Responce from integration contains square brackets, how to replace with curly brackets?

Hi, I have a response from an integration in json format, which has to be saved in local database in cdt format, but response contains square brackets and appian will not accept square brackets and is throwing an error of "open bracket", so i have to replace square brackets with curly brackets, can any one help me out with this, below is a part of response, thank you.

  "document": {
    "id": 30,
    "binder": true,
    "Admin": {
      "groups": [],
      "users": [

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