hyperformula
HyperFormula is a JavaScript engine for efficient processing of spreadsheet-like data and formulas
officeparser
A Node.js library to parse text out of any office file. Currently supports docx, pptx, xlsx, odt, odp, ods, pdf files.
@syncfusion/ej2-spreadsheet
Feature-rich JavaScript Spreadsheet (Excel) control with built-in support for selection, editing, formatting, importing and exporting to Excel