: Every EPUB needs a container.xml and an .opf file to tell the reader where the chapters are and who wrote the book. Libraries like @smoores/epub for Node.js are built specifically to manage these requirements. Beyond Coding: No-Code Alternatives

: This library uses a "template" approach, gutting a sample EPUB and refitting it with your specific content and metadata.

You don't have to build a ZIP archiver from scratch. Several high-quality libraries handle the heavy lifting:

: A powerful, modern choice that works in both Node.js and the browser. It automatically handles the fetching of images and fonts, which is often the most tedious part of the process.