[TUTORIAL] Cara menghubungkan (Integrasi) Flutter dan Node.js dengan API

dependencies:
  flutter:
    sdk: flutter
  http: ^0.13.3

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

void main() {
  runApp(MyApp());
  fetchData(); // Panggil fetchData di sini jika perlu
}

void fetchData() async {
  final response = await http.get(Uri.parse('https://httpbin.org/get'));
  if (response.statusCode == 200) {
    // Proses data dari response.body
    print(response.body);
  } else {
    // Tangani kesalahan
    print('Error: ${response.statusCode}');
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Future<List<dynamic>> fetchItems() async {
    try {
      final response = await http.get(Uri.parse('http://localhost:3000/items'));

      if (response.statusCode == 200) {
        return json.decode(response.body);
      } else {
        throw Exception('Failed to load items: ${response.statusCode}');
      }
    } catch (error) {
      throw Exception('Failed to load items: $error');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter CRUD Example'),
      ),
      body: FutureBuilder<List<dynamic>>(
        future: fetchItems(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return CircularProgressIndicator();
          } else if (snapshot.hasError) {
            return Text('Error: ${snapshot.error}');
          } else {
            List<dynamic> items = snapshot.data!;
            return ListView.builder(
              itemCount: items.length,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(items[index]['name']),
                );
              },
            );
          }
        },
      ),
    );
  }
}

const express = require("express");
const http = require("http");
const axios = require("axios");

const app = express();

// Bagian Express
app.get("/api/data", (req, res) => {
  // Kirim data sebagai respons
  res.json({ message: "Hello from the API!" });
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

// Bagian HTTP Request
const options = {
  hostname: "example.com",
  port: 80,
  path: "/api/data",
  method: "GET",
};

const req = http.request(options, (res) => {
  let data = "";

  res.on("data", (chunk) => {
    data += chunk;
  });

  res.on("end", () => {
    // Proses data dari 'data'
    console.log(data);
  });
});

req.on("error", (error) => {
  console.error(`Error: ${error.message}`);
});

req.end();

// Bagian Axios
axios
  .get("https://httpbin.org/get")
  .then((response) => {
    // Proses data dari response.data
    console.log(response.data);
  })
  .catch((error) => {
    // Tangani kesalahan
    console.error(`Error: ${error.message}`);
  });

// Menambahkan CORS (Cross-Origin Resource Sharing)
app.use((req, res, next) => {
  res.setHeader(
    "Access-Control-Allow-Origin",
    "http://localhost:your_flutter_port"
  );
  res.setHeader(
    "Access-Control-Allow-Methods",
    "GET, POST, OPTIONS, PUT, PATCH, DELETE"
  );
  res.setHeader(
    "Access-Control-Allow-Headers",
    "X-Requested-With,content-type"
  );
  res.setHeader("Access-Control-Allow-Credentials", true);
  next();
});