Save data to a file from the browser console.

console_save.js

console.save = function save(data, filename = "console.json") {
  if (data === undefined) {
    console.error("console.save: No data provided");
    return;
  }

  let content;
  let mimeType = "application/json";

  try {
    if (typeof data === "string") {
        content = data;
        mimeType = "text/plain";
    } else {
        content = JSON.stringify(data, null, 4);
    }
  } catch (err) {
    console.error("console.save: Failed to serialize data", err);
    return;
  }

  const blob = new Blob([content], { type: mimeType });
  const url = URL.createObjectURL(blob);

  const a = document.createElement("a");
  a.href = url;
  a.download = filename;
  a.style.display = "none";

  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);

  URL.revokeObjectURL(url);
};