Send whatsapp message to a number

index.js

const { Client, LocalAuth } = require('whatsapp-web.js');
const qrcode = require('qrcode-terminal');

// Initialize the WhatsApp client
const client = new Client({
    authStrategy: new LocalAuth()
});

// Generate and display the QR code in the terminal
client.on('qr', (qr) => {
    qrcode.generate(qr, { small: true });
});

// Log successful connection
client.on('ready', () => {
    console.log('WhatsApp client is ready!');
    
    // Replace with the target number and message
    const targetNumber = '919876543210'; // Example: '1234567890' without the '+' sign
    const message = 'Hello, this is a test message!';
    
    sendMessageToNumber(targetNumber, message);
});

// Function to send a message to a specific number
function sendMessageToNumber(number, message) {
    const chatId = `${number}@c.us`; // WhatsApp format for phone number
    
    client.sendMessage(chatId, message).then(response => {
        console.log('Message sent successfully:', response);
    }).catch(err => {
        console.error('Error sending message:', err);
    });
}

// Start the client
client.initialize();