How to Consume REST API Using Dio Package in Flutter | Flutter REST API Tutorial

How to Consume REST API Using Dio Package in Flutter | Flutter REST API Tutorial

In this step-by-step Flutter tutorial, you’ll learn **how to consume a REST API using the Dio package**—one of the most powerful HTTP clients for Flutter and Dart. Whether you’re building a mobile app that fetches data from a server, sends form submissions, or integrates with external APIs, Dio makes HTTP requests easier, faster, and more reliable.

We’ll walk through everything from *installing Dio* to *making GET and POST requests**, handling errors, sending headers, and even parsing JSON responses. This is perfect for **Flutter beginners* as well as *experienced developers* looking for a robust alternative to the default `http` package.

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🛠️ *What You’ll Learn:*

How to install and import the Dio package in Flutter
How to make GET requests to fetch data from an API
How to make POST requests to send data
How to handle query parameters and custom headers
How to parse JSON responses into Dart models
How to handle errors and exceptions in Dio
Pro tips for structuring your API calls in Flutter

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📌 *Step 1: Install Dio*
In your `pubspec.yaml` file, add:

```yaml
dependencies:
dio: ^5.0.0
```

Then run:

```bash
flutter pub get
```

---

📌 *Step 2: Import Dio and Make a GET Request*

```dart
import 'package:dio/dio.dart';

void fetchData() async {
try {
var response = await Dio().get('https://jsonplaceholder.typicode.com/...
print(response.data);
} catch (e) {
print(e);
}
}
```

---

📌 *Step 3: Make a POST Request*

```dart
void sendData() async {
try {
var response = await Dio().post(
'https://jsonplaceholder.typicode.com/...,
data: {'title': 'New Post', 'body': 'Post Content', 'userId': 1},
);
print(response.data);
} catch (e) {
print(e);
}
}
```

---

📌 *Step 4: Add Headers & Query Parameters*

```dart
var dio = Dio();
dio.options.headers['Authorization'] = 'Bearer YOUR_TOKEN';
var response = await dio.get('https://api.example.com/data', queryParameters: {'page': 1});
```

---

💡 *Pro Tips:*

Always use `try-catch` for network calls to handle timeouts and server errors.
Create a separate API service class for better code organization.
Use interceptors in Dio for logging requests and responses.
Combine Dio with `json_serializable` to generate model classes automatically.

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