WhatsApp Bot with Baileys

A simple WhatsApp bot that maintains session persistence so you don't lose connection.

Features

• ✅ Session Persistence: Saves authentication data to disk, so you won't lose connection on restart
• ✅ Auto Reconnect: Automatically reconnects if connection is lost (unless logged out)
• ✅ QR Code Login: Scan QR code with WhatsApp to connect
• ✅ Simple Commands:
  • Send "ping" → Bot responds with "🏓 Pong!"
  • Send "hello" → Bot sends a greeting message

Installation

All dependencies are already installed. If you need to reinstall:

npm install

Usage

Start the Bot

npm start

Or directly:

node bot.js

First Time Setup

1. Run the bot with npm start
2. A QR code will appear in the terminal
3. Open WhatsApp on your phone
4. Go to Settings → Linked Devices → Link a Device
5. Scan the QR code
6. Once connected, you'll see "✅ Connected successfully!"

Session Management

• Session data is stored in the session/ folder
• The bot will automatically use saved session on restart
• To logout completely, delete the session/ folder and restart

How It Works

1. Authentication: Uses useMultiFileAuthState to save credentials to disk
2. Session Persistence: Credentials are saved every time they update
3. Auto Reconnect: Detects disconnections and reconnects automatically (except when logged out)
4. Message Handling: Listens for incoming messages and responds based on content

Customization

Edit the bot.js file to add your own commands:

// Add your custom logic in the messages.upsert event
if (messageType.toLowerCase() === 'your-command') {
    await sock.sendMessage(senderId, { text: 'Your response' });
}

Troubleshooting

• QR code not appearing: Make sure terminal supports it
• Connection lost: Check your internet connection
• Logged out: Delete the session/ folder and scan QR again
• Messages not sending: Ensure you're connected and the recipient hasn't blocked you

Dependencies

• @whiskeysockets/baileys - WhatsApp Web API
• qrcode-terminal - Display QR codes in terminal
• pino - Logging utility