Glossary term
What is optimistic update? Meaning for developers
In Full-Stack Questions
Showing the result in the UI right away and undoing it if the server says no.
Learn it properly · Full-Stack QuestionsLesson 25: State and Data Libraries in DepthRedux Toolkit, TanStack Query v5, Zustand and Jotai, server state vs client state, optimistic updates, hydration with the App Router, forms with Zod.In React in Depth
Showing the expected result right away while the server request is still running.
Learn it properly · React in DepthLesson 4: Forms, Events and Controlled InputsControlled and uncontrolled inputs, form actions and useActionState in React 19, validation, and accessibility basics.