Using Auth0 ID to retrieve and update user info from MySQL

I created a ReactJS web app with a “user profile” page where the logged user can save: name, surname, email and address. For the moment, every time I log-in and save the data a new object is created.

I would like each logged user to be linked to a single ID, namely Auth0 one, so that I can always retrieve and update the row of the right user in my MySQL database.

I read this Guide

But when I click the buttons to retrieve messages in the API I get:
Access to fetch at ‘http://localhost:8080/api/messages/protected-message’ from origin ‘http://localhost:3000’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.

Answered here:

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