API Error Monitor #

A Dart/Flutter package that automatically detects and reports API response parsing errors, including type mismatches and missing keys, with Discord webhook integration.

Features #

• 🔍 Automatic Error Detection: Intercepts API requests and automatically detects parsing errors
• 🎯 Type Mismatch Detection: Identifies when JSON values don't match expected data types
• 🔑 Missing Key Detection: Detects when required JSON keys are missing
• 📱 Discord Integration: Sends error reports to Discord webhooks
• 💾 Local Logging: Saves error reports to local files for offline scenarios
• 🔄 Retry Mechanism: Automatically retries failed webhook requests
• 🛠️ Dio Support: Built-in interceptor for Dio HTTP client
• 🌐 HTTP Support: Wrapper class for the http package
• 🐛 Debug Mode Control: Configurable behavior in debug mode
• 📊 Error Analytics: Retrieve and analyze local error reports

Installation #

Add this to your package's pubspec.yaml file:

dependencies:
  api_error_monitor: ^0.0.1

Then run:

flutter pub get

Quick Start #

Basic Usage #

import 'package:api_error_monitor/api_error_monitor.dart';

// Initialize the error monitor
final errorMonitor = ApiErrorMonitor(
  appName: "MyApp",
  discordWebhookUrl: "https://discord.com/api/webhooks/xxxx",
);

// Capture an error manually
try {
  final model = MyModel.fromJson(response.data);
} catch (e, s) {
  errorMonitor.capture(
    e,
    stackTrace: s,
    endpoint: "/user/profile",
    responseData: response.data,
  );
}

Using with Dio #

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

final dio = Dio();

// Add the error monitoring interceptor
dio.addApiErrorMonitoring(
  errorMonitor: ApiErrorMonitor(
    appName: "MyApp",
    discordWebhookUrl: "https://discord.com/api/webhooks/xxxx",
  ),
);

// Make requests as usual
final response = await dio.get('/user/profile');
final user = UserModel.fromJson(response.data); // Errors will be automatically captured

Using with HTTP Package #

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

final errorMonitor = ApiErrorMonitor(
  appName: "MyApp",
  discordWebhookUrl: "https://discord.com/api/webhooks/xxxx",
);

final httpClient = ApiErrorHttpClient(
  errorMonitor: errorMonitor,
);

// Make requests with automatic error monitoring
final response = await httpClient.get(
  Uri.parse('https://api.example.com/user/profile'),
  fromJsonCallback: (data) {
    return UserModel.fromJson(data);
  },
);

Configuration #

ApiErrorMonitor Options #

final errorMonitor = ApiErrorMonitor(
  appName: "MyApp",                    // Required: App name
  discordWebhookUrl: "https://...",     // Optional: Discord webhook URL
  enableInDebugMode: false,             // Default: false (disabled in debug)
  enableLocalLogging: true,             // Default: true
  customLogDirectory: "/path/to/logs",  // Optional: Custom log directory
  maxRetries: 3,                        // Default: 3
  retryDelay: Duration(seconds: 5),     // Default: 5 seconds
  enabled: true,                        // Default: true
);

Configuration Object #

final config = ApiErrorMonitorConfig(
  appName: "MyApp",
  discordWebhookUrl: "https://discord.com/api/webhooks/xxxx",
  enableInDebugMode: false,
  enableLocalLogging: true,
  maxRetries: 3,
  retryDelay: Duration(seconds: 5),
  enabled: true,
);

final errorMonitor = ApiErrorMonitor.fromConfig(config);

Error Report Format #

Each error report contains the following information:

• App Name: Name of the app using the package
• Endpoint: Full API endpoint where the error occurred
• Key: The JSON key that caused the issue (if detected)
• Expected Type: The expected data type
• Received Type: The actual data type from the server
• Timestamp: When the error occurred
• Error Message: The error message
• Stack Trace: Stack trace for debugging (optional)
• Request Data: Request data (if available)
• Response Data: Response data (if available)

Discord Webhook Setup #

1. Go to your Discord server
2. Navigate to Server Settings > Integrations > Webhooks
3. Click "New Webhook"
4. Copy the webhook URL
5. Use it in your ApiErrorMonitor configuration

Example Discord webhook URL:

https://discord.com/api/webhooks/1234567890/abcdefghijklmnopqrstuvwxyz

Local Logging #

Error reports are automatically saved to local files when enableLocalLogging is enabled. By default, logs are stored in:

• iOS/Android: App documents directory (api_error_monitor/logs/)
• Custom: Use customLogDirectory to specify a custom path

Retrieve Local Reports #

final reports = await errorMonitor.getLocalReports();
for (final report in reports) {
  print('Error: ${report.errorMessage}');
  print('Endpoint: ${report.endpoint}');
  print('Key: ${report.key}');
}

Clear Local Reports #

await errorMonitor.clearLocalReports();

Get Log Directory Path #

final logPath = errorMonitor.getLocalLogDirectoryPath();
print('Logs stored at: $logPath');

Retry Mechanism #

Failed webhook requests are automatically queued and retried:

// Process queued reports (call when network is available)
await errorMonitor.processQueue();

// Check queue size
final queueSize = errorMonitor.queueSize;

// Clear queue
errorMonitor.clearQueue();

Advanced Usage #

Manual Error Capture #

errorMonitor.capture(
  error,
  stackTrace: stackTrace,
  endpoint: "/api/users",
  key: "email",                    // Optional: Specify the key
  expectedType: "String",          // Optional: Specify expected type
  receivedType: "int",             // Optional: Specify received type
  requestData: {"id": 123},        // Optional: Request data
  responseData: {"email": 123},    // Optional: Response data
);

Dio Interceptor with Custom Parsing #

dio.addApiErrorMonitoring(
  errorMonitor: errorMonitor,
  fromJsonCallback: (data) {
    // Custom parsing logic
    return MyModel.fromJson(data);
  },
);

HTTP Client with Custom Parsing #

final response = await httpClient.get(
  Uri.parse('https://api.example.com/user'),
  fromJsonCallback: (data) {
    return UserModel.fromJson(data);
  },
);

Error Patterns Detected #

The package automatically detects the following error patterns:

1. Type Mismatch: type 'X' is not a subtype of type 'Y'
2. Missing Key: key not found: "keyName"
3. Null Value: type 'null' is not a subtype of type 'String'
4. Cast Error: type 'X' is not a subtype of type 'Y' in type cast
5. JSON Path: Extracts keys from JSON path errors

Debug Mode #

By default, error reporting is disabled in debug mode. To enable it:

final errorMonitor = ApiErrorMonitor(
  appName: "MyApp",
  discordWebhookUrl: "https://discord.com/api/webhooks/xxxx",
  enableInDebugMode: true, // Enable in debug mode
);

Best Practices #

1. Use in Production: Disable error reporting in debug mode to avoid spam
2. Monitor Queue Size: Regularly check and process the retry queue
3. Clear Old Logs: Periodically clear old local logs to save storage
4. Webhook Security: Keep your Discord webhook URL secure
5. Error Handling: Always handle errors in your code, even with monitoring

Example App #

See the /example directory for a complete example application.

Contributing #

Contributions are welcome! Please feel free to submit a Pull Request.

License #

This project is licensed under the MIT License - see the LICENSE file for details.

Support #

For issues, questions, or contributions, please open an issue on GitHub.

Changelog #

See CHANGELOG.md for a list of changes.