geopackage-js

Works seamlessly in web browsers using HTML5 Canvas and sql.js, and in Node.js with PureImage and node-sqlite3, as shown in the detailed usage examples for both environments.

Provides utilities like GeoPackageTileRetriever and FeatureTiles to retrieve and draw map tiles stored in GeoPackage files, enabling direct visualization in canvases without external services.

Supports querying vector features with spatial indexing and exports data to GeoJSON format using methods like queryForGeoJSONFeatures, simplifying integration with other geospatial tools.

Includes comprehensive examples for offloading heavy geoprocessing to Web Workers, as demonstrated in the worker.js setup, preventing main thread blockage in browsers.