Building Authentication & Authorization in a Full-stack React + Express.js App with Auth0 (opens in new tab)

Authentication and authorization are two of the most important features in modern web applications. Authentication answers the question: "Who are you?" Authorization answers the question: "What are you allowed to access?" In this tutorial, we'll explore the requirements to build a React frontend and an Express.js backend secured with Auth0. By the end, users will understand how to log in through Auth0, obtain access tokens, and access protected API routes securely. Explored Themes We'll explo...