csv
A mature CSV toolset with simple api, full of options and tested against large datasets.
hyperid
Uber-fast unique id generation, for Node.js and the browser
docxtemplater
Generate docx, pptx, and xlsx from templates (Word, Powerpoint and Excel documents), from Node.js, the Browser and the command line
simplex-noise
simplex-noise is a fast simplex noise implementation in Javascript. Works in node and in the browser.