Biometrics authentication is a convenient way to validate user identity and provide secure access to applications. It is becoming increasingly popular in mobile apps due to the convenience and security it provides. In this article, we will look at how to implement biometrics authentication with Face ID and Fingerprint in Flutter.

![flutter biometrics face id](https:&#x2F;&#x2F;devbrite.io&#x2F;media&#x2F;cover9.jpg)
## Prerequisites
Before getting started, you should have a basic understanding of Flutter and the concepts of authentication. Additionally, you will need to have the latest version of the Flutter SDK installed.

## Creating a Flutter Project
Let&#x27;s start by creating a new Flutter project. Open the terminal, navigate to a suitable directory, and enter the following command:

&#96;&#96;&#96;
flutter create biometrics_auth
&#96;&#96;&#96;

This will create a new Flutter project with the name &#96;biometrics_auth&#96;.

## Installing The Dependencies
Next, we need to install the &#96;local_auth&#96; package, which will enable us to use biometrics authentication in our Flutter app. To install it, open the &#96;pubspec.yaml&#96; file and add the following line:

&#96;&#96;&#96;
dependencies:
  local_auth: ^0.6.2
&#96;&#96;&#96;

Then, run the following command in the terminal to install the package:

&#96;&#96;&#96;
flutter pub get
&#96;&#96;&#96;

## Getting Face ID and Fingerprint Permissions in Flutter
We need to request permission from the user to use Face ID and Fingerprint authentication. To do this, we need to use the &#96;LocalAuthentication&#96; class, which is part of the &#96;local_auth&#96; package.

First, we need to create an instance of the &#96;LocalAuthentication&#96; class. We can do this by calling the &#96;LocalAuthentication.instance&#96; method:

&#96;&#96;&#96;dart
final localAuth = LocalAuthentication.instance;
&#96;&#96;&#96;

Next, we need to call the &#96;authenticateWithBiometrics&#96; method, which will prompt the user to provide permission to use Face ID or Fingerprint authentication. This method takes a &#96;BiometricAuthenticationRequest&#96; object as an argument, which we can create using the &#96;BiometricAuthenticationRequest.withProtectionLevel&#96; constructor:

&#96;&#96;&#96;dart
BiometricAuthenticationRequest request = 
  BiometricAuthenticationRequest.withProtectionLevel(
    BiometricProtectionLevel.encryption,
);

&#96;&#96;&#96;

The &#96;BiometricProtectionLevel.encryption&#96; argument specifies that the user data should be encrypted when stored on the device.

Finally, we can call the &#96;authenticateWithBiometrics&#96; method, passing in the &#96;request&#96; object:

&#96;&#96;&#96;dart
bool authenticated = 
  await localAuth.authenticateWithBiometrics(request);
&#96;&#96;&#96;

This method will return a boolean value indicating whether the user has granted permission to use Face ID or Fingerprint authentication.

## How to Use Biometrics in Flutter
Once we have permission to use biometrics authentication, we can use the &#96;authenticateWithBiometrics&#96; method to authenticate the user. This method takes a &#96;BiometricAuthenticationRequest&#96; object as an argument, which we can create using the &#96;BiometricAuthenticationRequest.withProtectionLevel&#96; constructor:

&#96;&#96;&#96;dart
BiometricAuthenticationRequest request = 
  BiometricAuthenticationRequest.withProtectionLevel(
    BiometricProtectionLevel.encryption,
);
&#96;&#96;&#96;

The &#96;BiometricProtectionLevel.encryption&#96; argument specifies that the user data should be encrypted when stored on the device.

Next, we can call the &#96;authenticateWithBiometrics&#96; method, passing in the &#96;request&#96; object:

&#96;&#96;&#96;dart
bool authenticated = 
  await localAuth.authenticateWithBiometrics(request);
&#96;&#96;&#96;

This method will return a boolean value indicating whether the user has been successfully authenticated.

## Conclusion
In this article, we looked at how to implement biometrics authentication with Face ID and Fingerprint in Flutter. We discussed the prerequisites and how to get permission from the user to use biometrics authentication. We also looked at how to authenticate the user with biometrics.

Biometrics Authentication with Face ID and Fingerprint in Flutter

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