Panel-ready MERN Full Stack questions for freshers and experienced developers. Practice at Coding Cadre in Faridabad, or Online from Delhi NCR.
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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It pins exact dependency versions for reproducible installs.
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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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It parses JSON bodies into req.body.
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Context or a small store hydrated from /me.
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Listen for process warnings, ensure every async path catches, and crash responsibly in production supervisors.
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JSON Schema rules on collections catch bad documents.
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