Proactive error handling for React and vanilla JS frontends — every data-fetching component gets loading, error, and empty states, error boundaries, fetch error handling, form validation, optimistic rollback
90
84%
Does it follow best practices?
Impact
100%
1.38xAverage score across 5 eval scenarios
Passed
No known issues
Loading state while fetching orders
100%
100%
Error state with retry for order fetch
50%
100%
Empty state for no orders
100%
100%
Reorder action error handling
100%
100%
Fetch handles network errors
100%
100%
Fetch handles HTTP errors
100%
100%
Error state uses role=alert
0%
100%
User-friendly error messages
100%
100%
Error boundary present
0%
100%
Loading state while fetching products
100%
100%
Error state with retry for product fetch
50%
100%
Empty state for no products
0%
100%
Error state uses role=alert
0%
100%
Fetch handles network errors
100%
100%
Fetch handles HTTP errors
100%
100%
Add to cart error handling
100%
100%
User-friendly error messages
100%
100%
Error boundary present
0%
100%
Loading state while fetching settings
100%
100%
Fetch error state with retry
28%
100%
Submitting/saving state shown
100%
100%
Submission error handling
100%
100%
Client-side validation
20%
100%
Error messages use role=alert
60%
100%
Fetch handles HTTP errors
100%
100%
User-friendly error messages
87%
100%
Error boundary present
0%
100%
Loading state while fetching team members
100%
100%
Error state with retry for team fetch
50%
100%
Empty state for no results
100%
100%
Invite form submission error handling
100%
100%
Invite form submitting state
100%
100%
Invite form client-side validation
90%
100%
Fetch handles network and HTTP errors
100%
100%
Error messages use role=alert
0%
100%
User-friendly error messages
100%
100%
Loading state while fetching profile
100%
100%
Error state with retry for profile
37%
100%
Error state uses role=alert
0%
100%
Fetch handles network errors
100%
100%
Fetch handles HTTP errors
100%
100%
User-friendly error messages
70%
100%
Empty activity state handled
100%
100%
Error boundary present
0%
100%