minecraft-packets/minecraft-packets/data/pc/1.12.2/from-server/login/1.json

An easy way to query PrismarineJS/minecraft-packets

{
  "entityId": 837,
  "gameMode": 0,
  "dimension": 0,
  "difficulty": 1,
  "maxPlayers": 20,
  "levelType": "default",
  "reducedDebugInfo": false
}