WhatsApp library for NodeJS that connects through the browser app
...The object-oriented approach makes it easy to get running quickly. Since whatsapp-web.js works by running WhatsApp Web in the background and automating its interaction, you'll need to authorize the client by scanning a QRcode from WhatsApp on your phone. After scanning this QRcode, the client should be authorized and you should see a Client is ready! message being printed out.