How to Host WhatsApp Bots

npm init -y

npm install whatsapp-web.js qrcode

// Import necessary modules
const { Client } = require("whatsapp-web.js");
const qrcode = require("qrcode");

// Create a new WhatsApp client instance
const client = new Client({
  puppeteer: {
    // Run Chrome in headless mode (without graphical interface)
    headless: true,
    args: [
      // Disable Chrome sandboxing features
      // Required for execution in containerized environments
      "--no-sandbox",
      // Additional sandboxing flag to disable setuid sandbox
      "--disable-setuid-sandbox",
    ],
  },
  // Web version cache configuration
  webVersionCache: {
    // Type "remote" indicates WhatsApp Web version will be fetched from remote URL
    type: "remote",
    // Remote path for WhatsApp Web version
    remotePath: "INSERT_YOUR_URL_HERE",
  },
});

// Event listener for QR Code generation
client.on("qr", async (qr) => {
  // Use qrcode library to generate and save QR Code
  try {
    await qrcode.toFile("./qrcode.png", qr);
    console.log("QR Code generated and saved as qrcode.png");
  } catch (err) {
    console.error("Error generating QR Code:", err);
  }
});

// Event listener for client ready
client.on("ready", () => {
  // Confirmation log when WhatsApp Web session is established
  console.log("WhatsApp client successfully initialized!");
});

// Event listener for created messages
client.on("message_create", (msg) => {
  // Log message content to console
  console.log("Message received:", msg.body);
  
  // Test command implementation
  if (msg.body === "!ping") {
    // Automatic response for ping command
    msg.reply("pong - Bot working correctly!");
  }
});

// Initialize WhatsApp client
client.initialize();

npm install @whiskeysockets/baileys

const { makeWASocket, useMultiFileAuthState } = require("@whiskeysockets/baileys");
const qrcode = require("qrcode");

async function startBot() {
  // Load (or create) the authentication state from the "auth" folder.
  // Persist this folder (e.g. via Blob Storage) so the session survives redeploys.
  const { state, saveCreds } = await useMultiFileAuthState("auth");

  const sock = makeWASocket({
    auth: state,
  });

  // Persist updated credentials whenever Baileys rotates them
  sock.ev.on("creds.update", saveCreds);

  // Surface the QR code on first login and reconnect when the socket closes
  sock.ev.on("connection.update", async ({ connection, qr, lastDisconnect }) => {
    if (qr) {
      await qrcode.toFile("./qrcode.png", qr);
      console.log("QR Code generated and saved as qrcode.png - scan it with WhatsApp");
    }
    if (connection === "close") {
      const loggedOut = lastDisconnect?.error?.output?.statusCode === 401;
      if (!loggedOut) startBot();
    }
  });

  // Reply to a basic command
  sock.ev.on("messages.upsert", async ({ messages }) => {
    const msg = messages[0];
    if (!msg.message || msg.key.fromMe) return;

    if (msg.message.conversation === "!ping") {
      await sock.sendMessage(msg.key.remoteJid, { text: "pong - Bot working correctly!" });
    }
  });
}

startBot();

MAIN=index.js
MEMORY=512
VERSION=recommended