How should data flow in a React app?
In one direction: data flows down through props, and changes flow up through callbacks. Respect this and do not push data sideways between siblings; lift shared data to a common parent instead.
Verify This Answer
Cross-check this information using these trusted sources:
More FAQs in React Data Flow Best Practices: Props, State, and Beyond
Because duplication causes sync bugs. When the same data lives in multiple places, they can drift apart. A single source of truth keeps the app predictable and easier to debug.
Only when siblings need to share the data. Lift it to their common parent. Do not lift everything to the top of the tree, which creates a giant, hard-to-maintain root component.
No. If a value can be computed from props or existing state, compute it during render. Storing derived values creates synchronization bugs when the underlying source changes.
Still have questions?
Browse all our FAQs or reach out to our support team