This archive provides a harmonised set of GeoJSON layers for a single city, extracted from OpenStreetMap (OSM) as of mid-April 2025 under the ODbL licence. The package is organised by theme—Buildings, Streets, Points of Interest, Land Use, Transport, and Environment—each folder containing one or more GeoJSON files (e.g., building_footprints.geojson, street_edges.geojson) together with a plain-text metadata note and, where applicable, XLSX summary tables. Root-level items include the administrative boundary (city_boundary.geojson), an interactive HTML reference map, a consolidated textual and spreadsheet overview of all layers, and the extraction log. All geometries are delivered in EPSG 4326 (WGS 84), enabling direct ingestion into QGIS or any GIS that supports GeoJSON without further reprojection.