Access_token too short ~ jwt malformed

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There are two sections to look into in this flow, the SPA and the API. When you make a request to the /authorize endpoint and you use an audience like https://YOUR_DOMAIN.auth0.com/userinfo with a response_type='token id_token' you’re asking Auth0 to provide you with an access_token that will have the /userinfo audience and with an id_token that has some information about the user.

When you use YOUR_DOMAIN.auth0.com/userinfo as an audience parameter, you get a short access token (like the one you received) that is not designed to call your own API, as @priya.sharma.9362 said. It’s only meant to be used to call Auth0’s userinfo endpoint. If you want an access_token that can be verified and consumed by your API you need to do the following:

  • Create an API in Auth0 as explained in this document. The API identifier will be audience that we will use later. It’s highly recommended that you use RS256 as a signing algorithm
  • Use the identifier of the API you created as the audience parameter in the request to /authorize either manually or through auth0.WebAuth({}). Use response_type='token id_token to get both an access and an id token back.
  • Verify that you get back an access_token with the proper audience. You can use jwt.io to inspect it.
  • Make a request to your API with this access_token as part of the Authorization header ( Authorization: Bearer <access_token> )
  • Verify your access_token in your API. This process is explained in this document in greater detail. In particular, you should verify the audience ( aud claim), the issuer ( iss ), the algorithm should be RS256 and you should use https://YOUR_DOMAIN.auth0.com/.well-known/jwks.json to get the proper keys. You may also need to check the scopes depending on your use case.
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