Dev Tools · 2h ago
Optimistic UI Bug: Fast Clicks Break Data Integrity in Next.js 16
A developer discovered that rapidly clicking an optimistic UI checkbox in Next.js 16 causes database state to diverge from the UI. Five overlapping requests flipped the same boolean in arbitrary order, with no errors or visual feedback. The fix involves disabling the input while a request is pending, using a per-item pending state.
Meridian48 take
The article highlights a subtle but critical race condition in optimistic UI patterns, reminding developers that visual correctness doesn't guarantee data integrity.
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My Next.js 16 Optimistic UI Looked Perfect. Then Someone Clicked It Five Times Fast →
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