capacitor-wechat

WeChat SDK for Capacitor - enables authentication, sharing, payments, and mini-programs.

Documentation

The most complete doc is available here: https://capgo.app/docs/plugins/wechat/

Compatibility

Note: The major version of this plugin follows the major version of Capacitor. Use the version that matches your Capacitor installation (e.g., plugin v8 for Capacitor 8). Only the latest major version is actively maintained.

Install

npm install @capgo/capacitor-wechat
npx cap sync

Configuration

Capacitor config

Add your WeChat credentials to capacitor.config.ts (or .json). You can override them at runtime by calling CapacitorWechat.initialize(...).

const config: CapacitorConfig = {
  appId: 'com.example.app',
  appName: 'Example',
  webDir: 'dist',
  plugins: {
    CapacitorWechat: {
      appId: 'wx1234567890abcdef',
      universalLink: 'https://your-universal-link.example.com/'
    }
  }
};

iOS

Add the following to your Info.plist:

<key>LSApplicationQueriesSchemes</key>
<array>
  <string>weixin</string>
  <string>weixinULAPI</string>
</array>

<key>CFBundleURLTypes</key>
<array>
  <dict>
    <key>CFBundleTypeRole</key>
    <string>Editor</string>
    <key>CFBundleURLName</key>
    <string>weixin</string>
    <key>CFBundleURLSchemes</key>
    <array>
      <string>YOUR_WECHAT_APP_ID</string>
    </array>
  </dict>
</array>

You'll need to integrate the WeChat SDK into your iOS project. Add the WeChat SDK to your Podfile or download it from the WeChat Open Platform.

Important: iOS requires a valid Universal Link to be configured. You must set the universalLink parameter either in your capacitor.config (as shown above) or when calling initialize(). Without a valid Universal Link, the app will crash during WeChat SDK initialization. Learn more about configuring Universal Links in the WeChat iOS documentation.

Android

Add the following to your AndroidManifest.xml:

<manifest>
  <application>
    <!-- WeChat callback activity -->
    <activity
      android:name=".wxapi.WXEntryActivity"
      android:exported="true"
      android:label="@string/app_name"
      android:launchMode="singleTask"
      android:theme="@android:style/Theme.Translucent.NoTitleBar">
      <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
      </intent-filter>
    </activity>
  </application>
</manifest>

You'll need to integrate the WeChat SDK into your Android project. Add the WeChat SDK dependency to your build.gradle or download it from the WeChat Open Platform.

Create WXEntryActivity and WXPayEntryActivity inside your application's package (your.package.name.wxapi). Both activities should extend ee.forgr.plugin.capacitor_wechat.WechatResponseActivity so the plugin can receive callbacks from WeChat:

package your.package.name.wxapi;

import ee.forgr.plugin.capacitor_wechat.WechatResponseActivity;

public class WXEntryActivity extends WechatResponseActivity {}

public class WXPayEntryActivity extends WechatResponseActivity {}

Register these activities in your app manifest just like the snippet above (WeChat requires both for general SDK + Pay callbacks).

Setup

Before using any WeChat functionality, you need to register your app with a WeChat App ID from the WeChat Open Platform. Once you have the credentials, either place them in capacitor.config or call CapacitorWechat.initialize before making other calls:

import { CapacitorWechat } from '@capgo/capacitor-wechat';

await CapacitorWechat.initialize({
  appId: 'wx1234567890abcdef',
  universalLink: 'https://your-universal-link.example.com/'
});

API

initialize(options: WechatInitializationOptions) => Promise<void>

isInstalled() => Promise<{ installed: boolean; }>

auth(options: WechatAuthOptions) => Promise<WechatAuthResponse>

share(options: WechatShareOptions) => Promise<void>

sendPaymentRequest(options: WechatPaymentOptions) => Promise<void>

openMiniProgram(options: WechatMiniProgramOptions) => Promise<{ extMsg?: string; }>

chooseInvoice(options: WechatInvoiceOptions) => Promise<WechatInvoiceResponse>

getPluginVersion() => Promise<{ version: string; }>

Usage Examples

Check Installation

import { CapacitorWechat } from '@capgo/capacitor-wechat';

const checkWechat = async () => {
  const { installed } = await CapacitorWechat.isInstalled();
  console.log('WeChat installed:', installed);
};

