MetaMask SDK React Native

The MetaMask SDK React Native allows developers to integrate MetaMask seamlessly into React Native applications.

Getting Started

Installation

Install the SDK:

yarn add @metamask/sdk-react-native

iOS Setup

1. Add the following imports to your AppDelegate.m:

#import <React/RCTBundleURLProvider.h>
#import <React/RCTBridge.h>
#import <React/RCTLinkingManager.h>

2. Implement the following method in AppDelegate.m to handle deep links:

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options
{
  return [RCTLinkingManager application:app openURL:url options:options];
}

3. Add the URL scheme to your Xcode project:

   • Open your project in Xcode.
   • Go to the Info tab.
   • Under URL Types, click the + button to add a new URL type.
   • In the URL Schemes field, add your custom scheme (e.g., yourappscheme).

4. Install CocoaPods dependencies:

cd ios && pod install

Wrap Your Application in the Provider

import React from 'react';
import { AppRegistry } from 'react-native';
import App from './App';
import { MetaMaskProvider } from '@metamask/sdk-react-native';

const sdkOptions = {
  dappMetadata: {
    name: 'Demo React Native App',
    url: 'https://yourdapp.com',
    iconUrl: 'https://yourdapp.com/icon.png',
    scheme: 'yourappscheme',
  },
  infuraAPIKey: 'YOUR_INFURA_API_KEY', // Optional, but highly recommended for a better user experience
};

const Root = () => (
  <MetaMaskProvider sdkOptions={sdkOptions}>
    <App />
  </MetaMaskProvider>
);

AppRegistry.registerComponent('YourAppName', () => Root);

Use the SDK in Your Components

import { useSDK } from '@metamask/sdk-react-native';
import React from 'react';
import { View, Button, Text } from 'react-native';

const App = () => {
  const { sdk, connected, connecting, provider, chainId, account } = useSDK();

  const connect = async () => {
    try {
      await sdk?.connect();
    } catch (err) {
      console.warn('Failed to connect..', err);
    }
  };

  return (
    <View style={{ padding: 20 }}>
      <Button title="Connect" onPress={connect} disabled={connecting} />
      {connected && (
        <View>
          {chainId && <Text>Connected chain: {chainId}</Text>}
          {account && <Text>Connected account: {account}</Text>}
        </View>
      )}
    </View>
  );
};

export default App;

SDK Options

Option	Type	Description	Mandatory
dappMetadata.name	string	Name of your dApp	Yes
dappMetadata.url	string	URL of your dApp	Yes
dappMetadata.iconUrl	string	URL of the icon of your dApp	No
dappMetadata.scheme	string	Custom scheme for your React Native app	Yes
infuraAPIKey	string	Your Infura API key	No

SDK Methods

• connect(): Connect to MetaMask.
• connectAndSign({ msg }): Connect to MetaMask and sign a message.
• connectWith(req): Connect to MetaMask with a specific request.
• terminate(): Terminate the MetaMask connection.

Provider Methods

• request(req): Make a request to MetaMask.
• batchRequest(requests): Make batch requests to MetaMask.
• getChainId(): Get the current chain ID.
• getSelectedAddress(): Get the selected address.

Example

Refer to the example folder for more info on how to use the SDK.

Contacts

For additional support, open an issue on our GitHub repository.