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

{
  "type": "crafting_shaped",
  "pattern": [
    "X#X",
    "#X#",
    "X#X"
  ],
  "key": {
    "#": [
      {
        "item": "minecraft:sand"
      },
      {
        "item": "minecraft:red_sand"
      }
    ],
    "X": {
      "item": "minecraft:gunpowder"
    }
  },
  "result": {
    "item": "minecraft:tnt"
  }
}