Why use projections in MongoDB queries?
To fetch only the fields you need, which reduces memory usage and network traffic for large documents. Instead of fetching a full user document when you only need the name, use a projection to get just the name field.
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More FAQs in MongoDB With Node.js Best Practices for Production
Use Mongoose for schema management, add indexes for frequently queried fields, use connection pooling, handle connection errors, use environment variables for the connection string, validate at the schema level, and use projections to fetch only what you need.
Because Mongoose provides schemas, validation, and middleware. It prevents bugs by enforcing structure, makes the data model clear, and handles common patterns like population and middleware that the raw driver does not.
Because without indexes on frequently queried fields (email, userIds), queries scan the entire collection and get slow as data grows. Index the fields you filter and sort by for fast queries.
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