This repository demonstrate a simple webhook sender and receiver implementation using Node.js, Express, and TypeScript.

• Receiver – An Express server that listens for incoming webhook POST requests at /webhook, verifies the HMAC-SHA256 signature, and processes events.
• Sender – A script that sends sample webhook events (user.created, order.paid, etc.) to the receiver with a signed payload.

# Install dependencies
npm install

# Build TypeScript
npm run build

# Start the receiver
npm start

# In another terminal, run the sender demo
npm run sender

# Run receiver with ts-node (no build step)
npm run receiver

# Run tests
npm test

src/
  app.ts        – Express app and webhook route
  receiver.ts   – Server entry point
  sender.ts     – Webhook sender demo
tests/
  receiver.test.ts – Integration tests for the receiver

Webhook payloads are signed using HMAC-SHA256. The receiver verifies the signature before processing any event. Always use a strong, secret key stored in environment variables (not hardcoded) in production.