Developer SDK

Kill passwords with 3 lines of code

Drop in our SDK. Let your users authenticate with their face. No password databases. No reset flows. No breaches. Just authentication that works.

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Quick Start

Up and running in 5 minutes

Install the SDK

terminalbash

npm install @facein/sdk

Add the provider and authenticate

app/page.tsxtsx

import { FaceInProvider, useAuth } from '@facein/react';

function App() {
  return (
    <FaceInProvider apiKey="fi_live_...">
      <LoginPage />
    </FaceInProvider>
  );
}

function LoginPage() {
  const { authenticate, user, isLoading } = useAuth();

  if (user) return <Dashboard user={user} />;

  return (
    <button onClick={() => authenticate()}>
      Login with FaceIn
    </button>
  );
}

Verify on your backend

api/auth.tstypescript

// Verify a FaceIn authentication token
const response = await fetch('https://api.facein.id/v1/verify', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer fi_live_...',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    token: authToken,  // from client SDK
  }),
});

const { verified, user_id, confidence } = await response.json();
// { verified: true, user_id: "usr_abc123", confidence: 0.999 }

SDKs & Tools

Everything you need to go passwordless

⚛️

React / Next.js

First-class React hooks and components. Server-side session validation included.

📱

React Native

Native face detection with camera access. iOS and Android support.

🍎

Swift / Kotlin

Native SDKs for iOS and Android. Deep OS integration for biometric APIs.

🔗

REST API

Language-agnostic HTTP API. Works with any backend — Node, Python, Go, Rust.

🔔

Webhooks

Real-time event notifications. Auth success, failures, user lifecycle events.

📊

Admin Dashboard

Monitor auth events, manage users, configure security policies. Real-time analytics.

Real-time Events

Webhooks for everything

Get notified the instant something happens. Auth events, user lifecycle changes, security alerts — all delivered to your endpoint in real-time.

→auth.success — user authenticated
→auth.failed — authentication attempt failed
→user.enrolled — new user enrolled biometrics
→user.deleted — user removed their account
→security.anomaly — unusual pattern detected

webhook-config.jsonjson

// Configure webhook for auth events
// POST https://api.facein.id/v1/webhooks
{
  "url": "https://yourapp.com/webhooks/facein",
  "events": [
    "auth.success",
    "auth.failed",
    "user.enrolled",
    "user.deleted"
  ]
}

API Reference