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1. Define the custom object class with the fields that match the JSON structure.
2. Use the fromJson method to convert the JSON string to the list of custom objects.
3. Retrieve the JSON string from shared preferences.
4. Convert the JSON string to a list of custom objects using the fromJson method.

Here is an example implementation:

class CustomObject {
  String field1;
  int field2;

  CustomObject({this.field1, this.field2});

  factory CustomObject.fromJson(Map<String, dynamic> json) {
    return CustomObject(
      field1: json['field1'],
      field2: json['field2'],
    );
  }

  Map<String, dynamic> toJson() => {
        'field1': field1,
        'field2': field2,
      };
}

// Retrieve the saved JSON string from shared preferences
final prefs = await SharedPreferences.getInstance();
final jsonString = prefs.getString('customObjects');

// Convert the JSON string to a list of custom objects
final List<dynamic> jsonList = jsonDecode(jsonString);
final List<CustomObject> customObjects = jsonList.map((e) => CustomObject.fromJson(e)).toList();

Note: This example assumes that the saved JSON string is valid and contains a list of custom objects that follow the defined structure. You should include error handling in your implementation to handle cases where the JSON string is invalid or the mapping fails.