file-type
Detect the file type of a file, stream, or data
docxtemplater
Generate docx, pptx, and xlsx from templates (Word, Powerpoint and Excel documents), from Node.js, the Browser and the command line
chromiumly
A lightweight Typescript library that interacts with Gotenberg's different modules to convert a variety of document formats to PDF files.
officeparser
A Node.js library to parse text out of any office file. Currently supports docx, pptx, xlsx, odt, odp, ods, pdf files.