spl.js

Includes SpatiaLite 5.1.1-rc0 with SQLite, GEOS, PROJ, and RTTOPO, enabling advanced operations like topology creation and coordinate transformations directly in JavaScript.

Provides identical synchronous API for Node.js and asynchronous API for browsers via Web Workers, simplifying code reuse across server and client environments.

Automatically handles JSON, GeoJSON, WKB, and supports importing GeoPackage and zipped Shapefiles, as shown in examples loading London boroughs and lights data.

Allows mounting local or remote files (including URLs) for read/write operations, enabling database imports and exports without server dependencies.