/mqtt — MQTT Topic Tree Visualizer
Paste a list of MQTT topics and see them as a collapsible tree, or connect straight to a broker over WebSocket and watch the topics fill in live. MQTT topics are slash-separated hierarchies (like
home/livingroom/temp); a tree makes the structure, shared branches and naming inconsistencies obvious. Single-level + and multi-level # wildcards are highlighted.Connect to a broker (live)
idle
Connects directly from your browser to the broker — nothing passes through 1234.nu, and nothing is stored. On an HTTPS page you must use a
Reliable public test broker:
wss:// URL (browsers block plain ws:// as mixed content); wss:// works from any page. Client ID is optional — leave it blank and a unique one is generated. Discovered topics are added to the list below.Reliable public test broker:
wss://broker.emqx.io:8084/mqtt (note the /mqtt path). Also: wss://test.mosquitto.org:8081, or ws://test.mosquitto.org:8080 — but mosquitto's plain-WS port is often down or firewalled, which shows as close code 1006.