I need OAuth for a React Native app

Sure — OAuth in a React Native app usually means:

1. Open the provider’s login/consent screen
2. Receive the redirect back into the app
3. Exchange the code for tokens
4. Use the token to call your API

Recommended approach

For React Native, the safest/common option is:

• Authorization Code Flow with PKCE
• Avoid the old implicit flow
• Use a system browser or in-app auth session, not a WebView

Good libraries

Depending on your setup:

• react-native-app-auth
  Great for OAuth/OIDC flows, very common choice.
• expo-auth-session
  Best if you’re using Expo.
• react-native-inappbrowser-reborn
  Useful for opening the auth URL in a secure browser session.

High-level flow

1. Register your app with the OAuth provider

You’ll need:

• client_id
• redirect URI, like:
  • myapp://oauthredirect
  • or an Expo redirect URI
• scopes, like openid profile email

2. Configure deep linking

Your app must handle the redirect URI.

iOS

Add a custom URL scheme in Info.plist

Android

Add an intent filter in AndroidManifest.xml

3. Start login

Generate:

• code_verifier
• code_challenge

Then open the authorization URL.

4. Handle redirect

The provider redirects to your app with:

• code
• state

5. Exchange code for tokens

Send the authorization code + PKCE verifier to the token endpoint.

6. Store tokens securely

Use:

• expo-secure-store
• react-native-keychain

Avoid plain AsyncStorage for sensitive tokens.

---

Example using react-native-app-auth

npm install react-native-app-auth

import { authorize } from 'react-native-app-auth';

const config = {
  issuer: 'https://accounts.google.com',
  clientId: 'YOUR_CLIENT_ID',
  redirectUrl: 'com.myapp:/oauthredirect',
  scopes: ['openid', 'profile', 'email'],
};

async function login() {
  try {
    const result = await authorize(config);
    console.log(result.accessToken);
    console.log(result.idToken);
  } catch (error) {
    console.error(error);
  }
}

---

If you use Expo

Use expo-auth-session instead.

npx expo install expo-auth-session

Then use AuthSession.startAsync() or the newer auth request hooks.

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Important security notes

• Use PKCE
• Do not put your client secret in the mobile app
• Do not use a WebView for OAuth unless the provider explicitly allows it
• Use secure token storage
• Validate state to prevent CSRF
• Prefer short-lived access tokens + refresh tokens if supported

---

If you want, I can help you with one of these next:

1. A complete React Native OAuth example
2. OAuth setup for Expo
3. OAuth setup for Google / Auth0 / Azure / GitHub
4. iOS + Android deep linking config
5. Backend token exchange flow

If you tell me your provider and whether you’re using Expo or bare React Native, I can give you the exact code.