Mappings.json structure

Mappings.json contains mapping custom item to existing item in Minecraft.

Pro TIP: Learn to learn from examples!

This is example:

{
  "mappings": [
    {
      "key": "cc63f067",
      "material_value": "BEACON",
      "data_value": 1,
      "type": "BLOCK",
      "durability": 0
    },
    {
      "key": "7719b727",
      "material_value": "APPLE",
      "data_value": 2,
      "type": "ITEM",
      "durability": 0
    },
    {
      "key": "a872101b",
      "material_value": "PAPER",
      "data_value": 3,
      "type": "ITEM",
      "durability": 0
    },
    {
      "key": "c8ee439",
      "material_value": "EMERALD_BLOCK",
      "data_value": 0,
      "type": "BLOCK",
      "durability": 0
    },
    {
      "key": "126387c1",
      "material_value": "STATIONARY_WATER",
      "data_value": 3,
      "type": "BLOCK",
      "durability": 0
    }
  ]
}