how to get JSON nested data-CodePudding

Hope you all are doing well, I need some help please, I am developing an app using JSON file and I want to search for a value in that file, I did good so far, but what I couldn't understand is that when I search for some value it prints, other no and throw an error, Here is my JSON file Stucture:

[ 
    { "Category": "Brain",
         "Value": [
            ] },
    {     "Category": "NODE",
         "Value": [ ]}  ]

As you can see, the file includes category and value, and each value is a list

  {
    "ErrorType": "backendToBrain",
    "ErrorList": [
      {
        "HexCode": "0x1100",
        "DecCode": 4352,
        "reason": ""
      },
   
      {
        "HexCode": "0x1102",
        "DeCode": 4354,
        "reason": "File error"
      },
      {
        "HexCode": "0x1103",
        "DeCode": 4355,
        "reason": "GNSS error"
      },
      {
        "HexCode": "0x1104",
        "DeCode": 4352,
        "reason": "IP error"
      },
   
    ]
  },
  {
    "ErrorType": "userToBrain",
    "ErrorList": [
      {
        "HexCode": "0x1001",
        "DecCode": 4097,
        "reason": "Memory Error, Cycle Req"
      },
    
      {
        "HexCode": "0x1005",
        "DecCode": 4101,
        "reason": "Node not available"
      }
    ]
  },

  {
    "ErrorType": "BLEToBrain",
    "ErrorList": [
      {
        "HexCode": "0x1200",
        "DeCode": 4608,
        "reason": ""
      },

      {
        "HexCode": "0x1203",
        "DeCode": 4611,
        "reason": "Error initialising security"
      },
   
    
    ]
  }

and each list contains a value "ErrorType" and a list of that error, so I want to search for a specific data, I wrote this method

  static List<CodeReasonObj> searchForError(data, BrainErrorType brainErrorType) {
List<CodeReasonObj> g = [];
for (int index = 0; index < data.length; index  ) {
  if (data[index]['Category'] == 'Brain') {
    for (int i = 0; i < data[index]['Value'].length; i  ) {
      if (data[index]['Value'][i]['ErrorType'] ==
          brainErrorType.toString()) {
        g = List.generate(
            data[index]['Value'][i]['ErrorList'].length,
                (j) =>
                CodeReasonObj(
                    HexCode: data[index]['Value'][i]['ErrorList'][j]['HexCode'],
                    DecCode: data[index]['Value'][i]['ErrorList'][j]['DecCode'],
                    reason: data[index]['Value'][i]['ErrorList'][j]['reason'])
        );
        for (int i = 0; i < g.length; i  ) {
          print(g[i].HexCode);
        }
      }
    }
  }
}
return g;

}

when the brain is equals to userToBrain, it works fine and return the list, when it is another value, it does not work

here is a link to my JSON file : https://drive.google.com/file/d/1JAtELt0VQBCYLrqBY03Ym5BSqZeigE8Z/view?usp=sharing

CodePudding user response：

I believe the error is most likely because the JSON has typos in it. At many places where it's supposed to say

DecCode

it actually says

DeCode

CodePudding user response：

If your JSON structure is true, you can paste your JSON in the link below, click convert and get your Dart classes for free.