rtree-sql.js

A fork of sql.js with R-Tree spatial indexing support. Version 1.7.0 (stable). This library compiles SQLite to JavaScript via Emscripten, enabling in-memory SQL databases in browsers and Node.js. Key differentiator: includes SQLite R-Tree extension for spatial queries, which the upstream sql.js does not enable by default. Same API as sql.js: create, query, export databases using pure JavaScript. Release cadence is sporadic, tied to upstream updates and patches for the R-Tree feature. Not to be confused with native SQLite3 bindings for Node.js; this is a pure in-memory implementation loading entire DB into memory.