React + Express Authentication Guide

A tutorial demonstrates how to build a React and Express application with user signup, login, account management, Google social login, passwordless authentication, two-factor authentication, and profile-picture uploads through PropelAuth. PropelAuth supplies hosted, customizable authentication and account pages, optional organization features, transactional emails, and configuration for signup metadata and identity providers. On the React side, the application installs the PropelAuth library, wraps the app in an AuthProvider, uses injected authentication data such as the user profile and access token, provides login, signup, account, and logout redirects, and sends bearer tokens with authenticated backend requests. The guide also addresses local development CORS by configuring a proxy between React and Express. On the Express side, it creates a basic API route and then protects it with PropelAuth middleware that validates JWT access tokens, returns unauthorized errors when appropriate, and exposes the authenticated user through the request object, allowing applications to associate backend data with individual user IDs.

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