malta/devtest/local/src/my_epub.json

Lightning builder allows to compose on the fly and update packed and full coded huge files, edit its parts as files, splitted and glued as You need.

{
    "title": "Alice's Adventures in Wonderland",
    "author": "Lewis Carroll",
    "publisher": "Macmillan & Co.",
    "cover": "http://vignette.wikia.nocookie.net/villains/images/d/d3/How-to-draw-a-rhino-step-11_1_000000050163_5.jpg/revision/latest/scale-to-width-down/640?cb=20140901173830",
    "content": [
        {
            "title": "About the author",
            "author": "John Doe",
            "data": "epubcontent/chapter1.md"
        },
        {
            "title": "Down the Rabbit Hole",
            "data": "epubcontent/chapter2.md"
        },
        {
            "title": "The world outside the cradle what",
            "data": "epubcontent/chapter3.md"
        }
    ]
}