React + Flask Authentication Guide

A tutorial demonstrates how to build a React and Flask application with user signup, login, account management, Google social login, passwordless authentication, profile-picture uploads, and optional organization support using PropelAuth. PropelAuth supplies hosted authentication pages and configurable features such as branding, signup metadata, multifactor authentication, transactional emails, and B2B organization management, while the React frontend integrates its SDK through an AuthProvider, user-information wrappers, redirect hooks, and automatically managed access tokens. The frontend sends bearer tokens with authenticated API requests and can use a development proxy to address cross-origin port differences. On the Flask side, the propelauth-flask library initializes authentication using environment-based credentials, protects routes with a require_user decorator, validates JWT access tokens locally after startup configuration, and exposes the authenticated user ID through a request-scoped current_user value.

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