What should I learn first about feed APIs?
A basic list endpoint. GET /users that returns a list. No pagination yet. Just confirm you can query and return JSON. Then add pagination, filtering, and sorting on top.
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More FAQs in Feed API Roadmap for Node.js: From Basics to Scale
Basic list, offset pagination, filtering, sorting, field selection, .lean(), indexes, exclude current user, exclude already-seen, cursor pagination for scale, caching, rate limiting, and monitoring. Take it one step at a time.
When the collection gets large (> 10000 docs) or the client uses infinite scroll. Cursor is faster (uses an index, no scanning of skipped docs) and stable (new items do not cause duplicates or skips).
When the feed is hot (many requests) and the first page does not change often. Cache the first page in Redis with a short TTL (e.g., 60 seconds). Saves database load. Invalidate on new signup or profile change.
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