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Experiment 9 - Part A: Fetch Data from a REST API in Dart

Aim

To fetch data from a REST API in Dart.

Objective

To understand how to fetch data from a REST API in Dart using the http package.

System Requirements

  • Dart SDK: version 2.12.0 or higher
  • IDE: Visual Studio Code (latest version) or any text editor
  • Operating System: Windows (7 or higher), macOS (10.12 or higher), or Linux (Ubuntu, Debian, Fedora, CentOS, or similar)

Procedure

  1. Create a new Dart console project by running the following command in your terminal:

    dart create console_app

    The command creates a Dart project directory called console_app that contains a simple demo app in the \bin directory.

  2. Change to the Dart project directory.

    cd console_app

  3. Add the http package to your project by adding the following dependency to the pubspec.yaml file:

    dependencies:
  http: ^1.2.2

    Save the file.

  4. Run the following command to get the dependencies:

    dart pub get

    This command downloads the http package and adds it to your project.

  5. Create a new Dart file called git_hub_api.dart in the lib directory of your project.

  6. Add the following code to the git_hub_api.dart file:

    // Utilizing GitHub API service
import 'package:http/http.dart' as http;
import 'dart:convert';

Future<List<dynamic>> fetchRepos(String username) async {
  final response = await http.get(Uri.parse('https://api.github.com/users/$username/repos'));
  if (response.statusCode == 200) {
    return json.decode(response.body);
  } else {
    throw Exception('Failed to load repos');
  }
}

  7. Open the bin/console_app.dart file in your Dart project.

  8. Replace the existing code with the following code snippet:

    // Utilizing GitHub API service from console_app
import 'package:console_app/git_hub_api.dart' as git_hub_api;
import 'dart:io';

void main(List<String> arguments) async {
  String? username = arguments.isNotEmpty ? arguments.first : null;

  if (username == null) {
    stdout.write('Enter GitHub username: ');
    username = stdin.readLineSync();
  }

  if (username != null && username.isNotEmpty) {
    try {
      print('Fetching repositories for user: $username');
      List<dynamic> repos = await git_hub_api.fetchRepos(username);
      // Sort by 'updated_at' in descending order
      repos.sort(
        (a, b) => DateTime.parse(b['updated_at']).compareTo(
          DateTime.parse(a['updated_at']),
        ),
      );
      print('First 5 recent repositories:');
      for (var repo in repos.take(5)) {
        print(repo['name']);
      }
    } catch (e) {
      print('Error: $e');
    }
  } else {
    print('Username cannot be empty');
  }
}

  9. Save the file.

  10. Run your Dart project using the following command:

    dart run

Output

C:\path\to\console_app> dart run             
Building package executable... 
Built exp_9_a:exp_9_a.
Enter GitHub username: srinu2003
Fetching repositories for user: srinu2003
First 5 recent repositories:
Flutter-Lab
217Y1A05C0-ML-Lab
LaTex-Resume
FSD-Lab
learning-dashboard
C:\path\to\console_app>

command line arguments

C:\path\to\console_app> dart run .\bin\console_app.dart srinu2003
Fetching repositories for user: srinu2003
First 5 recent repositories:
Flutter-Lab
217Y1A05C0-ML-Lab
LaTex-Resume
FSD-Lab
learning-dashboard
C:\path\to\console_app>

Conclusion

We have successfully fetched data from a REST API in Dart using the http package.

References