GroupDocs.Merger for Node.js via Java is a powerful API to merge several documents into one, split single document to multiple documents, reorder or replace document pages, change page orientation, manage document protection, render documents as images and more....GroupDocs.Merger for Node.js via Java is a powerful API to merge several documents into one, split single document to multiple documents, reorder or replace document pages, change page orientation, manage document protection, render documents as images and more.