DEJA.JSMonitorDebug your layout, not your toolchain
See what your layout is doing, live. Command traces, device health, and event streams on every screen.
Transparency other systems hide
Command traces
Every DCC-EX command flows through Monitor in real time. Watch raw and parsed bytes between your server and the CommandStation.
Live telemetry
Track power draw, main and prog track status, and server uptime — all in one unified dashboard.
Mobile and desktop dashboards
Keep Monitor open on your phone while you drive. Full dashboard on the desktop for deeper diagnostics.
Event filtering
Cut through the noise. Filter the event stream by turnouts, locos, errors, or specific IO devices.
One view, every scale.
Every command. Every event. Every device.
When a train stops responding mid-session, Monitor lets you see exactly what the command station heard and what came back. No more guessing at wiring.
One account. Every app.
DEJA.js isn't a single tool — it's an open platform for driving, managing, and expanding your layout.
Free to try. No trial timer.
Spin up DEJA.js on your layout today — no credit card, no download for the web apps.
See what your layout is doing.
Monitor ships with every DEJA.js install. Open it on any device.