Retrieve and correctly order listing photos using the RESO Web API Media resource with $expand
domain: reso.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Query Property with $expand=Media to return photo/document records inline with each listing, rather than issuing a separate Media call per listing
Sort the returned Media array by the Order field to reproduce the listing agent's intended photo sequence
Use MediaKey as the stable identifier for deduplication and change detection between syncs
Filter on MediaType or MediaCategory to separate photos from virtual tours, floor plans, and documents
Re-fetch Media on a schedule tied to ModificationTimestamp changes rather than assuming photos are static once pulled
Known gotchas
Omitting $expand=Media and instead querying the Media resource separately per listing multiplies request volume and can trip rate limits on large syncs
The primary/cover photo is conventionally the lowest Order value, but this is a data-dictionary convention rather than a query-level guarantee — verify a given MLS actually populates Order consistently
Media URLs are frequently time-limited or signed; downstream systems should not persist raw MediaURL values long-term without re-resolving or downloading the asset
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