When should I use $and explicitly in Mongoose?
When you need the same field twice with different operators, or to group $or conditions with other conditions. For most queries, passing multiple fields in one object ANDs them implicitly. Use $and only when implicit AND is not enough.
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More FAQs in Logical Query Building in MongoDB With Mongoose
$and takes an array of conditions; all must match. $or takes an array; any must match. Combine them: $and: [{ status: 'active' }, { $or: [{ age: { $lt: 18 } }, { age: { $gt: 65 } }] }] for active users under 18 or over 65.
Start with an empty filter object. For each query param that is present, add it to the filter. For range queries (minAge, maxAge), build an age object with $gte and $lte. Pass the filter to User.find(filter).
To prevent query injection. If users can set arbitrary filter fields, they can probe your data model. Whitelist the fields they can filter by (role, gender, status) and ignore the rest. Limits the surface.
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