What is the difference between find() and findOne()?

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Accepted Answer

Both retrieve documents from a collection but differ in what they return. find(filter) — returns a cursor over all matching documents . Iterate to consume; supports chaining .sort() , .limit() , .skip() . findOne(filter) — returns the first matching document directly (or null ). No cursor. Use findOne when you expect a single result (lookup by ID); use find when iterating multiple matches. find = cursor (many results, chainable). findOne = single document or null (no cursor). find().limit(1) is similar but returns a cursor. findOne is preferred for by-_id lookups. Cursors are lazy (batch fetching) — important for large result sets.