Mutual conversion between Flutter string and json

For example: the data to be transmitted is

var date = {
  "name":"lisi",
  "sex":"nan",
  "address":"henan"
};

 

import 'dart:convert' as convert;

//transfer string

String str = convert.jsonEncode(date);

//transfer to json

Map<String, dynamic> date =convert.jsonDecode(str );