labeljetty 0.4.1

Network-accessible printing for USB TSPL thermal label printers (library + REST API + web UI).

🏷️ LabelJetty

Turn a cheap, USB-only TSPL thermal label printer into a smart, network-accessible label printer - drive it from your phone, desktop, or another machine over your LAN. It talks to the printer directly over USB (no CUPS, no vendor driver) and gives you a mobile-first web UI, a REST API, and a Python library for printing PNGs, PDFs, text, markdown, barcodes and QR codes. Optional, self-contained Homebox integration is built in.

Install

pip install labeljetty
# or, with uv:
uv tool install labeljetty

This gives you three commands:

• labeljetty - runs the service (REST API + web UI + background print worker)
• labeljetty-testbench - drives the printer library directly (real device or dry-run)
• labeljetty-hash-password - generates a password hash for a login user

You need Python 3.11+, libusb, and a USB TSPL printer. PRINTER_USB auto-detects a single connected printer; pin one (e.g. PRINTER_USB=vid:2d37:pid:62de, found via lsusb) in a .env or the environment if you have several. Then run labeljetty and open http://localhost:8888/. The Setup guide is the overview; finding the printer and the udev rule are covered under Advanced usage.

Prefer Docker? The image is motey/labeljetty.

Heads-up

• No authentication by default - fine on a trusted home LAN, but turn on AUTH_MODE=protected before exposing it to an untrusted network.
• Reference hardware is a Vretti 420B (Poskey-class TSPL, ~203 dpi). It should work with any USB TSPL printer; feedback/PRs for other models are welcome.

More information

Full docs, the configuration reference, authentication, the REST API, printer/udev setup, and Homebox integration live on GitHub: https://github.com/motey/LabelJetty