dependencies:
  http: ^0.13.5

flutter pub get

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

void fetchData() async {
  final url = Uri.parse('https://jsonplaceholder.typicode.com/posts/1');
  final response = await http.get(url);
  if (response.statusCode == 200) {
    final data = jsonDecode(response.body);
    print("Title: \${data['title']}");
  }
}

void sendData() async {
  final url = Uri.parse('https://jsonplaceholder.typicode.com/posts');
  final response = await http.post(
    url,
    headers: {"Content-Type": "application/json"},
    body: jsonEncode({"title": "Hello", "body": "เนื้อหา", "userId": 1}),
  );

  if (response.statusCode == 201) {
    final data = jsonDecode(response.body);
    print("สร้างโพสต์ใหม่ ID: \${data['id']}");
  }
}

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(home: ApiExample());
  }
}

class ApiExample extends StatefulWidget {
  @override
  _ApiExampleState createState() => _ApiExampleState();
}

class _ApiExampleState extends State<ApiExample> {
  String result = "กำลังโหลด...";

  @override
  void initState() {
    super.initState();
    fetchData();
  }

  void fetchData() async {
    final url = Uri.parse('https://jsonplaceholder.typicode.com/posts/1');
    final response = await http.get(url);
    if (response.statusCode == 200) {
      final data = jsonDecode(response.body);
      setState(() {
        result = data['title'];
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("ดึงข้อมูลจาก API")),
      body: Center(child: Text(result)),
    );
  }
}