// socket listener
ServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, port).then((ServerSocket socket) {
  print("Socket server is running on "
      "'http://${socket.address.address}:$port/'");
  socket.listen((Socket clientSocket) {
    socket.transform(UTF8.decoder).listen(handleServerSocket);
  });
});

void handleServerSocket (Socket clientSocket) {
  clientSocket
    .map((string)=> JSON.decode(string))
    .listen((json) {
    // The JSON object should contain a 'echo' entry for testing.
    var echo = json['echo'];
    print("Socket Server: Message to be echoed: $echo");
    var response='{"response": "$echo"}';
    clientSocket.write(response);
    }, onError: (error) {
    print('Bad Socket request');
  });

}

import 'dart:io';
import 'dart:convert' show JSON;
import 'dart:convert' show UTF8;

main() {
  ServerSocket.bind('127.0.0.1', 4041)
    .then((serverSocket) {
      print('connected');
      serverSocket.listen((socket) {
        socket.transform(UTF8.decoder).listen(jsonprint);
      });
    });
}

jsonprint(String listAsJson){
  print('received $listAsJson');
  List parsedList = JSON.decode(listAsJson);
  print('list: $parsedList');
}


import 'dart:io';
import 'dart:convert' show JSON;
import 'dart:convert' show UTF8;

main() {
  Socket.connect('127.0.0.1', 4041).then((socket) {
    String listAsJson = '["Dart",1.0]'; // input List of data
    List list = JSON.decode(listAsJson);
    print('sending $list');
    socket.write(JSON.encode(list));
  });
}