Biometric

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API Reference:

Prompt the user for biometric authentication on Android and iOS.

Supported Platforms

This plugin requires a Rust version of at least 1.77.2

[TABLE]

Setup

Install the biometric plugin to get started.

• Automatic
• Manual

Use your project’s package manager to add the dependency:

• npm
• yarn
• pnpm
• deno
• bun
• cargo

npm run tauri add biometric

yarn run tauri add biometric

pnpm tauri add biometric

deno task tauri add biometric

bun tauri add biometric

cargo tauri add biometric

1. Run the following command in the src-tauri folder to add the plugin to the project’s dependencies in Cargo.toml:

   cargo add tauri-plugin-biometric --target 'cfg(any(target_os = "android", target_os = "ios"))'

2. Modify lib.rs to initialize the plugin:

   #[cfg_attr(mobile, tauri::mobile_entry_point)]pub fn run() {    tauri::Builder::default()        .setup(|app| {            #[cfg(mobile)]            app.handle().plugin(tauri_plugin_biometric::Builder::new().build());            Ok(())        })        .run(tauri::generate_context!())        .expect("error while running tauri application");}

   src-tauri/src/lib.rs

3. Install the JavaScript Guest bindings using your preferred JavaScript package manager:

   • npm
   • yarn
   • pnpm
   • deno
   • bun

   npm install @tauri-apps/plugin-biometric

   yarn add @tauri-apps/plugin-biometric

   pnpm add @tauri-apps/plugin-biometric

   deno add npm:@tauri-apps/plugin-biometric

   bun add @tauri-apps/plugin-biometric

Configuration

On iOS the biometric plugin requires the NSFaceIDUsageDescription information property list value, which should describe why your app needs to use biometric authentication.

In the src-tauri/Info.ios.plist file, add the following snippet:

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist version="1.0">  <dict>    <key>NSFaceIDUsageDescription</key>    <string>Authenticate with biometric</string>  </dict></plist>

src-tauri/Info.ios.plist

Usage

This plugin enables you to verify the availability of Biometric Authentication on a device, prompt the user for biometric authentication, and check the result to determine if the authentication was successful or not.

Check Status

You can check the status of Biometric Authentication, including its availability and the types of biometric authentication methods supported.

• JavaScript
• Rust

import { checkStatus } from '@tauri-apps/plugin-biometric';
const status = await checkStatus();if (status.isAvailable) {  console.log('Yes! Biometric Authentication is available');} else {  console.log(    'No! Biometric Authentication is not available due to ' + status.error  );}

use tauri_plugin_biometric::BiometricExt;
fn check_biometric(app_handle: tauri::AppHandle) {    let status = app_handle.biometric().status().unwrap();    if status.is_available {        println!("Yes! Biometric Authentication is available");    } else {        println!("No! Biometric Authentication is not available due to: {}", status.error.unwrap());    }}

Authenticate

To prompt the user for Biometric Authentication, utilize the authenticate() method.

• JavaScript
• Rust

import { authenticate } from '@tauri-apps/plugin-biometric';
const options = {  // Set true if you want the user to be able to authenticate using phone password  allowDeviceCredential: false,  cancelTitle: "Feature won't work if Canceled",
  // iOS only feature  fallbackTitle: 'Sorry, authentication failed',
  // Android only features  title: 'Tauri feature',  subtitle: 'Authenticate to access the locked Tauri function',  confirmationRequired: true,};
try {  await authenticate('This feature is locked', options);  console.log(    'Hooray! Successfully Authenticated! We can now perform the locked Tauri function!'  );} catch (err) {  console.log('Oh no! Authentication failed because ' + err.message);}

use tauri_plugin_biometric::{BiometricExt, AuthOptions};
fn bio_auth(app_handle: tauri::AppHandle) {
    let options = AuthOptions {        // Set True if you want the user to be able to authenticate using phone password        allow_device_credential:false,        cancel_title: Some("Feature won't work if Canceled".to_string()),
        // iOS only feature        fallback_title: Some("Sorry, authentication failed".to_string()),
        // Android only features        title: Some("Tauri feature".to_string()),        subtitle: Some("Authenticate to access the locked Tauri function".to_string()),        confirmation_required: Some(true),    };
    // if the authentication was successful, the function returns Result::Ok()    // otherwise returns Result::Error()    match app_handle.biometric().authenticate("This feature is locked".to_string(), options) {        Ok(_) => {            println!("Hooray! Successfully Authenticated! We can now perform the locked Tauri function!");        }        Err(e) => {            println!("Oh no! Authentication failed because : {e}");        }    }}

Permissions

By default all potentially dangerous plugin commands and scopes are blocked and cannot be accessed. You must modify the permissions in your capabilities configuration to enable these.

See the Capabilities Overview for more information and the step by step guide to use plugin permissions.

{  "$schema": "../gen/schemas/desktop-schema.json",  "identifier": "main-capability",  "description": "Capability for the main window",  "windows": ["main"],  "permissions": ["biometric:default"]}

src-tauri/capabilities/default.json

Default Permission

This permission set configures which biometric features are by default exposed.

Granted Permissions

It allows acccess to all biometric commands.

This default permission set includes the following:

• allow-authenticate
• allow-status

Permission Table

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© 2026 Tauri Contributors. CC-BY / MIT

Last updated Oct 08, 2026