DuckDB - DuckDB-Wasm: Efficient Analytical SQL in the Browser
DuckDB-Wasm is an in-process analytical SQL database for the browser. It is powered by WebAssembly, speaks Arrow fluently, reads Parquet, CSV and JSON files backed by Filesystem APIs or HTTP requests and has been tested with Chrome, Firefox, Safari and Node.js. You can try it in your browser at shell.duckdb.org or on Observable.
Filesystem Apis Dominik Moritz Webassembly Community Group Efficient Analytical Web Filesystem Without Webassembly
Source: duckdb.org