Why use query params for pagination instead of body?
Because pagination belongs in the URL. GET requests should not have a body. Query params (?skip=0&limit=20) are cacheable, bookmarkable, and shareable. Body pagination breaks HTTP semantics.
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More FAQs in Pagination Best Practices for Node.js APIs
Always paginate, cap the limit, use cursor for large collections, use offset for page numbers, index the sort or cursor field, use .lean() and .select(), return metadata, use a stable sort (tiebreaker on _id), handle empty results, validate the cursor, use query params not body, and document the scheme.
To prevent abuse. Without a cap, a client can request 10000 items, eating memory and bandwidth. Use Math.min(parseInt(req.query.limit) || 20, 100). Most UIs only show 20 at a time anyway.
If you sort by createdAt, ties are possible (two items with the same timestamp). Without a tiebreaker, cursor pagination can skip or duplicate items. Use .sort({ createdAt: -1, _id: 1 }) to make the sort stable.
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