Fingerprint Dart Auth SDK

Backend-oriented FingerprintJS helper SDK for Dart.

This package focuses on server-side verification and FingerprintJS Pro API integration. It exposes:

  • FingerprintJsServerApiClient for integration metadata, verification, and visitor lookups
  • FingerprintAuth for simple verification requests
  • webhook signature validation via isValidWebhookSignature(...)
  • typed response and filter models for events, visitors, and webhook payloads

Installation

dependencies:
  fingerprint_dart_auth_sdk: ^0.0.5

Then run:

dart pub get

Preferred Initialization

import 'package:fingerprint_dart_auth_sdk/fingerprint_dart_auth_sdk.dart';

Future<void> main() async {
  final client = FingerprintJsServerApiClient(
    apiKey: 'your-fingerprint-secret-key',
    region: Region.us,
  );

  final integration = await client.getIntegrationInfo();
  print(integration);
}

Common Operations

Verify a payload

final auth = FingerprintAuth(apiKey: 'your-fingerprint-secret-key');

final response = await auth.verify('{"requestId":"req_123"}');
print(response);

Fetch visitor data

final client = FingerprintJsServerApiClient(
  apiKey: 'your-fingerprint-secret-key',
);

final visitor = await client.getVisitorData('visitor_id');
print(visitor);

Validate webhook signatures

final isValid = isValidWebhookSignature(
  payload: rawBody,
  signature: webhookSignature,
  secret: webhookSecret,
);

print(isValid);

Package Layout

  • lib/src/api/ contains the FingerprintJS API clients and SDK error types
  • lib/src/types/ contains typed event, visitor, filter, and error models
  • lib/src/utils/ contains webhook, retry, path, and integration helpers
  • example/ contains sample integrations for Flutter and web consumers

Security Guidance

  • Keep Fingerprint secret API keys and webhook secrets on trusted backends.
  • Validate webhook signatures before processing payloads.
  • Treat visitor/event data as sensitive operational data and log it sparingly.

Examples

See the example/ directory for maintained sample projects and integration references.

Libraries

fingerprint_dart_auth_sdk