WhatsApp Multiple Auth Gateway

Let's be real: running a separate Node.js process and copying authentication folders every time you want to spin up another WhatsApp bot is a special kind of pain—and the official WhatsApp Business API is just too expensive. Since I'm lazy like that (lol 😂) and didn't want to make my server cry from memory bloat, I built this WhatsApp Multiple Auth Gateway. It's a lightweight Express server using the Baileys library and a JavaScript Map to handle multiple active sessions in a single process, all managed via a real-time Socket.IO and Tailwind CSS dashboard. It exposes a simple POST /api/send endpoint for external scripts (like Laravel or cron jobs) to shoot messages from any account, and it even auto-loads existing sessions from disk on startup so I don't have to scan QR codes like a caveman every time I redeploy!

Tech Stack:

• Express & Node.js (for the lightweight REST API backend)
• @whiskeysockets/baileys (to interface with WhatsApp without official API fees)
• Socket.IO (for real-time status updates and dynamic QR streaming to the UI)
• Tailwind CSS (responsive light/dark dashboard layout)
• Pino & pino-pretty (for double-stream logs to console and files without clutter)
• Local Filesystem (using useMultiFileAuthState for hassle-free session persistence)