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wechat NPM version Build Status Dependencies Status Coverage Status
Wechat is a middleware and SDK of Wechat Official Account Admin Platform (mp.weixin.qq.com).
This wechat document is translated by Guo Yu, if you have some understanding problems, please feel free open an issue here.

Features

  • Auto reply (text, image, videos, music, thumbnails posts are supported)
  • CRM message (text, image, videos, music, thumbnails posts are supported)
  • Menu settings (CRD are supported)
  • QR codes (CR are supported, both temporary and permanent)
  • Group settings (CRUD are supported)
  • Followers infomation (fetching user's info or followers list)
  • Media (upload or download)
  • Reply Waiter (good for surveys)
  • Sessions
  • OAuth API
  • Payment (deliver notify and order query)

API details located here

Installation

npm install wechat

Use with Connect/Express

var wechat = require('wechat');

app.use(connect.query()); // Or app.use(express.query());
app.use('/wechat', wechat('some token', function (req, res, next) {
  // message is located in req.weixin
  var message = req.weixin;
  if (message.FromUserName === 'diaosi') {
    // reply with text
    res.reply('hehe');
  } else if (message.FromUserName === 'text') {
    // another way to reply with text
    res.reply({
      content: 'text object',
      type: 'text'
    });
  } else if (message.FromUserName === 'hehe') {
    // reply with music
    res.reply({
      type: "music",
      content: {
        title: "Just some music",
        description: "I have nothing to lose",
        musicUrl: "http://mp3.com/xx.mp3",
        hqMusicUrl: "http://mp3.com/xx.mp3"
      }
    });
  } else {
    // reply with thumbnails posts
    res.reply([
      {
        title: 'Come to fetch me',
        description: 'or you want to play in another way ?',
        picurl: 'http://nodeapi.cloudfoundry.com/qrcode.jpg',
        url: 'http://nodeapi.cloudfoundry.com/'
      }
    ]);
  }
}));

Tips: you'll have to apply token at Wechat platform (this page is in Chinese)

Reply Messages

auto reply a message when your followers send a message to you. also text, image, videos, music, thumbnails posts are supported. details API goes here (official documents)

Reply with text

res.reply('Hello world!');
// or
res.reply({type: "text", content: 'Hello world!'});

Reply with Image

res.reply({
  type: "image",
  content: {
    mediaId: 'mediaId'
  }
});

Reply with voice

res.reply({
  type: "voice",
  content: {
    mediaId: 'mediaId'
  }
});

Reply with Video

res.reply({
  type: "video",
  content: {
    mediaId: 'mediaId',
    thumbMediaId: 'thumbMediaId'
  }
});

Reply with Music

res.reply({
  title: "Just some music",
  description: "I have nothing to lose",
  musicUrl: "http://mp3.com/xx.mp3",
  hqMusicUrl: "http://mp3.com/xx.mp3"
});

Reply with Thumbnails posts

res.reply([
  {
    title: 'Come to fetch me',
    description: 'or you want to play in another way ?',
    picurl: 'http://nodeapi.cloudfoundry.com/qrcode.jpg',
    url: 'http://nodeapi.cloudfoundry.com/'
  }
]);

Reply with social function messages

res.reply({
    type: 'hardware',
    HardWare:{
      MessageView: 'myrank',
      MessageAction: 'ranklist'
    }
});

transfer user message to wechat customer service

transfer the message sent from wechat users to the Wechat Multi Customer Service 
res.transfer2CustomerService();

Reply with device messages

Specific responses will be made as the message type is devicetext or deviceevent. 
var wechat = require('wechat');
var config = {
  token: 'token',
  appid: 'appid',
  encodingAESKey: 'encodinAESKey',
  checkSignature: true // optional, default value is true. Because WeChat open platform debug tool does not send signature in plaintext mode, if you want to use this debug tool, please set to false
};

app.use(express.query());
app.use('/wechat', wechat(config, function (req, res, next) {
  // message is located in req.weixin
  var message = req.weixin;
  if (message.MsgType === 'device_text') {
    // device text
    res.reply('This message will be pushed onto the device.');
  } else if (message.MsgType === 'device_event') {
    if (message.Event === 'subscribe_status' ||
      message.Event === 'unsubscribe_status') {
    //subscribe or unsubscribe the WIFI device status,the reply should be 1 or 0
      res.reply(1);
    } else {
      res.reply('This message will be pushed onto the device.')
    }
  }
}));

WXSession

Wechat messages are not communicate like traditional C/S model, therefore nothing Cookies will be store in Wechat client. this WXSession is designed to support access user's infomation via req.wxsession, with connect.session backed.
It's a simple demo:
app.use(connect.cookieParser());
app.use(connect.session({secret: 'keyboard cat', cookie: {maxAge: 60000}}));
app.use('/wechat', wechat('some token', wechat.text(function (info, req, res, next) {
  if (info.Content === '=') {
    var exp = req.wxsession.text.join('');
    req.wxsession.text = '';
    res.reply(exp);
  } else {
    req.wxsession.text = req.wxsession.text || [];
    req.wxsession.text.push(info.Content);
    res.reply('Message got ' + info.Content);
  }
})));

req.wxsession and req.session shares same store. width redis as persistence database, across processes sharing are supportd.

