Get length of nested JSON property in Flutter-CodePudding

The dart code below accesses nested JSON properties by using json.decode(), but there does not seem to be a property for count, length, or size.

Is it possible to get the length of a nested JSON property in Flutter?

JSON Response:

{
    "obj1":{
        "list1":[
            {"key1":"value1"},
            {"key2":"value2"},
            {"key3":"value3"}
        ]
    }
}

Dart code:

var response = await httpRequest.response;
Map<String, dynamic> responseJson = json.decode(response.data);
print(responseJson['obj1']['list1']); // How to get length?

CodePudding user response：

You can get the length of the map with the length property. It will give you the number of pairs on the map (or submap):

    print(responseJson['obj1'].length);
    result: 1
    print(responseJson['obj1']['list1'].length);   
    result 3