Make sure you added an item before reading this tutorial, we will be using it.

So far, our item is obtainable through the creative menu or commands. To make it available to survival players, we'll add a crafting recipe for the item.

Create a file named fabric_item.json under resources/data/tutorial/recipes/ (replace tutorial with your mod id if appropriate). Here's an example recipe for the fabric_item we made:

resources/data/tutorial/recipes/fabric_item.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "WWW",
    "WR ",
    "WWW"
  ],
  "key": {
    "W": {
      "tag": "minecraft:logs"
    },
    "R": {
      "item": "minecraft:redstone"
    }
  },
  "result": {
    "item": "tutorial:fabric_item",
    "count": 4
  }
}

Breakdown of the recipe:

• type: This is a shaped crafting recipe.
• result: This is a crafting recipe for 4 tutorial:fabric_item.
• pattern: A pattern that represents the crafting recipe. Each letter represents one item. An empty space means that no item is required in that slot. What each letter represents is defined in key.
• key: What each letter in the pattern represents. W represents any item with the minecraft:logs tag (all logs). R represent the redstone item specificly. For more information about tags see here

In total, the crafting recipe would look like this:

For more information about the format of basic recipes, see here.

The type value can be changed to support a custom recipe [more information needed].