MQTT Viewer features

Every topic on the broker in one tree, with counts, last values, filter and sort.

The topic namespace as a live graph. Size is message rate, colour is recency.

Every message on a topic as a timeline, with hover previews and keyboard stepping.

Plot numeric fields from JSON or bare numeric payloads over time, with pop-out windows.

$SYS metrics, health warnings, a traffic chart and the loudest topics, per broker.

Payload, timeline, diff and chart for the selected topic, docked right, bottom or in a window.

Copy, export and clear retained messages from a right-click menu, with retained topics marked in the tree.

A live, filterable log of the MQTT library's activity on each connection.

Diff a message against the previous one on the same topic.

History stays inside a memory budget you set, with optional recording to disk.

Global folders shown on every connection, connection folders scoped to one, and drag and drop between them.

Publish with QoS, retain and MQTT 5 properties, and resend from a searchable history.

Sparkplug B, Base64 and Hex decoding, JSON formatting and image previews.

Up to 10 connections over TCP, TLS, mutual TLS or WebSocket, MQTT 3.1.1 and MQTT 5.

The full app served over HTTP from a Docker image, plus a Home Assistant add-on.

macOS, Windows x64 and ARM64, and Linux as AppImage, deb, rpm, Flatpak or Nix.