file-type
Detect the file type of a file, stream, or data
officeparser
A Node.js library to parse text out of any office file. Currently supports docx, pptx, xlsx, odt, odp, ods, pdf files.
@sgtpooki/file-type
An *Ackchyually* browser compatible file-type hacky replacement of the `file-type` package. Forked from https://github.com/sindresorhus/file-type
aspose.slides.via.java
A powerful library for manipulating and converting PowerPoint (PPT, PPTX, PPS, POT, PPSX, PPTM, PPSM, POTX, POTM), ODP, ODS, CSV, TXT, PNG, EMF, JPG, JSON and HTML files.