Jmqtt
Jmqtt: A focused open-source broker for teams that want self-hosted MQTT 3.1.1 with MySQL clustering. Ranked #38 of 46 in MQTT Broker Software by our editors (5.4/10); pricing: Free plan; best for self-hosted MQTT 3.1.1 with MySQL-based clustering.
At a glance
- Editor score5.4 / 10
- PricingFree plan
- Best forSelf-hosted MQTT 3.1.1 with MySQL-based clustering
- Free planYes
- Paid fromFree
- Deployment modelSelf-hosted
- Facts checked14 Nov 2026
Where it wins
- Supports TCP, WebSocket, SSL, and WSS connectivity
- Uses MySQL for data persistence and clustering
- Allows plugins and secondary development, including authentication extensions
Where it doesn't
- Protocol support is specified for MQTT 3.1.1
- MySQL underpins both persistence and clustering
- Its documented feature set is focused on broker connectivity and extension
Our verdict on Jmqtt
Jmqtt is an open-source MQTT broker implemented in Java and Netty, aimed at teams that want to run an MQTT 3.1.1 service on their own infrastructure. The project documents TCP and WebSocket connectivity, plus SSL and WSS, and supports MySQL-based data persistence and clustering. Its plugin and secondary-development support also makes it relevant to developers who want to extend broker behavior rather than adopt a hosted service. The published project is distributed under the Apache-2.0 license.
The clearest fit is a self-hosted deployment where MySQL is an acceptable foundation for both persistence and clustering. Jmqtt’s connection options cover TCP and browser-friendly WebSocket paths, with SSL and WSS also listed. The project describes plugin development for clustering, storage, device connections, and publish-subscribe authentication, so teams can work on those areas through extensions. Repository instructions cover building and running the broker, making this a developer-oriented choice rather than a managed service with a turnkey operating model.
The trade-off is a focused protocol scope: MQTT 3.1.1 is the documented version, and the listed capabilities center on connectivity, MySQL-backed storage and clustering, and plugins. Teams looking for a self-hosted broker with those characteristics may find the scope a match. Those needing a broader documented MQTT feature set or a different persistence and clustering foundation should compare alternatives before choosing Jmqtt. The project lists an online trial endpoint, but its core deployment model is self-hosted.
Your product? Our editors can test Jmqtt in depth and publish a review, labelled as paid · from $149/mo →
Jmqtt pricing
Jmqtt fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Deployment model | Self-hosted |
| MQTT versions | 3.1.1 |
| Retained messages | Not verified |
| Clustering | Yes |
| Connection limit | Not verified |
| Authentication methods | Not verified |
| Deployment | Self-hosted |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 14 Nov 2026 |
Alternatives to Jmqtt
- AWS IoT CoreA managed MQTT broker with device tools and message routing for AWS-centric IoT systems.9.4
- Azure Event Grid MQTT brokerA managed MQTT broker with Azure routing, flexible authentication, and usage-based pricing.9.2
- Apache BifroMQA self-hosted broker with clustering, distributed storage, and support for MQTT 3.1 through 5.0.9.1
Used Jmqtt? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Jmqtt for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Jmqtt is listed in our MQTT Broker Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/jmqtt/"><img src="https://www.itechguides.com/best/badge/jmqtt.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update