My Recipe Serializer

public class MyRecipeSerializer implements RecipeSerializer<MyRecipe> {

    private MyRecipeSerializer() {}

    public static final MyRecipeSerializer INSTANCE = new <MyRecipeSerializer();
    public static final Identifier ID = new Identifier("modid:my_recipe");

    @Override
    public MyRecipe read(Identifier id, JsonObject json) {
        MyRecipeJsonFormat recipeJson = new Gson().fromJson(json, MyRecipeJsonFormat.class);

        if(recipeJson.input == null || recipeJson.outputItem == null) { throw new JsonSyntaxException("Missing Attributes in Recipe!"); }
        Ingredient input = Ingredient.fromJson(recipeJson.getInput());
        Item outputItem = Registry.ITEM.getOrEmpty(new Identifier(recipeJson.getOutputItemId())).orElseThrow(() -> new JsonSyntaxException("The Item " + recipeJson.outputItem + " does not exist!"));
        ItemStack outputStack = new ItemStack(outputItem, recipeJson.getOutputCount());

        return new MyRecipe(input, outputStack, id);
    }

    @Override
    public MyRecipe read(Identifier id, PacketByteBuf buf) {

        Ingredient input = Ingredient.fromPacket(buf);
        ItemStack output = buf.readItemStack();

        return new MyRecipe(input, output, id);
    }

    @Override
    public void write(PacketByteBuf buf, MyRecipe recipe) {
        recipe.getInput().write(buf);
        buf.writeItemStack(recipe.getOutput());
    }
}