Authentication

const loginWithWechat = async () => {
  try {
    const { code } = await CapacitorWechat.auth({
      scope: 'snsapi_userinfo',
      state: 'my_random_state'
    });

    // Send code to your backend to exchange for access token
    const response = await fetch('https://yourapi.com/auth/wechat', {
      method: 'POST',
      body: JSON.stringify({ code })
    });

    const { access_token } = await response.json();
    console.log('Access token:', access_token);
  } catch (error) {
    console.error('WeChat auth failed:', error);
  }
};

Share Content

// Share text
const shareText = async () => {
  await CapacitorWechat.share({
    scene: 0, // 0 = Chat, 1 = Moments, 2 = Favorite
    type: 'text',
    text: 'Hello from Capacitor WeChat!'
  });
};

// Share link
const shareLink = async () => {
  await CapacitorWechat.share({
    scene: 1,
    type: 'link',
    title: 'Check out this awesome app!',
    description: 'Built with Capacitor',
    link: 'https://capacitorjs.com',
    thumbUrl: 'https://capacitorjs.com/icon.png'
  });
};

Payment

const payWithWechat = async () => {
  // First, get payment parameters from your server
  const paymentParams = await fetchPaymentParamsFromServer();

  try {
    await CapacitorWechat.sendPaymentRequest({
      partnerId: paymentParams.partnerId,
      prepayId: paymentParams.prepayId,
      nonceStr: paymentParams.nonceStr,
      timeStamp: paymentParams.timeStamp,
      package: paymentParams.package,
      sign: paymentParams.sign
    });

    console.log('Payment successful!');
  } catch (error) {
    console.error('Payment failed:', error);
  }
};

Open Mini Program

const openMiniProgram = async () => {
  const { extMsg } = await CapacitorWechat.openMiniProgram({
    username: 'gh_xxxxxxxxxxxxx', // Mini program original ID
    path: 'pages/index/index',
    type: 0 // 0 = Release, 1 = Test, 2 = Preview
  });

  console.log('Mini program returned:', extMsg);
};

Important Notes

1. WeChat SDK: The plugin pulls the official SDKs via CocoaPods (WechatOpenSDK) and Gradle (com.tencent.mm.opensdk:wechat-sdk-android-without-mta). If you use a custom build setup, ensure those dependencies stay intact.

2. App Registration: You must register your app on the WeChat Open Platform to get an App ID.

3. Universal Links (iOS): For iOS 13+, you need to configure Universal Links for WeChat callbacks.

4. Backend Integration: Authentication and payment features require backend integration to exchange codes for tokens and prepare payment parameters.

Troubleshooting

iOS: App crashes with NSException on startup

Problem: App crashes immediately when WeChat plugin loads with an NSException error.

Solution: This usually happens when the universalLink is not configured or is empty. Ensure you have set the universalLink in your capacitor.config or when calling initialize():

// In capacitor.config.ts
plugins: {
  CapacitorWechat: {
    appId: 'wx1234567890abcdef',
    universalLink: 'https://your-domain.com/universal-link/'  // Required for iOS!
  }
}

// Or in your app initialization
await CapacitorWechat.initialize({
  appId: 'wx1234567890abcdef',
  universalLink: 'https://your-domain.com/universal-link/'
});

Learn how to set up Universal Links for WeChat in the WeChat iOS documentation.

iOS: Build errors with WechatOpenSDK

Problem: Build fails with errors about missing WechatOpenSDK module.

Solution: Make sure the WeChat SDK is properly installed via CocoaPods. Run:

cd ios/App
pod install

Credits

This plugin was inspired by cordova-plugin-wechat and adapted for Capacitor.

License

MIT

Contributing

See CONTRIBUTING.md for details on how to contribute to this plugin.