You should be able to do this entire thing in-browser. Going further, leveraging WebSQL or SQL.js, it should be possible to pump the queries into a client-side

You should be able to do this entire thing in-browser. Going further, leveraging WebSQL or SQL.js, it should be possible to pump the queries into a client-side database and run queries. Shameless plug: I built an in-browser tool to generate SQL queries from Excel XLS/XLSX/XLSB files: http://sheetjs.com/sexql/ http://sheetjs.com/sexql/ Discussion: https://news.ycombinator.com/item?id=7392665 https://news.ycombinator.com/item?id=7392665