minecraft-packets/minecraft-packets/data/pc/1.18.2/from-server/initialize_world_border/3.json

An easy way to query PrismarineJS/minecraft-packets

{
  "x": 0,
  "z": 0,
  "oldDiameter": 59999968,
  "newDiameter": 59999968,
  "speed": 0,
  "portalTeleportBoundary": 29999984,
  "warningBlocks": 5,
  "warningTime": 15
}