How would you diagnose a component that calls Hooks conditionally?

Repairs unstable Hook order caused by branches, early returns, callbacks, loops, or exception paths.

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TL;DR

Hooks must be called at the top level in the same order on every render. A conditional call, loop, nested callback, or early return before later Hooks can shift that order and make React associate state with the wrong call. I move the condition inside the Hook or split the conditional branch into another component.

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Practice focus

Rules of Hooks, call-order identity, refactoring, linting, and branch-focused tests.

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Answer path

Core answer first, then checkpoints toward a stronger answer.

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Core answer
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Overview
React associates Hook state by call order, so control flow that changes that order corrupts the component's state mapping.
Hooks must be called at the top level in the same order on every render. A conditional call, loop, nested callback, or early return before later Hooks can shift that order and make React associate state with the wrong call. I move the condition inside the Hook or split the conditional branch into another component.
Checkpoint
Stronger answer
Optional upgrade with examples, trade-offs, and sharper phrasing.
I reproduce the exact prop or state transition that changes the branch and inspect the first render that produces a different Hook sequence. The lint rule usually identifies the structural problem. If an Effect is conditional, the Hook still runs and its body returns early or manages cleanup based on the condition. If an entire feature has a distinct lifecycle, rendering a child component gives it an independent stable Hook order.

Review signals

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Common mistakesCandidateCommon mistakesMistakes that weaken the answer or signal shallow understanding.Open details

Details

Suppressing the lint rule without changing control flow.
Calling a custom Hook only when data exists.
Invoking a component function directly to reuse its logic.

How would you diagnose a component that calls Hooks conditionally?

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