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Three useful foundations for React architecture are to divide the interface into meaningful components, keep state minimal and straightforward to update, and give every state value a clear owner. This is an editorial synthesis of React’s guidance, not an official ranking: React’s documentation presents principles and examples rather than a universal “top three.”
1. Break the interface into meaningful components
Component structure is a design choice. Start with the visual design and identify the interface’s distinct responsibilities and relationships; then organize those responsibilities into a component hierarchy. React’s Thinking in React guide lays out this process, including building a static version before adding interactivity.
Choose boundaries by responsibility
A component should have a coherent purpose. Split one when it takes on too many concerns or grows difficult to understand, but do not turn every small visual detail into a separate component. Related subparts can stay together when they contribute to one clear responsibility. The right granularity depends on the interface, not a fixed rule.
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A well-structured data model can also suggest component boundaries: the entities and relationships the UI presents may help clarify which parts of the interface belong together. Treat that as a design aid, not a requirement that every data object map to a component.
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Build the static interface first
Before adding state and event handling, implement the visual structure using props and static data. This separates two questions: whether the component hierarchy represents the design, and how the interface should change in response to interaction. It also makes it easier to spot boundaries that need adjustment before state adds complexity.
2. Keep state minimal and easy to update
State is the changing information a component tree needs to remember. Store the information that can change and is needed to render the UI; calculate values that can be derived from props or existing state instead of storing another copy. React’s Choosing the State Structure guide explains how to avoid state that is redundant, duplicated, contradictory, or unnecessarily nested.
Do not store values you can calculate
If a value can be computed from current props or state during rendering, a separate state variable creates an extra synchronization burden. For example, storing both a selected item and a separately maintained display label can cause them to disagree if one changes without the other. Keep the source value and derive the display value when needed.
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State should be understandable and practical to update. Duplicating the same information in multiple places means every update must keep those copies in sync. Contradictory state permits combinations the interface should not represent. Deeply nested structures can make targeted updates harder. Where it fits the data, a flatter representation can make relationships and updates clearer.
The aim is not to minimize the number of variables at any cost. A value belongs in state when it represents changing information the UI needs to remember; the useful test is whether storing it makes the interface clearer without introducing avoidable duplication or synchronization work. As React’s documentation puts it, “The goal behind these principles is to make state easy to update without introducing mistakes.”
3. Give each state value a clear owner
Keep a state value in the component that needs it when no other component must coordinate with it. When multiple components need the same changing information, place that state in their closest common parent and pass the value and event handlers to the components that need them. React calls this “lifting state up” in its Sharing State Between Components guide.
Lift state only as far as coordination requires
Moving every state value to the root of the application makes unrelated components depend on a shared owner and can add unnecessary complexity. Instead, find the lowest common ancestor of the components that need to stay coordinated. Let that parent own the shared value, then pass it and the relevant handlers down through props. State that only one component uses can remain local.
Use controlled or uncontrolled behavior deliberately
React’s documentation uses “controlled” and “uncontrolled” to describe where a component’s important information is managed. A controlled component receives the relevant value or configuration from its parent, giving the parent more flexibility to coordinate behavior. An uncontrolled component manages more of its own information, which can make it simpler to use within that parent.
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These are useful design terms, not strict technical categories. Choose based on whether outside components need to configure or coordinate the behavior; there is no need to make every component controlled.
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These choices reinforce one another. Meaningful component boundaries reveal which parts of the UI need to coordinate. Minimal state limits the information those components must keep in sync. Clear ownership then determines which component holds each changing value and which components receive it through props.
React’s guidance supports these principles, but it does not prescribe a universal project folder layout, component granularity, or state-management library. Use the structure that fits the application rather than treating these practices as rigid rules.
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