Panel-ready MERN Full Stack questions for freshers and experienced developers. Practice at Coding Cadre in Faridabad, or Online from Delhi NCR.
Context passes data through the tree without prop drilling, such as theme or the current user.
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A controlled input takes its value from React state and updates through onChange.
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React.memo skips re-rendering a component when its props are shallowly equal.
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Trigger the request in useEffect or a data library such as React Query, handle loading and error states, and cancel or ignore stale responses.
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Lift state when two nearby components share data.
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A custom hook is a function starting with use that calls other hooks.
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Mongo fits flexible documents and fast iteration when schemas evolve.
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An index is a sorted structure that helps find documents without a full collection scan.
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An index on multiple fields matching common filters and sorts.
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Backend secrets stay in server env files never committed.
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Context or a small store hydrated from /me.
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JSON Schema rules on collections catch bad documents.
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