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Phase 10 · API Integration

Topics

Optimistic UI

Part of the Frontend Developer Roadmap.

Summary

Updating the UI immediately as if an action succeeded, before the server confirms it, then rolling back if it actually fails — makes apps feel instant.

How to Learn This

  • 1Build a 'like' button that updates instantly, then reverts on API failure.
  • 2Learn `useMutation`'s `onMutate`/`onError` in React Query for this pattern.
  • 3Consider the UX trade-off: speed vs occasionally showing a brief rollback.

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Caching

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File Upload

More topics in API Integration

REST APIsAxiosFetchPaginationFilteringSortingSearchAuthenticationJWTRefresh TokenError HandlingLoading StateCachingFile UploadMultipart Form
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