WhatsApp API Sender

I needed a way to send automated WhatsApp messages for various projects notifications, alerts, reminders, that sort of thing. The official WhatsApp Business API felt like overkill (and honestly, too expensive 😂) for what I wanted to do. So I built this: a lightweight REST API that lets you send WhatsApp messages with just a simple HTTP request.

Built with Node.js, Express, and the Baileys library, this tool turns any WhatsApp account into a programmable messaging endpoint. You scan a QR code once to link your device, and then you're good to go, just send a POST request with the phone number and message, and it handles the rest.

I added Basic Authentication to keep things secure (because you definitely don't want random people sending messages from your number), and a secret scan URL so only authorized users can link their WhatsApp accounts. There's also real-time connection status monitoring using Socket.IO, so you can see if your bot is online or if it needs to reconnect.