Optimistic Update

Definitions

1. A UI pattern where the interface immediately reflects a state change before the server confirms it, rolling back if the server request fails. Makes the app feel instant for operations that almost always succeed (likes, toggles, reordering). The opposite of pessimistic updates (wait for server response, then update UI).

   In plain English: Updating the screen immediately when a user clicks something, without waiting for the server, and undoing it if the server says no.

   Example: "The like button uses an optimistic update — it fills immediately on click, and if the API call fails, it reverts with a subtle error toast."

Related Terms

• Accessibility
• Selector
• Islands Architecture
• Debounce
• Throttle
• Skeleton Screen
• GraphQL Fragment
• Modal
• Skeleton Loading
• Spinner