What format for JSON Generic import?

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Since, I need to redo the users, would this work. In this example, user 1 (John Doe) creates topic 1, “The Title”, and this topic has 1 post by John Doe with content of Body?

If this is correct, How do I use the json_generic script to start the process? I’m a little confused on the next step in the process.

  "topics": [
      {
        "id": 1,
        "user_id": "1",
        "title": "The title",
        "pinned": false,
        "posts": [
          {
            "id": 2,
            "user_id": "1",
            "body": "The body",
            "date": "The date",
            "author": "username"
          }
        ]
      }
    ],
  "users": [
       {
    "id": "1",      
    "name": "John Doe",
    "email": "John_Doe@wahoo.com",
    "password": "asfd9!t",
    "username": "John Doe",
    "active": true,
    "approved": true
  },  

]
  }