Fix invalid hook call and rules of hooks violations
React enforces strict rules for hooks: they must be called at the top level of a function component, not inside loops, conditions, or nested functions. Violating these rules causes cryptic errors.
Error messages you might see
Invalid hook call. Hooks can only be called inside of the body of a function component.React has detected a change in the order of Hooks called by Component. This will lead to bugs and errors.Why this happens in AI-generated code
Calling hooks inside conditions or loops
AI-generated code sometimes wraps hook calls inside if statements or loops, violating React's requirement that hooks are called in the same order every render.
Duplicate React instances
AI tool suggestions for dependency installation can lead to multiple React versions in node_modules, causing hooks to reference different React instances.
Calling hooks in regular functions
AI tools sometimes extract logic into plain helper functions that call hooks, but hooks only work inside React function components or custom hooks.
How to fix it
Move hooks to the top level of your component
Ensure all hook calls are at the top of your component function, before any early returns, conditions, or loops. Move conditional logic inside the hook callbacks instead.
Check for duplicate React packages
Run `npm ls react` to check for multiple React installations. If you see duplicates, use resolutions/overrides in package.json to force a single version.
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Still stuck? Our engineers can fix hooks violations and restructure your component logic. Visit /products to get started.
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Frequently asked questions
Can I call hooks inside a callback function?
No. Hooks must be called directly in the function component body or in custom hooks - never inside callbacks, promises, or event handlers. Extract the hook call to the component level.
What is a custom hook and how does it help?
A custom hook is a function prefixed with 'use' that can call other hooks. It lets you extract and reuse stateful logic while keeping hook calls at the correct level.
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