How to Copy window.dataLayer

example.js

const getCircularReplacer = () => {
  const seen = new WeakSet(); // Use WeakSet to avoid memory leaks by holding strong references
  return (key, value) => {
    // If the value is an object or array, check if we've seen it
    if (typeof value === 'object' && value !== null) {
      // Check if it's a DOM element (a very common cause of circularity)
      if (value instanceof Element) {
        // Represent the DOM element simply, e.g., by its tag, id, and classes
        let representation = `[DOM Element: ${value.tagName}`;
        if (value.id) representation += `#${value.id}`;
        if (value.className && typeof value.className === 'string') representation += `.${value.className.split(' ').join('.')}`;
         representation += ']';
         return representation; // Return the simple representation instead of the complex object
      }

      // Check if we've encountered this object before (circular reference)
      if (seen.has(value)) {
        return '[Circular Reference]'; // Replace circular reference with a placeholder string
      }
      // If it's a new object, add it to our set
      seen.add(value);
    }
    // Return the value unchanged if it's not a circular reference or DOM element
    return value;
  };
};

// Now use this replacer with JSON.stringify and copy
copy(JSON.stringify(window.dataLayer, getCircularReplacer(), 2));