javascript - Return tree JSON structure by specified depth

Question

There is a piece of JSON, as follows:
According to the tree hierarchy, it is level 3. I now want to return to the first two levels and discard the third level. How can I use javascript code to achieve this?
Original structure:
[{

巴扎黑 · Answer

It is more convenient to use recursion for tree operations

depth is the number of reserved layers. Note that it is called for the node of that layer. 'id': 1,

function removeNode (root, depth) {
  if (typeof root !== 'object' || typeof depth !== 'number' || !Array.isArray(root.nodes)) { return root }
  if (depth < 1) { return {} }

  if (depth === 1) {
    root.nodes = []
  } else {
    root.nodes.forEach(node => {
      removeNode(node, depth - 1)
    })
  }

  return root
}