Convert nested JSON to CSV

I see a post Convert nested JSON to CSV or table, the poster have JSON data like this:
menu1.json

 {"menu": {
  "id": "file",
  "value": "File",
  "popup": {
    "menuitem": [
      {"value": "New", "onclick": "CreateNewDoc()"},
      {"value": "Open", "onclick": "OpenDoc()"},
      {"value": "Close", "onclick": "CloseDoc()"}
    ]
  }
}}

He want to convert it to CSV or table like this:

I use Data File Converter to do this, in a minute.

Just open JSON file in DataFileConverter, and set options like this:

And then “Next” and “Next”, convert, get the output CSV file.