What is Authorization? Definition & Meaning

Authorization determines what an authenticated user is allowed to do within your application. While authentication verifies identity ('Who are you?'), authorization controls access ('What can you do?'). It ensures regular users can't access admin panels, free users can't use premium features, and users can only edit their own data.

Authentication gets users in the door. Authorization decides which rooms they can enter.

Authorization Patterns

Role-Based Access Control (RBAC)

Users have roles, roles have permissions:

Role	Can View	Can Edit	Can Delete	Can Admin
User	Own data	Own data	Own data	No
Editor	All content	All content	Own content	No
Admin	Everything	Everything	Everything	Yes

Resource-Based

Users can only access resources they own:

Users edit their own profile
Users see their own orders
Users delete their own comments

Where Authorization Lives

Authorization checks happen in multiple places:

API routes — Check permissions before processing requests
Middleware — Block unauthorized requests before they reach handlers
UI — Hide buttons and pages users can't access
Database queries — Filter results to only include authorized data

Common Authorization Mistakes

Client-side only — Hiding a button isn't security. Check permissions on the server too
Missing checks — Every API endpoint needs authorization, not just the UI
Overly permissive — Start with minimal permissions, add more as needed
Hardcoded roles — Use a flexible role system, not if/else chains

AI and Authorization

When asking AI to add authorization:

Specify the roles clearly
Define what each role can and can't do
Emphasize server-side checks
Ask for middleware-based solutions for consistency

Authorization