sortJson function
Sorts a JSON object by keys
Implementation
String sortJson(String jsonString) {
// Decode JSON string into a Map
Map<String, dynamic> jsonMap = jsonDecode(jsonString);
// Sort the map by keys
var sortedKeys = jsonMap.keys.toList()..sort();
Map<String, dynamic> sortedJson = {
for (var key in sortedKeys) key: jsonMap[key]
};
// Convert back to a JSON string
return jsonEncode(sortedJson);
}