Reply Waiter

a reply waiter is seems like a telephone menu system. it must be setup before activation. this function is supported upon WXSession.
var List = require('wechat').List;
List.add('view', [
  ['reply {a}', function (info, req, res) {
    res.reply('Im Answer A');
  }],
  ['reply {b}', function (info, req, res) {
    res.reply('Im Answer B');
  }],
  ['reply {c}', 'Im Answer C (the shorthand method)']
]);

active the reply waiter we setuped before:
var app = connect();
app.use(connect.query());
app.use(connect.cookieParser());
app.use(connect.session({secret: 'keyboard cat', cookie: {maxAge: 60000}}));
app.use('/wechat', wechat('some token', wechat.text(function (info, req, res, next) {
  if (info.Content === 'list') {
    res.wait('view'); // view is the very waiter we setuped before.
  } else {
    res.reply('hehe');
    // or stop the waiter and quit.
    // res.nowait('hehe');
  }
})));

if waiter view actived, user will receive messages below:
reply a
reply b
reply c

reply waiter acquires both function and text as a callback action
List.add('view', [
  ['reply {a}', function (info, req, res, next) {
    // we callback as a function
    res.reply('Answer A');
  }],
  // or text as shorthand
  ['reply {c}', 'Answer C']
]);

if user's message is not in waiter's trigger texts. this message will be processd in the else way and can be stoped by res.nowait(), res.nowait method actions like reply method.

Show cases

Auto-reply robot based on Node.js

Node.js API Auto-reply robot
Codes here
robots can be setup in PAASs like CloudFoundry, appfog or BAE.

API details

official document locates here Messages API Guide (in Chinese)。
wachat 0.6.x supports shorthand methods below:
app.use('/wechat', wechat('some token', wechat.text(function (message, req, res, next) {
  // reply with text
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125035',
  // MsgType: 'text',
  // Content: 'http',
  // MsgId: '5837397576500011341' }
}).image(function (message, req, res, next) {
  // message为图片内容
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359124971',
  // MsgType: 'image',
  // PicUrl: 'http://mmsns.qpic.cn/mmsns/bfc815ygvIWcaaZlEXJV7NzhmA3Y2fc4eBOxLjpPI60Q1Q6ibYicwg/0',
  // MediaId: 'media_id',
  // MsgId: '5837397301622104395' }
}).voice(function (message, req, res, next) {
  // Reply with Voice
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125022',
  // MsgType: 'voice',
  // MediaId: 'OMYnpghh8fRfzHL8obuboDN9rmLig4s0xdpoNT6a5BoFZWufbE6srbCKc_bxduzS',
  // Format: 'amr',
  // MsgId: '5837397520665436492' }
}).video(function (message, req, res, next) {
  // Reply with Video
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125022',
  // MsgType: 'video',
  // MediaId: 'OMYnpghh8fRfzHL8obuboDN9rmLig4s0xdpoNT6a5BoFZWufbE6srbCKc_bxduzS',
  // ThumbMediaId: 'media_id',
  // MsgId: '5837397520665436492' }
}).location(function (message, req, res, next) {
  // Reply with Location (geo)
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125311',
  // MsgType: 'location',
  // Location_X: '30.283950',
  // Location_Y: '120.063139',
  // Scale: '15',
  // Label: {},
  // MsgId: '5837398761910985062' }
}).link(function (message, req, res, next) {
  // Reply with Link
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125022',
  // MsgType: 'link',
  // Title: 'A link',
  // Description: 'A link has its desc',
  // Url: 'http://1024.com/',
  // MsgId: '5837397520665436492' }
}).event(function (message, req, res, next) {
  // Reply with Event
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125022',
  // MsgType: 'event',
  // Event: 'LOCATION',
  // Latitude: '23.137466',
  // Longitude: '113.352425',
  // Precision: '119.385040',
  // MsgId: '5837397520665436492' }
}).device_text(function (message, req, res, next) {
  // Reply with device text.
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125022',
  // MsgType: 'device_text',
  // DeviceType: 'gh_d3e07d51b513'
  // DeviceID: 'dev1234abcd',
  // Content: 'd2hvc3lvdXJkYWRkeQ==',
  // SessionID: '9394',
  // MsgId: '5837397520665436492',
  // OpenID: 'oPKu7jgOibOA-De4u8J2RuNKpZRw' }
}).device_event(function (message, req, res, next) {
  // Reply with device event.
  // { ToUserName: 'gh_d3e07d51b513',
  // FromUserName: 'oPKu7jgOibOA-De4u8J2RuNKpZRw',
  // CreateTime: '1359125022',
  // MsgType: 'device_event',
  // Event: 'bind'
  // DeviceType: 'gh_d3e07d51b513'
  // DeviceID: 'dev1234abcd',
  // OpType : 0, //Available as Event is subscribe_status or unsubscribe_status.
  // Content: 'd2hvc3lvdXJkYWRkeQ==', //Available as Event is not subscribe_status and unsubscribe_status.
  // SessionID: '9394',
  // MsgId: '5837397520665436492',
  // OpenID: 'oPKu7jgOibOA-De4u8J2RuNKpZRw' }
})));

Tips: text, image, voice, video, location, link, event, device_text, device_event must be set at least one.

More simple APIs

Supported in 0.3.x and above.
app.use('/wechat', wechat('some token').text(function (message, req, res, next) {
  // TODO
}).image(function (message, req, res, next) {
  // TODO
}).voice(function (message, req, res, next) {
  // TODO
}).video(function (message, req, res, next) {
  // TODO
}).location(function (message, req, res, next) {
  // TODO
}).link(function (message, req, res, next) {
  // TODO
}).event(function (message, req, res, next) {
  // TODO
}).device_text(function (message, req, res, next) {
  // TODO
}).device_event(function (message, req, res, next) {
  // TODO
}).middlewarify());

Functions Graph

graph
Tips: Business logic in blue lines.

License

The MIT license.

Donation

buy me a cup of coffee please.
donate wechat
Or: