您需要对该字符串使用jsonDecode，如下所示：

var response = {authToken: msadnmsandnasdn....};
var result = jsonDecode(response);

您可以使用各种操作操作来手动执行此操作：

import 'dart:convert';
void main() {
  var s = "{authToken: msadnmsandnasdn, name:risheek}";
  
  var kv = s.substring(0,s.length-1).substring(1).split(",");
  final Map<String, String> pairs = {};
  
  for (int i=0; i < kv.length;i++){
    var thisKV = kv[i].split(":");
    pairs[thisKV[0]] =thisKV[1].trim();
  }
  
  var encoded = json.encode(pairs);
  print(encoded);
}

输出量：

{"authToken":"msadnmsandnasdn"," name":"risheek"}