get-bandcamp-album-metadata.js

// go to Bandcamp edit album page, open dev console (f12), paste and run

function download() {
  const sel = (selector, base = document) => base.querySelectorAll(selector);

  const get = (selector, base) => {
    elements = sel(selector, base);
    element = elements[0] || {};
    return element.value || element.innerText || "";
  };

  const title = get("[name='album.title']");
  const date = get("[name='album.release_date']");
  const about = get("[name='album.about']");
  const credits = get("[name='album.credits']");

  const rows = sel("li.track");
  const tracks = [];

  for (const row of rows) {
    const title = get("[name*='track.title']", row);
    const about = get("[name*='track.about']", row);
    const lyrics = get("[name*='track.lyrics']", row);
    const credits = get("[name*='track.credits']", row);

    tracks.push({ title, about, lyrics, credits });
  }

  const data = { title, date, about, credits, tracks };

  const blob = new Blob([JSON.stringify(data)], { type: "application/json" });
  const url = window.URL.createObjectURL(blob);
  const link = document.createElement("a");
  document.body.appendChild(link);
  link.href = url;
  link.download = title.toLowerCase();
  link.click();
}

download();