Parses the data from NCDU dump file https://dev.yorhel.nl/ncdu/jsonfmt, the folder sizes are probably wrong tho....

parse.js

var computeDirSize = (list) =>
  list.reduce((prev, curr) => {
    if (curr.type === "FOLDER") {
      return computeDirSize(curr.children) + prev;
    } else {
      return curr.value + prev;
    }
  }, 0) || 0;

var readFile = file => ({
  type: "FILE",
  name: file.name,
  value: file.asize || 1,
});

var readFolder = ([folderInfo, ...folderItems]) => {
  const children = folderItems.map(recursiveRead).sort((a, b) => a.value - b.value);

  return {
    type: "FOLDER",
    name: folderInfo.name,
    value: computeDirSize(children) || 1,
    children,
  };
};

var recursiveRead = (items) => {
  if (Array.isArray(items)) {
    return readFolder(items);
  } else {
    return readFile(items);
  }
};
l=recursiveRead(z)
fs.writeFileSync('./parsed.json', JSON.stringify(l))