Expo is a framework built on React Native that provides many out-of-the-box features, similar to NextJS for web but designed for mobile development. Para provides a @getpara/react-native-wallet@alpha package that works seamlessly in both React Native bare and Expo workflows, utilizing the device’s Native Passkeys for secure wallet management.

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Prerequisites

To use Para, you need an API key. This key authenticates your requests to Para services and is essential for integration.
Don’t have an API key yet? Request access to the Developer Portal to create API keys, manage billing, teams, and more.
To ensure passkey functionality works correctly:
  • Enable biometric or device unlock settings (fingerprint, face unlock, or PIN)
  • On Android sign in to a Google account on the device (required for Google Play Services passkey management)

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Dependency Installation

Install the required dependencies: 
npm install @getpara/react-native-wallet@alpha @react-native-async-storage/async-storage react-native-keychain react-native-modpow react-native-passkey react-native-quick-base64 @craftzdog/react-native-buffer react-native-quick-crypto expo-linking expo-web-browser --save-exact

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Project Setup

To use the @getpara/react-native-wallet@alpha package in your Expo project, you will need to do some initial project setup. For passkeys to work correctly we have to setup the Relying Party ID for both iOS and Android. This ensures passkeys are bound to the domains they were created for.
Your apps must be registered with Para to link the passkey to the correct domain. You can find this configuration options your Developer Portal under the ‘Configuration’ tab of the API key label as Native Passkey Configuration.

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Platform-Specific Configuration

Configure your app.json file to enable passkey functionality and secure communication:
app.json
{
  "expo": {
    "ios": {
      "bundleIdentifier": "your.app.bundleIdentifier",
      "associatedDomains": [
        "webcredentials:app.beta.usecapsule.com?mode=developer",
        "webcredentials:app.usecapsule.com"
      ]
    }
  }
}
Important: Your teamId + bundleIdentifier must be registered with the Para team to set up associated domains. For example, if your Team ID is A1B2C3D4E5 and Bundle Identifier is com.yourdomain.yourapp, provide A1B2C3D4E5.com.yourdomain.yourapp to Para. This is required by Apple for passkey security. Allow up to 24 hours for domain propagation. You can find this setting in the Developer Portal under the ‘Configuration’ tab of the API key label as Native Passkey Configuration.

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Configure Metro Bundler

Create or update metro.config.js in your project with the following node module resolutions. This will ensure that any library that depends on global modules like crypto or buffer will be properly resolved in the Expo environment.
metro.config.js
const { getDefaultConfig } = require("expo/metro-config");

const config = getDefaultConfig(__dirname);

config.resolver.extraNodeModules = {
  crypto: require.resolve("react-native-quick-crypto"),
  buffer: require.resolve("@craftzdog/react-native-buffer"),
};

module.exports = config;

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Import Required Shims

Import the Para Wallet shim in your root layout file to ensure proper global module shimming. This ensures that the necessary modules are available globally in your application. Ensure this is the very first import in your root layout file.
app/_layout.tsx
import "@getpara/react-native-wallet/shim";
// ... rest of your imports and layout code
Alternatively, you can create a custom entry point to handle the shimming. This will ensure that the shim occurs before the Expo Router entry point.

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Prebuild and Run

Since native modules are required, you’ll need to use Expo Development Build to ensure that linking is successful. This means using the expo prebuild command to generate the necessary native code and then run your app using expo run:ios or expo run:android. 
npx expo prebuild
npx expo run:ios
npx expo run:android
You cannot use Expo Go as it doesn’t support native module linking. When running via yarn start, switch to development mode by pressing s, then i for iOS or a for Android.

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Using the Para SDK

The @getpara/react-native-wallet@alpha provides two main authentication methods: email-based and phone-based. Both flows utilize Native Passkeys for secure and seamless authentication.
On mobile Para doesn’t provide a modal component. Instead you can create your own auth screens with either email, phone number, or oauth using the available methods in the Para SDK.

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Setup the Para Client

First, set up the Para client singleton and initialize it in your app:
para.ts
import { ParaMobile, Environment } from "@getpara/react-native-wallet";

export const para = new ParaMobile(Environment.BETA, YOUR_API_KEY);
Then initialize it in your app entry point:
app/_layout.tsx
import { para } from "../para";
import { useEffect } from "react";

export default function Layout() {
  useEffect(() => {
    const initPara = async () => {
      await para.init();
    };

    initPara();
  }, []);
  // ... rest of your layout code
}
Para offers two hosted environments: Environment.BETA (alias Environment.DEVELOPMENT) for testing, and Environment.PROD (alias Environment.PRODUCTION) for live use. Select the environment that matches your current development phase.
Beta Testing Credentials In the BETA Environment, you can use any email ending in @test.getpara.com (like dev@test.getpara.com) or US phone numbers (+1) in the format (area code)-555-xxxx (like (425)-555-1234). Any OTP code will work for verification with these test credentials. These credentials are for beta testing only. You can delete test users anytime in the beta developer console to free up user slots.

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Authentication Methods

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Sign Up or Log In with Email

Use the signUpOrLogIn method to handle both new user registration and existing user authentication:
const handleContinue = async (email: string) => {
  try {
    const authState = await para.signUpOrLogIn({ auth: { email } });
    
    if (authState?.stage === 'verify') {
      // New user - show OTP verification
      setShowOTP(true);
    } else if (authState?.stage === 'login') {
      // Existing user - proceed with passkey login
      await para.loginWithPasskey();
    }
  } catch (error) {
    // Handle error
  }
};

const handleVerification = async (verificationCode: string) => {
  try {
    const authState = await para.verifyNewAccount({ verificationCode });
    await para.registerPasskey(authState);
  } catch (error) {
    // Handle error
  }
};

// Usage example:
await handleContinue("user@example.com");
// If verification is needed:
await handleVerification("123456");

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Login Existing User with Email

For existing users, use the signUpOrLogIn method which will return a login stage, then use loginWithPasskey:
const handleLogin = async (email: string) => {
  try {
    const authState = await para.signUpOrLogIn({ auth: { email } });
    
    if (authState?.stage === 'login') {
      await para.loginWithPasskey();
    }
  } catch (error) {
    // Handle error
  }
};
By following these steps, you can implement a secure and user-friendly authentication system in your Expo application using the Para SDK.

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Examples

For practical implementations of the Para SDK in Expo environments, check out our GitHub repository:

Para Expo Integration Examples

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Troubleshooting

If you encounter issues during the integration or usage of the Para SDK in your Expo application, here are some common problems and their solutions:
For a more comprehensive list of solutions, including Expo-specific issues, visit our troubleshooting guide:

Troubleshooting

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Next Steps

After integrating Para, you can explore other features and integrations to enhance your Para experience.

EVM Integration

Solana Integration

Cosmos Integration