How do I implement filtering in a Node.js API?
Use query params. Build a filter object based on which params are present. Whitelist the fields users can filter by to prevent query injection. Pass the filter to Model.find(filter).
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More FAQs in Filtering and Sorting in Node.js APIs: A Complete Guide
Use sortBy and order query params. Whitelist sortable fields to prevent errors and abuse. const sortBy = allowedSorts.includes(req.query.sortBy) ? req.query.sortBy : 'createdAt'. Use .sort({ [sortBy]: order }).
To prevent query injection (users setting arbitrary filter fields to probe your data) and errors (users sorting by a field that does not exist). Whitelisting limits the surface and keeps the API predictable.
Build a filter, sort, and select from query params. Then User.find(filter).sort(sort).skip(skip).limit(limit).select(select).lean(). Run find and countDocuments in parallel with Promise.all. Return { data, total, skip, limit }.
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