JudoNet Monitor
JudoNet Monitor is the small desktop application behind the JudoNet icon. It does not show you any competition data — it exists to start and stop the JudoNet service and to handle the few things that cannot be done from a web page.
If you are wondering why there are two programs at all, see the two programs.
The buttons
| Button | What it does |
|---|---|
| START SERVICE / STOP SERVICE | Starts or stops the JudoNet service. The label changes to match the current state. |
| Open In Browser | Opens the JudoNet web page, already signed in. Only available while the service is running. |
| Open Log Folder | Opens C:\JudoNet\logs in Windows Explorer. |
| Save Previous Competition Data & Clear Database | Backs up the database and starts a fresh one. Only available while the service is stopped. |
| Copy Access Token to Clipboard | Copies the token that gives someone else full access from another PC. |
The line above the buttons always states the current state: JudoNet Service is currently RUNNING. or …STOPPED.
Starting the service
Press START SERVICE. After a few seconds the status line changes and Open In Browser becomes available.
On startup JudoNet also — provided it has administrator rights — adds its firewall rules, sets the PC's time server and forces a clock synchronisation. That is why the first start after installation takes a little longer.
JudoNet does not start with Windows. The service is installed to start on demand, so after any restart of the PC — including an unexpected one — somebody has to come back here and press START SERVICE.
Nothing else will tell you. The scoreboards carry on regardless, the competition carries on, and packets are simply not being collected until someone notices.
Stopping the service
Press STOP SERVICE. Because this is disruptive, JudoNet Monitor asks first:
You are about to stop the JudoNet.Service. Stopping this service will halt the saving and transmission of packets, potentially disrupting other systems that depend on its functionality.
Are you sure you want to proceed with stopping the service?
Anything that happens while the service is stopped is lost permanently. JudoNet cannot ask a scoreboard what it displayed while nobody was listening. Contests fought during a stop have no timings, are not archived, and cannot be cut from the recordings afterwards.
Stop the service only between sessions, or when you have been told to.
Closing the Monitor window while the service is running prompts you as well, offering to stop the service and close. Answer No if you only want the window out of the way — the service keeps running without it.
The blinking taskbar
If the service stops when you did not stop it — it crashed, or something else stopped it — JudoNet Monitor flashes its taskbar button continuously until the service is running again.
That flashing is the only warning you will get, which is a good reason to leave JudoNet Monitor open on the desktop during a competition rather than closing it.
The taskbar does not flash when you stopped the service yourself. Flashing always means something unexpected happened.
Backing up and clearing the database
JudoNet's database is meant to hold one competition at a time. Starting a new competition on top of an old one makes the Packets Explorer confusing and the database steadily slower.
Save Previous Competition Data & Clear Database does both halves of the job: it moves the current database into C:\JudoNet\data\backup\ under a dated name such as backup_db_20260808_091500.sqlite, and leaves JudoNet to create a fresh, empty one next time it starts.
The button is only available while the service is stopped — the database cannot be moved while JudoNet has it open.
Do this before a competition, never during one. Clearing the database mid-competition throws away every contest recorded so far, including the timings the Video CutterV2 needs.
The safe routine is: finish the competition → confirm everything has reached the platform → stop the service → back up and clear → start the service for the next competition.
Backing up and clearing also generates a new access token. Anyone who had been given the old one loses their access and will need the new one.
Access tokens
JudoNet controls critical functions, so not everyone who can reach the web page is allowed to change things.
- Opening the page with the Open In Browser button signs you in automatically. You get full access.
- Opening the page from any other PC — by typing the JudoNet PC's address into a browser — gives read-only access. You can see everything and change nothing.
Read-only is the safe default: anyone on the venue network can watch JudoNet without being able to switch off a master switch by accident.
Giving someone full access
- In JudoNet Monitor, press Copy Access Token to Clipboard.
- Send the token to the person you trust.
- They open the JudoNet page, click Access Token in the left-hand menu, paste it and confirm.
They then have the same full control as you.
The token is stored in C:\JudoNet\authtoken.json and is valid for five days. JudoNet Monitor issues a new one automatically once the old one is more than five days old, and also whenever you back up and clear the database.
If someone who used to have access suddenly finds the page read-only, the token has almost certainly rotated. Send them the current one.
The token is the only thing protecting JudoNet's controls. Give it to people who need to operate JudoNet, not to everyone who wants to look — read-only access is enough for watching, and it is what a spectator should have.
Log files
Open Log Folder opens C:\JudoNet\logs.
| File | Contents |
|---|---|
<date>.log | The main log — one file per day. |
archive\ | Older logs, rolled over automatically. |
UdpSenderService\udp-<date>.log | The UDP broadcasts to CG - JudoGraphics and FairReplay, kept separately because they are numerous. |
When reporting a problem, send the whole folder for the day rather than one file.
JudoNet Monitor keeps its own small log too. Both live under C:\JudoNet.