Do custom hooks follow the rules of hooks?
Yes. Custom hooks must follow the rules of hooks: call hooks at the top level, not in conditions or loops. The lint plugin enforces this inside custom hooks, just as it does inside components.
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More FAQs in How to Create a Custom Hook in React: A Step-by-Step Tutorial
Identify repeated logic, name a function starting with 'use', move the state and effects inside, accept arguments for flexibility, return what the component needs, and use it in a component like you would use useState. Follow the rules of hooks inside it.
useFetch. If you fetch data in multiple components with the same loading, error, and data pattern, extracting it into a useFetch hook is a perfect first custom hook that immediately reduces duplication.
Whatever makes it flexible for different uses. A useFetch hook accepts a URL. A useForm hook might accept initial values and a validation function. Arguments let one hook serve many components.
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