Introduction to Baileys: WhatsApp Web API

Baileys is a powerful JavaScript library that allows developers to interact with WhatsApp Web APIs effortlessly. This tutorial provides an in-depth introduction to Baileys along with dozens of useful API explanations and sample codes to help you get started quickly.

Setup and Installation

  
    npm install @adiwajshing/baileys
  

Connecting to WhatsApp Web

  
    const { WAConnection } = require('@adiwajshing/baileys');

    async function connectToWhatsApp() {
      const conn = new WAConnection();
      conn.on('open', () => {
        console.log('Connected to WhatsApp Web');
      });
      await conn.connect();
    }

    connectToWhatsApp();
  

Sending a Text Message

  
    async function sendMessage(jid, message) {
      await conn.sendMessage(jid, message, MessageType.text);
    }

    sendMessage('123456789@s.whatsapp.net', 'Hello, this is a test message!');
  

Receiving Messages

  
    conn.on('chat-update', chatUpdate => {
      if (chatUpdate.messages && chatUpdate.count) {
        const message = chatUpdate.messages.all()[0];
        console.log('Received message: ', message);
      }
    });
  

Handling Media Files

  
    async function sendMedia(jid, filePath) {
      const buffer = fs.readFileSync(filePath);
      await conn.sendMessage(jid, buffer, MessageType.image);
    }

    sendMedia('123456789@s.whatsapp.net', 'path/to/image.jpg');
  

Creating a Simple WhatsApp Bot

Here’s a basic example of a WhatsApp bot using Baileys, integrating received messages and automatically responding:

  
    const { WAConnection, MessageType } = require('@adiwajshing/baileys');
    const fs = require('fs');

    const conn = new WAConnection();

    conn.on('open', () => {
      const authInfo = conn.base64EncodedAuthInfo();
      fs.writeFileSync('auth_info.json', JSON.stringify(authInfo));
    });

    conn.loadAuthInfo('auth_info.json');
    await conn.connect();

    conn.on('chat-update', async chatUpdate => {
      if (!chatUpdate.hasNewMessage) return;
      
      const message = chatUpdate.messages.all()[0];
      if (!message.message || message.key.fromMe) return;

      const content = message.message.conversation;
      console.log('Received message:', content);

      if (content.toLowerCase() === 'hello') {
        await conn.sendMessage(message.key.remoteJid, 'Hello! How can I assist you today?', MessageType.text);
      }
    });
  

And there you have it, a basic yet functional WhatsApp bot using Baileys. From sending text messages to handling media files, Baileys is an invaluable tool for any developer looking to build WhatsApp integrations efficiently. Happy coding!

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