Mosquitto vs Zwave-JS Server
A side-by-side comparison of two self-hosted home automation options — licensing, setup difficulty, resource needs, and what each one replaces.
Mosquitto
Lightweight MQTT message broker
VS
Zwave-JS Server
Small server wrapping the Z-Wave JS driver over WebSocket
| Feature | Mosquitto | Zwave-JS Server |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 92 · Excellent | 74 · Good |
| Category | Home Automation | Home Automation |
| License | EPL-2.0 | Apache-2.0 |
| Language | C | TypeScript |
| Setup difficulty | Easy | Medium |
| Min. RAM | 64 MB | 128 MB |
| Deployment | docker, bare-metal | docker, binary |
| GitHub stars | ★ 11,221 | ★ 164 |
| First released | 2009 | 2021 |
| Replaces | SmartThings | SmartThings |
What are Mosquitto and Zwave-JS Server?
Mosquitto
Eclipse Mosquitto is a lightweight, open-source MQTT broker widely used as the messaging backbone for smart home setups. It targets users connecting IoT devices and automation tools. It is deployed via Docker or packages.
- Standards-compliant MQTT broker
- Tiny resource footprint
- TLS and authentication
- Bridges between brokers
Zwave-JS Server
Z-Wave JS Server is a small server that exposes the Z-Wave JS driver over a WebSocket API. It allows multiple clients, such as Home Assistant, to control a Z-Wave network simultaneously.
- WebSocket Z-Wave API
- Multi-client support
- Built on Z-Wave JS
- Lightweight server
Mosquitto vs Zwave-JS Server: key differences
Mosquitto is written in C, while Zwave-JS Server is built with TypeScript. Licensing differs — EPL-2.0 for Mosquitto versus Apache-2.0 for Zwave-JS Server. Mosquitto is the lighter option, starting around 64 MB of RAM against 128 MB for Zwave-JS Server. Mosquitto is the more established project (first released 2009), while Zwave-JS Server arrived in 2021. Mosquitto has the considerably larger community, at 11,221 GitHub stars versus 164.
Why pick each one
Choose Mosquitto if…
- Extremely lightweight
- Rock-solid reliability
- Ubiquitous in smart homes
Watch out for
- Just a broker, not automation
- Minimal management UI
Choose Zwave-JS Server if…
- Decouples driver from clients
- Reliable
Watch out for
- Headless, no UI
- Z-Wave only
Frequently asked questions
Is Mosquitto or Zwave-JS Server better?
Mosquitto is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Zwave-JS Server if its specific feature set fits your needs better.
Are Mosquitto and Zwave-JS Server free and open-source?
Yes. Mosquitto is licensed under EPL-2.0 and Zwave-JS Server under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Mosquitto and Zwave-JS Server with Docker?
Mosquitto: yes. Zwave-JS Server: yes.
Which is lighter on resources, Mosquitto or Zwave-JS Server?
Mosquitto has the smaller minimum footprint at 64 MB of RAM, compared to about 128 MB for Zwave-JS Server. Real-world usage depends on library size, user count, and enabled features.