Nuxt, a Vue-powered framework, is adept at handling authentication but requires additional logic for structured authorization, which determines user permissions. The blog post explains how to implement fine-grained authorization in a Nuxt.js application using Attribute-Based Access Control (ABAC) and Relationship-Based Access Control (ReBAC) by integrating Permit.io. This approach involves defining access control policies outside the codebase, allowing for scalable and flexible access management. Using a sample food delivery app, the tutorial demonstrates how to set up roles, actions, and resources, sync app data, and enforce policies through Nuxt middleware. The process includes defining user and resource attributes, creating instance roles, and using the Permit.io SDK to manage permissions dynamically. By combining ABAC, ReBAC, and Role-Based Access Control (RBAC), the guide showcases a comprehensive method for managing access in applications while maintaining clean code and enhancing security.