minecraft-assets/data/minecraft/recipes/beacon.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "GGG",
    "GSG",
    "OOO"
  ],
  "key": {
    "S": {
      "item": "minecraft:nether_star"
    },
    "G": {
      "item": "minecraft:glass"
    },
    "O": {
      "item": "minecraft:obsidian"
    }
  },
  "result": {
    "item": "minecraft:beacon"
  }
}