React Router v7 authorization: A developer's guide for 2026

The text outlines the intricacies of implementing secure authorization in React Router v7, focusing on the need to differentiate between authentication ("who is this user?") and authorization ("what can this user do?"). It highlights common pitfalls, such as protecting routes with loaders but neglecting to secure actions, which are HTTP endpoints accessible directly through URLs. The document describes how roles and permissions can be modeled using flat roles or permission-based role-based access control (RBAC), with the latter offering greater flexibility for complex applications. It emphasizes the importance of enforcing authorization checks within actions and provides code examples for building reusable helpers to propagate authorization context throughout an application. The text also covers advanced authorization patterns for business-to-business (B2B) applications, including organization-scoped roles and resource ownership, and introduces WorkOS as a solution for managing RBAC and fine-grained authorization efficiently. The guide concludes by recommending best practices for naming permissions, logging denials, and ensuring comprehensive testing of authorization logic.

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