A sample configuration for a retail environment:

Version was released during a transition period for the QZ project. It followed the major architectural overhaul of version 1.9.0, which introduced TLS 1.2 support and improved certificate handling. Here is why 1.9.8 is specifically notable:

: Options to reduce or increase log detail to assist in troubleshooting. Google Groups Important Support Status The 1.9 branch reached End of Life (EOL)

<script src="https://cdn.jsdelivr.net/npm/qz-tray@1.9.8/qz-tray.js"></script> <script> // Connect to QZ Tray qz.websocket.connect().then(() => console.log("Connected to QZ Tray 1.9.8"); return qz.printers.find(); ).then(printers => console.log("Available printers:", printers); ).catch(err => console.error(err));

Previous 1.8.x versions suffered from sporadic connection drops over IPv6 networks. Version 1.9.8 introduced robust dual-stack (IPv4/IPv6) support and improved the WebSocket ping/pong keepalive mechanism, drastically reducing disconnections in high-volume printing environments.

Restaurants and retail stores run POS software in a browser (Chrome kiosk mode). When a sale is completed, JavaScript sends a raw ESC/POS string to QZ Tray 1.9.8, which prints the receipt and opens the cash drawer—all without popups or driver conflicts.