Debugging
Inspector¶
You can use the the built-in inspector from Node.js to debug your application.
Tip
Read more about Debugging Node.js Applications.
Using the inspector on production environment¶
Be careful when using the inspector on production. Using memory snapshots and breakpoints will impact the experience of your users directly.
1. Connect to the remote server:
ssh root@remote.example.com
2. Check the PID of the Node process
ps aux | grep node
3. Attach the inspector on the process
kill -usr1 PID
4. Create a SSH tunnel from your local machine to the remote inspector
ssh -L 9229:localhost:9229 root@remote.example.com
Your production server should now appear on chrome://inspect.
Debug messages¶
To enable all debug logs, run your server using the DEBUG=colyseus:* environment variable:
DEBUG=colyseus:* npm start
Alternatively, you can only enable to printing debug logs per category.
colyseus:patch¶
Logs the number of bytes and interval between patches broadcasted to all clients.
colyseus:patch "chat" (roomId: "ryWiL5rLTZ") is sending 28 bytes: +57ms
colyseus:errors¶
Logs whenever unexpected (or expected, internally) errors happens on the server-side.
colyseus:matchmaking¶
Logs whenever a room is spawned or disposed.
colyseus:matchmaking spawning 'chat' on worker 77218 +52s
colyseus:matchmaking disposing 'chat' on worker 77218 +2s