Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....to the documents directory. const dataDir = path . join ( __dirname..."data" ); const filePath = path . join ( dataDir , "book1.xls" ); //...