未处理的异常：将 object 转换为可编码的 object 失败：“TextEditingController”实例

Question

I got this error when I tried to send data to an API endpoint in Flutter. I don't seem to understand where the error is coming from.

Here is my data:

     var data = {
      'first_name': widget.first_name.toString(),
      'last_name': widget.last_name.toString(),
      'username': username.text,
      'email': widget.email.toString(),
      'mobile_number': widget.mobile_number.toString(),
      'password': password.text,
      'gender': gender,
      'repeat_password': repeat_password.text,
      'dob': dob,
      'accepted_terms': 'on'
    };

Answer 1

Here, If value contains objects that are not directly encodable to a JSON string (a value that is not a number , boolean , string , null , list or a map with string keys ), the toEncodable function is used to convert it to an object that must be directly encodable .

const data = {};
final String jsonString = jsonEncode(data);
print(jsonString);