A mobile-first web app that scans book barcodes and instantly compares buyback prices from multiple German recommerce platforms.

Point your phone camera at a book's barcode, take a photo, and the app shows you how much each buyback service will pay — so you can spot profitable books at flea markets at a glance.

Supported platforms:

• Momox
• Rebuy
• Bonavendi (aggregates 20+ additional buyers)

The app is a single index.html frontend paired with a lightweight Node.js proxy server. The proxy is needed because the buyback APIs do not send CORS headers, so direct browser requests would be blocked.

Phone browser → Node.js proxy → Momox / Rebuy / Bonavendi APIs

Requirements: Node.js

git clone https://github.com/your-username/buyback-scout
cd buchscanner
node server.js

Open http://localhost:3000 in your browser.

Using on your phone (same Wi-Fi network):

The server prints your local IP on startup, e.g. http://192.168.1.25:3000.

Camera access requires a secure context. Either deploy with HTTPS (see below) or enable the Chrome flag on Android:

1. Open chrome://flags/#unsafely-treat-insecure-origin-as-secure
2. Add your local URL (e.g. http://192.168.1.25:3000)
3. Set to Enabled and relaunch Chrome

The included docker-compose.yml is set up for a Caddy reverse proxy using Docker labels. Caddy handles TLS automatically via Let's Encrypt — no certificate workarounds needed.

docker compose up -d --build

Adjust the domain in docker-compose.yml:

labels:
  caddy: buchscanner.yourdomain.com
  caddy.reverse_proxy: "{{upstreams 3000}}"

The Momox, Rebuy, and Bonavendi APIs used by this app are not officially documented or supported. They were reverse-engineered from public sources and may change or stop working at any time. This project is not affiliated with any of these services.