How to Host a WhatsApp Bot 24/7

npm init -y

npm install whatsapp-web.js qrcode-terminal

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

// Create a new WhatsApp client instance
const client = new Client({
  // Save the session in the .wwebjs_auth folder, so restarts don't ask for a new QR Code
  authStrategy: new LocalAuth(),
  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",
    ],
  },
});

// Event listener for QR Code generation
client.on("qr", (qr) => {
  // Print the QR Code in the logs, so you can scan it from the Square Cloud dashboard
  qrcode.generate(qr, { small: true });
  console.log("Scan the QR Code above in WhatsApp: Linked devices > Link a device");
});

// 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();

DISPLAY_NAME=My WhatsApp Bot
MAIN=index.js
MEMORY=1024
VERSION=recommended
AUTORESTART=true

npm install @whiskeysockets/baileys qrcode-terminal

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

async function startBot() {
  // Load (or create) the authentication state from the "auth" folder.
  // Square Cloud keeps this folder between restarts, so the session survives.
  const { state, saveCreds } = await useMultiFileAuthState("auth");

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

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

  // Print the QR Code on first login and reconnect when the socket closes
  sock.ev.on("connection.update", ({ connection, qr, lastDisconnect }) => {
    if (qr) {
      // Print the QR Code in the logs, so you can scan it from the Square Cloud dashboard
      qrcode.generate(qr, { small: true });
      console.log("Scan the QR Code above in WhatsApp: Linked devices > Link a device");
    }
    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();

DISPLAY_NAME=My WhatsApp Bot
MAIN=index.js
MEMORY=512
VERSION=recommended
AUTORESTART=true