MQTT.fx 1.2.0 is here!

It’s time for the next MQTT.fx release: MQTT.fx 1.2.0!
Most of the changes are under the hood, but in fact there also some new usability improvements.


As always you can download latest binaries/installers at

Please Report bugs and feature requests  via the issue tracker.

Release Notes

  • [New] Payload can now be decoded and exported in JSON format
  • [New] Topic of received messages can now be copied (and pasted)
  • [New] Eclipse Paho 1.1.0 included
  • [New] Bundled with JRE 1.8.0_102
  • [Fixed] Memory leak in terms of received and published messages
  • [Fixed] Issue when clearing the received messages buffer
  • [Fixed] Issue when last choosen import/export location is no longer valid

Display payload as JSON

Introcuding a new payload decoding option:

Publish unformatted JSON demo message:


Display plain JSON message:


Display formatted JSON message:


Speaking of decoding payload: next release is going to support custom payload decoder plugins!

Copy Topic

You now can copy (and paste) the topics of received messages: