The /clisten command allows you to monitor and inspect network packets

Usage tree:

/clisten
├─ add
│  └─ <packet>
├─ remove
│  └─ <packet>
├─ list
└─ clear

• Adding Packets to Listen To: /clisten add <packet>
  • <packet> is the namespaced packet ID, for example /clisten add minecraft:use_item
• Removing Packets from Listening: /clisten remove <packet>
• Listing Monitored Packets: /clisten list
• Clearing All Monitored Packets: /clisten clear

You can view packets in either reflection mode (the default) or byte buf mode. To switch between them, use /cconfig clientcommands packetDumpMethod set <value>