spl.js: SpatiaLite for Node.js and Browser

spl.js bundles SpatiaLite 5.1.1-rc0 with SQLite 3.51.1, GEOS 3.14.1, PROJ 9.7.1, and rttopo 1.1.0 for spatial operations in Node.js (sync API) and browsers (async API). Released under ISC license, it provides a unified API for managing spatial databases, importing GeoPackage and Shapefile formats, and handling GeoJSON/JSON transparently. Key differentiators: includes a minimal proj.db for Web Mercator and UTM, supports custom extensions, and auto-detects JSON/GeoJSON bindings. The WASM binary is ~4.5MB gzipped and ships TypeScript definitions. Release cadence is ongoing with version 1.0.1 as of 2025.