convert JSON to ListView.builder in flutter

try my code

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';


void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: Test(),
    );
  }
}

class Test extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: FutureBuilder(
        future: http.get('https://dc-apps.net/map/services.json'),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(child: CircularProgressIndicator());
          }
          List data = json.decode(snapshot.data.body);
          // print(data);
          List categoriesnames = [];
          List stores = [];
          data.forEach((element) {
            categoriesnames.add(element["Category"]);
            stores.add(element['stores']);
          });

          // return Text('see');
          return ListView.builder(
            itemCount: data.length,
            itemBuilder: (context, index) {
              //      print(stores[index][index]['name']);
              return CardItem(
                categoryname: categoriesnames[index],
                sotories: stores[index],
              );
            },
          );
        },
      ),
    );
  }
}

class CardItem extends StatelessWidget {
  final String categoryname;
  List sotories;
  CardItem({this.categoryname, this.sotories});
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Expanded(
        child: Column(
          children: [
            Text(categoryname),
            SizedBox(
              height: 5,
            ),
            ListView.builder(
              scrollDirection: Axis.vertical,
              shrinkWrap: true,
              itemCount: sotories.length,
              itemBuilder: (context, index) => ListTile(
                title: Text(sotories[index]['name']),
                subtitle: Column(
                  children: [
                    Text(sotories[index]['phone_1']),
                    Text(sotories[index]['phone_2']),
                  ],
                ),
                trailing: CircleAvatar(
                  radius: 50,
                  backgroundImage: NetworkImage(sotories[index]['logo_url']),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}