To display only one data using FutureBuilder<List>, you can modify the builder method of the FutureBuilder widget to return a single widget instead of a list. Here’s an

Step -1

 body: new FutureBuilder<List>(
          future: authServices.getUserProfile(),
          builder: (context, snapshot) {
            if (snapshot.hasError) print(snapshot.error);
            print("yaha tak data");
            print(snapshot.data);
            if (snapshot.hasData) {
              // Only display the first item in the list
              var data = snapshot.data[0];
              // return Text(data.toString());
              return ItemList(list: snapshot.data);
            } else {
              return new Center(
                child: new CircularProgressIndicator(),
              );
            }
          },
        ));

Step -2

To display only the first item of data in the ItemList widget, you can modify the itemCount property of ListView.builder to 1 instead of list.length. Then, you can access the first item in the list using list[0] instead of list[i]. Here’s an updated version of the ItemList widget:

// ignore: must_be_immutable
class ItemList extends StatelessWidget {
  List list;
  ItemList({this.list});
  @override
  Widget build(BuildContext context) {
    return new ListView.builder(
        itemCount: 1, // Only display the first item in the list
        itemBuilder: (context, index) {
          var data = list[0];
          return new Container(
            padding: const EdgeInsets.all(10.0),
            child: new Card(
                child: new ListTile(
              title: new Text('Username: ${data['email']}',
                  style: TextStyle(
                    fontSize: 17.0,
                    color: Colors.black,
                  )),
              subtitle: Column(
                mainAxisAlignment: MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.start,
                textDirection: TextDirection.ltr,
                children: <Widget>[
                  new Text('Name :${data['name']}',
                      style: TextStyle(
                        fontSize: 20.0,
                        color: Colors.black,
                      )),
                  new Text('Email Id: ${data['email']}',
                      style: TextStyle(
                        fontSize: 17.0,
                        color: Colors.black,
                      )),
                  new Text('Country of residence : ${data['country']}',
                      style: TextStyle(
                        fontSize: 20.0,
                        color: Colors.black,
                      )),
                  new Text('Phone Number : ${data['phone']}',
                      style: TextStyle(
                        fontSize: 20.0,
                        color: Colors.black,
                      )),
                ],
              ),
            )),
          );
        });
  }
}

In the Profile widget, you can replace return Text(data.toString()); with return ItemList(list: snapshot.data); to display the ItemList widget instead of just the text representation of the first item in the list.