Schema: numberOfItems
Schema: numberOfItems Example Markup
The following are examples of markup written in json+ld that include the correct usage for Schema: numberOfItems.
ItemList JSON-LD example for a curated top-5 Xoo products page. Covers ListItem with position and url for carousel eligibility, the difference between summary and detail pages, numberOfItems, itemListOrder, and how Google uses ItemList to render carousel rich results for listicle content.
MusicAlbum JSON-LD example for The Children's Doctor film score. Covers track listing with MusicRecording references, numTracks, albumProductionType and albumReleaseType enums, byArtist as a shared credit, and how MusicAlbum connects to MusicRecording via the track property.
SearchResultsPage JSON-LD example for an on-site search-results page. Direct WebPage subtype. Use noindex meta + SearchResultsPage type to signal a results page to crawlers.
CollectionPage JSON-LD example for a listing / category / tag page. Direct WebPage subtype. Parent of ImageGallery and VideoGallery.