@rick427/react-native-face-verify

Face verification library for React Native. Opens the front camera, auto-captures after a countdown, runs native ML Kit quality checks on the captured photo, then compares it against a reference image via AWS Rekognition or your own backend endpoint.

Same design language as @rick427/react-native-liveness — SVG circle overlay, rotating corner brackets, ripple pulse animation, countdown bubble.

---

How it works

Camera opens (front)
  → 1.2 s stabilisation delay
  → Countdown (3 → 2 → 1)
  → Auto-capture (takePhoto)
  → Native quality check: brightness + sharpness + face detection
      ↳ Too dark  → reset, show feedback, retry countdown
      ↳ Blurry    → reset, show feedback, retry countdown
  → Convert photo to base64
  → Compare via endpoint or AWS Rekognition
  → White ripple during comparison
  → Green border  →  onMatch()    (same person)
  → Red border    →  onNoMatch()  (different person / no match)

Quality checks (on captured photo)

Check	Threshold	Reject reason
Average luminance	< 40	too_dark
Laplacian variance (sharpness)	< 60	blurry
ML Kit face present	no face	no_face
Head pose (yaw/pitch)	> 25°	bad_pose

---

Installation

yarn add @rick427/react-native-face-verify

Peer dependencies

Install these if not already present:

yarn add react-native-vision-camera \
         react-native-reanimated \
         react-native-svg

iOS

cd ios && pod install

Add camera permission to Info.plist:

<key>NSCameraUsageDescription</key>
<string>Required for face verification</string>

Android

Add camera permission to AndroidManifest.xml:

<uses-permission android:name="android.permission.CAMERA" />

---

Usage

Drop-in modal (recommended)

import { useState } from 'react';
import { FaceVerifyModal } from '@rick427/react-native-face-verify';
import type { VerifyResult } from '@rick427/react-native-face-verify';

export default function MyScreen() {
  const [showVerify, setShowVerify] = useState(false);

  const handleMatch = (result: VerifyResult) => {
    console.log('Match! Similarity:', result.similarity);
    setShowVerify(false);
  };

  const handleNoMatch = (result: VerifyResult) => {
    console.log('No match. Similarity:', result.similarity);
    setShowVerify(false);
  };

  return (
    <>
      <Button title="Verify Identity" onPress={() => setShowVerify(true)} />

      <FaceVerifyModal
        visible={showVerify}
        onClose={() => setShowVerify(false)}
        referenceImage={base64String}
        endpoint={{ url: 'https://api.example.com/compare' }}
        onMatch={handleMatch}
        onNoMatch={handleNoMatch}
      />
    </>
  );
}

Inline component

import { FaceVerify } from '@rick427/react-native-face-verify';

<FaceVerify
  style={{ flex: 1 }}
  referenceImage={base64String}
  endpoint={{ url: 'https://api.example.com/compare' }}
  onMatch={(result) => console.log(result)}
  onNoMatch={(result) => console.log(result)}
  onError={(err) => console.error(err)}
/>

Hook (custom UI)

import { useFaceVerify } from '@rick427/react-native-face-verify';

const { faceVerifyState, feedback, countdown } = useFaceVerify({
  referenceImage,
  endpoint: { url: 'https://api.example.com/compare' },
  countdownFrom: 3,
  soundEnabled: true,
  cameraRef,
  onMatch,
  onNoMatch,
  onError,
});

---

Comparison paths

Path A — Your backend (recommended for production)

Pass an endpoint object. The library POSTs both images to your server, which proxies the comparison service (AWS Rekognition, Azure Face, DeepFace, etc). Your IAM credentials stay on the server and never touch the device.

<FaceVerifyModal
  referenceImage={base64}
  endpoint={{
    url: 'https://api.yourserver.com/compare-faces',
    headers: { Authorization: `Bearer ${token}` },
  }}
  onMatch={...}
  onNoMatch={...}
/>

Expected POST body your server receives:

{ "referenceImage": "base64...", "capturedImage": "base64..." }

Expected response from your server:

{ "match": true, "similarity": 98.5 }

When both endpoint and awsConfig are supplied, endpoint always takes priority.

---

Path B — AWS Rekognition direct (local testing only)

🚨 WARNING — DO NOT USE IN PRODUCTION

awsConfig embeds your AWS Access Key ID and Secret Access Key directly inside the app bundle. Anyone who decompiles your app can extract these credentials and use them to rack up charges or access your AWS account.

This path exists only for local development and testing. Before you ship to the App Store or Play Store, switch to Path A and move your credentials to a backend server.

<FaceVerifyModal
  referenceImage={base64}
  awsConfig={{
    accessKeyId: 'AKIA...',       // ← never commit or ship these
    secretAccessKey: '...',       // ← never commit or ship these
    region: 'us-east-1',
    similarityThreshold: 80,
  }}
  onMatch={...}
  onNoMatch={...}
/>

The library calls CompareFaces directly using pure-JS AWS Signature V4 signing — no AWS SDK required. Only used when endpoint is not provided.

---

API

FaceVerifyProps

Prop	Type	Default	Description
referenceImage	string	required	Base64-encoded reference image
endpoint	{ url: string; headers?: Record<string, string> }	—	Backend proxy config
awsConfig	AwsConfig	—	Direct Rekognition config (takes priority)
onMatch	(result: VerifyResult) => void	required	Fires when faces match
onNoMatch	(result: VerifyResult) => void	required	Fires when faces do not match
onError	(error: Error) => void	—	Fires on camera, network, or config errors
countdownFrom	number	3	Countdown start value before auto-capture
soundEnabled	boolean	true	Shutter sound on capture
fontFamily	string	'Baloo-Medium'	Font for all text inside the component
style	ViewStyle	—	Root container style (FaceVerify only)

FaceVerifyModalProps

All FaceVerifyProps (except style) plus:

Prop	Type	Default	Description
visible	boolean	required	Controls modal visibility
onClose	() => void	required	Called on close button press or Android back
animationType	'slide' | 'fade' | 'none'	'slide'	Modal entrance animation
closeButtonStyle	ViewStyle	—	Override close button container styles
closeButtonIconColor	string	'#fff'	× icon colour
closeButtonIconSize	number	18	× icon size in dp

VerifyResult

type VerifyResult = {
  match: boolean;
  similarity: number;     // 0–100
  capturedImage: string;  // base64-encoded JPEG of the captured photo
  timestamp: number;      // Unix ms
};

AwsConfig

type AwsConfig = {
  accessKeyId: string;
  secretAccessKey: string;
  region: string;
  similarityThreshold?: number;  // default: 80
};

---

State machine

State	Border colour	Description
ready	White	Camera open, countdown running
capturing	White	Taking photo (brief flash)
comparing	White + ripple pulse	Quality check + comparison in flight
match	Green	Same person confirmed
no_match	Red	Different person or below threshold
error	Red	Camera, network, or config failure

---

Native modules

Quality checks run natively on the captured photo — not on every camera frame — so no frame processor or worklets are needed.

iOS: FaceVerifyModule.swift — computes average luma (brightness), Laplacian variance (sharpness) on the captured UIImage, then runs ML Kit FaceDetector for face presence and head-pose check.

Android: FaceVerifyModule.kt — same logic via BitmapFactory + ML Kit FaceDetector.

Both platforms resolve a promise with { passed: boolean, reason?: string } which useFaceVerify uses to decide whether to retry the countdown or proceed with the comparison.

---

License

MIT License

Copyright (c) 2026 Richard Njoku

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.