What are the solutions to parse complex JSON with mutable schema structure?

Question

Java

Hello!
Junior in Java programming. In the process of learning, I set myself a training task for working with JSON.

When exporting bookmarks, Google Chrome generates an html file with information about all the bookmarks that were (including nesting in different folders).
I want to get the entire list of urls from that file, taking into account nesting, and then, based on the information received, get a new json with a different structure.

An example of such a Chrome export (my file has 25 thousand lines):

{
    "checksum": "...",
    "roots": {
       "bookmark_bar": {
        "children": [ {
            "children": [ {
               "children": [ {
                  "date_added": "13041636353545778",
                  "guid": "73d733d0-a949-4931-a309-ad5dd4e7d7aa",
                  "id": "7",
                  "name": "14 СЕРВИСОВ ДЛЯ СОЗДАНИЯ ИНФОГРАФИКИ — Medium",
                  "type": "url",
                  "url": "https://medium.com/p/d7eaf1d4de32"
                  }]
                  }]
                  }]
        },
         "date_added": "13219315411214455",
         "date_modified": "13244927499721694",
         "guid": "00000000-0000-4000-a000-000000000002",
         "id": "1",
         "name": "Bookmarks bar",
         "type": "folder"
      },
       "other": {
        "children": [  ],
        "date_added": "13219315411214461",
        "date_modified": "0",
        "guid": "00000000-0000-4000-a000-000000000003",
        "id": "2",
        "name": "Other bookmarks",
        "type": "folder"
     },
     "synced": {
        "children": [  ],
        "date_added": "13219315411214464",
        "date_modified": "13243676447438187",
        "guid": "00000000-0000-4000-a000-000000000004",
        "id": "3",
        "name": "Mobile bookmarks",
        "type": "folder"
     },
     
  "sync_metadata": "...",
  "version": 1
}

I read about various libraries here https://habr.com/ru/company/luxoft/blog/280782/
and I don’t see any problems for simple json, but I want to parse these bookmarks, while taking into account their nesting in folders (for example, get on urls output + what folder they were in).

In what way can this be done?
It is not necessary to give a decision, there may be advice in which direction to dig or where to look.
Thank you!

Answer 1

Jackson to the rescue. I don't see any problem here.
You go through the folders and parse the data from them first into Java objects. I do not remember exactly how, but you can get the path to the file and simply add it to the object. Then you turn the object into JSON.