Express WhatsApp Session API

Node.js / Express backend that wraps the Baileys multi-file auth state to expose a minimal WhatsApp session API. Provides QR code delivery over WebSocket (as a Data URL), REST endpoints to send messages, check status, initiate/reinit connection, and perform secure logout with session cleanup. Implements auto-reconnect (unless explicitly logged out), open CORS for integration, and is deployable on Vercel as a single entrypoint.

Technologies Used

Key Features

• QR code delivery via WebSocket
• Send text message endpoint (/send-message)
• Session status endpoint (/status)
• Connection (re)initialization (/connect)
• Graceful logout & credential purge (/logout)
• Auto-reconnect unless manually logged out
• Multi-file auth state persistence
• Open CORS configuration
• Vercel serverless deployment ready
• Global unhandled rejection logging