Decode JWE's access token

[kito.hirokazu]

I am implementing the decoding of access tokens with scratch.
access token’s header indicates a common key as following
{
“alg”: “dir”,
“enc”: “A256GCM”,
“iss”: “XXX”
}

In that case, I need common key which can decodes JWE,but there are no common key in the Auth0 dashboard. I think JWKS Endpoint cannot be used this time because it is a public key.
Where is the commonkey

[tyf]

Hey there @kito.hirokazu welcome to the community!

@kito.hirokazu

{
“alg”: “dir”,
“enc”: “A256GCM”,
“iss”: “XXX”
}

This looks like an opaque access token - If you need to decode it at all, you’ll need to include an audience param when constructing the /authorize request. It depends on how you are initiating authorization, but the audience is typically set when configuring Auth0 - For example AuthorizationParams in auth0-react.

The following FAQs should be of use:

Why is my access token not a JWT? (Opaque Token)

Question: Why is my access token not a JWT? (Opaque Token) Answer: An access token will be issued in one of the following formats: JSON Web Token (JWT) : Tokens that conform to the JSON Web Token standard and contain information about an entity in the form of claims. They are self-contained in that it is not necessary for the recipient to call a server to validate the token. Access Tokens issued for the Auth0 Management API and Access Tokens issued for any custom API that you have registere…

What is the Audience?

Question: What is the Audience? Answer: The audience parameter exists as part of the OAuth2.0 protocol. You can read more information from the specification here. What is it? The audience (presented as the aud claim in the access token) defines the intended consumer of the token. This is typically the resource server (API, in the dashboard) that a client (Application) would like to access. It can be added to the request to authorize i.e. audience: 'https://test-api' Here is an example where …

[kito.hirokazu]

Thank you for your help.
I input Audience and I can get correct Token!!