winnow

Apply SQL-like filters to GeoJSON feature collections in memory or via streams. v2.6.0 is the last standalone release; development has moved to @koopjs/winnow in the Koop monorepo. Supports WHERE clauses, spatial predicates (ST_Within, ST_Contains, ST_Intersects), field selection, aggregations (sum, avg, count, max, min, first, last), group by, limit/offset, ordering, CRS reprojection, and Esri feature output. Ships TypeScript types.