# Usage Monitoring Fix - Learnings

## 2026-05-30: Admin Access Control Verification

### Files Reviewed
- /api/usage/route.js - Main usage API endpoint
- /lib/auth/jwt.js - JWT token verification
- /lib/db/repos/usageRepo.js - Usage data repository

### Admin Access Control Implementation

#### Admin Role Check
\\\javascript
// route.js line 17
if (!payload || payload.role !== 'admin') return null;
\\\
- **Status**: ? Correctly implemented
- **Logic**: Returns null if user is not an admin

#### JWT Token Parsing
\\\javascript
// route.js line 26
return payload?.userId || null;
\\\
- **Status**: ? Correctly implemented
- **Logic**: Safely extracts userId from JWT payload

### Key Findings
1. Admin access control is correctly implemented
2. JWT token parsing is correct
3. No code changes needed - implementation matches requirements

### Verification Steps
- ? Admin can see all users data (without userId parameter)
- ? Admin can filter by specific userId
- ? Non-admin users can only see their own data
- ? JWT token parsing correctly extracts userId
- ? Admin role check correctly validates admin status

