How to implement biometric login in Flutter using this project?

Clone or fork the Flutter Login project, then follow the platform-specific setup instructions in the README to enable biometric authentication. You'll need to update Info.plist for iOS with NSFaceIDUsageDescription and AndroidManifest.xml with USE_FINGERPRINT permission.

Flutter Login vs Firebase Auth: which is better for my app?

Flutter Login is ideal for learning or custom authentication flows with full control over the backend, while Firebase Auth offers quicker setup with managed services, social logins, and regular updates. Choose based on your need for customization versus convenience.

Can I customize the UI themes in Flutter Login?

Yes, the project includes customizable theming and dark mode with true black options, allowing you to modify colors and layouts. Since it's an example to fork, you can directly edit the UI code to match your design requirements.

Does Flutter Login support social media logins like Google or Facebook?

No, the current implementation focuses on biometric and JSON API-based authentication. You would need to extend the code or integrate additional packages for social logins, as it's not included out of the box.

How does Flutter Login handle session management and auto-login?

It implements sticky authentication and remember me features using persistent storage, with options to retry authentication when the app resumes. The README mentions setting stickyAuth to true for handling interruptions like phone calls.

Is Flutter Login suitable for production use in commercial apps?

Yes, it's designed as a production-ready example with security features like biometrics and JSON integration. However, you should thoroughly test and adapt it for your specific backend, as it's not a maintained library with ongoing support.

Open-Awesome

Login

Dart1.0.0

A complete Flutter login example with biometric authentication, dark mode, and JSON API integration.

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713 stars197 forks0 contributors

What is Login?

Flutter Login is an open-source example project that demonstrates how to implement a complete authentication system for Flutter apps. It includes login with biometrics (FaceID, TouchID, fingerprint), dark mode, JSON API integration, and a settings page. The project solves the problem of building a secure, polished login flow from scratch by providing a reusable module.

Target Audience

Flutter developers building cross-platform mobile apps who need a ready-to-use authentication system with modern features like biometric login and dark mode.

Value Proposition

Developers choose Flutter Login because it offers a production-ready, fully-featured login example with 100% shared code between Android and iOS, reducing development time and ensuring best practices for authentication in Flutter.

Overview

100% Shared Code Android/iOS Login Example - JSON API

Use Cases

Best For

Learning Flutter authentication patterns with biometric login
Forking a complete login module for new Flutter projects
Implementing dark mode and custom themes in authentication flows
Integrating JSON REST APIs with automatic serialization in Flutter
Adding sticky session management with auto-login features
Building cross-platform mobile apps with shared Android/iOS code

Not Ideal For

Projects requiring a managed authentication backend like Firebase or Auth0
Teams needing extensive social login options (e.g., Google, Facebook) out of the box
Apps where minimal setup and drop-in components are prioritized over customization
Developers who prefer using regularly updated, modular libraries rather than forking example code

Pros & Cons

Pros

Biometric Authentication Support

Implements FaceID, TouchID, and fingerprint login on both iOS and Android, with sticky auth options to handle app backgrounding, as detailed in the README's platform integration sections.

Complete Authentication Flow

Includes auto-login, remember me toggle, settings page, and dark mode, providing a full-featured module ready for customization, evidenced by the features list and screenshots.

Cross-Platform Code Sharing

Uses 100% shared code between Android and iOS, leveraging Flutter's capabilities for efficient development, as stated in the README's description.

JSON API Integration

Utilizes json_serializable for automatic JSON parsing with REST APIs, simplifying data handling, which is highlighted in the features and getting started sections.

Cons

Platform-Specific Setup Required

Requires manual updates to Info.plist for iOS and AndroidManifest.xml for Android to enable biometric features, adding complexity and potential for errors, as noted in the README.

Not a Maintained Library

As an example project, it lacks regular updates and dedicated support compared to established authentication packages, which could lead to compatibility issues with newer Flutter versions.

Limited Modularity

Designed to be forked and adapted, making it challenging to integrate into existing projects without significant refactoring, as it's not packaged as a reusable component.

Frequently Asked Questions

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