https://api.mangadex.org/docs.html#section/Reading-a-chapter-using-the-API/Retrieving-pages-from-the-MangaDex@Home-network

mangadex_chapter.js

async function searchManga(title) {
    const result = await (await fetch(`https://api.mangadex.org/manga?title=${encodeURI(title)}`)).json();
    return result.results.map(v => v.data)
}
async function getChapters(mangaID) {
    const result = await (await fetch(`https://api.mangadex.org/chapter/?manga=${mangaID}&limit=50`)).json();
    return result.results;
}
async function getChapterInfo(chapterID) {
    const result = await (await fetch(`https://api.mangadex.org/chapter/${chapterID}`)).json();
    return result;
}
async function atHomeLink(chapterID) {
    const result = await (await fetch(`https://api.mangadex.org/at-home/server/${chapterID}`)).json();
    return result.baseUrl;
}
function craftImageLink(homeLink, chapter, isDataSaver=true) {
    // {server-specific base url}/{temporary access token}/{quality mode}/{chapter hash}/{filename}
    const mode = isDataSaver? "data-saver" : "data";
    const chapterHash = chapter.data.attributes.hash;
    const images = chapter.data.attributes[isDataSaver? "dataSaver" : "data"]
                        .map(img => `${homeLink}/${isDataSaver}/${chapterHash}/${img}`);

    return images;
}
function listChapters(chapters) {
    return chapters.map(chapter => chapter.data.attributes).map(v => `v${v.volume}c${v.chapter}: ${v.title}`)
}

let MANGA_NAME = "kubera";
let CHAPTER_INDEX = 0;

// get first search result
let manga = (await searchManga(MANGA_NAME))[0];
// get chapter IDs
let mangaChapters = await getChapters(manga.id);
// get home link with first chapter ID
let homeLink = await atHomeLink(mangaChapters[CHAPTER_INDEX].data.id);
// get image links
console.log(mangaChapters[CHAPTER_INDEX])
let firstChapter = (await getChapterInfo(mangaChapters[CHAPTER_INDEX].data.id));
let imageLinks = craftImageLink(homeLink, firstChapter, true);




//console.log(listChapters(mangaChapters));
console.log(listChapters(mangaChapters)[CHAPTER_INDEX]);
console.log(imageLinks.join("\n"));

imageLinks.forEach(s => {
    let m = document.createElement("img");
    m.src = s;
    document.body.append(m);
});