MQTT Viewer features

Browse received topics with message counts, latest values and filters.

See topic traffic as a graph sized by message rate and coloured by recency.

Browse available topic history with payload previews and keyboard controls.

Plot numeric payloads and JSON fields over time, with optional pop-out charts.

Check available $SYS metrics, traffic rates and the busiest subscribed topics.

Inspect a topic in a panel docked right, along the bottom or in its own window.

Copy topic values, export history or clear known retained messages from the topic menu.

Read connection activity and errors, filtered by text or log level.

Compare a message with the previous one on the same topic.

Set a history memory budget per connection, with optional recording to disk.

Save reusable messages in folders shared across connections or kept for one broker.

Send messages with QoS and retain settings, then find them in publish history.

Read Sparkplug B metric names from births and check for sequence gaps or repeated births.

Decode Sparkplug B, Base64 and Hex payloads, format JSON and preview images.

Connect to up to 10 brokers using MQTT 3.1.1 or 5 over TCP, TLS or WebSocket.

Run MQTT Viewer in a browser with Docker or through Home Assistant ingress.

Install native builds for macOS, Windows or Linux, including ARM64.