Creating a crafting recipe is very easy. The normal recipes and advanced recipes are created via the same GUI.

Create the recipe

1. Choose the Crafting Table setting:

2. Click on "Create Recipe" (only for v1.6.5.x or older):

3. Configure your recipe:

Place the items you want into the ingredient and result slot.
You can Shift + Right-Click on each slot to configure multiple items for the result or variants for ingredients.
e.g.:

Advanced Crafting Table: Using the condition menu on top you can enable the recipe to only work inside the Advanced Crafting Table.

4. Save Your recipe:

Click on "Save as..." Button (Bottom right, Book) and type in the namespaced key.
e.g. /wui warrior emerald_sword
Where warrior is the namespace and emerald_sword the key of the recipe.
If you are editing a recipe it will also display a "Save" button, which will save the recipe with the namespaced key of the recipe you are editing.

5. Done! Your recipe has been saved! You can test it :

Advanced Crafting Table Setting

For crafting recipes you can enable the advanced option. This option allows the recipe to be crafted inside the Advanced Crafting Table only.

JSON structure

Shapeless

{
    "@type" : "customcrafting:crafting_shapeless",
    "group" : "",
    "hidden" : false,
    "vanillaBook" : false,
    "priority" : "NORMAL",
    "checkNBT" : true,
    "conditions" : {
        "values" : [ /* Conditions */ ]
    },
    "result" : { /* Result settings */ },
    "ingredients" : [ 
        {
          //Ingredient settings
        }, 
        //...ingredients
    ]
}

Shaped

{
  "@type" : "customcrafting:crafting_shaped",
  "group" : "",
  "hidden" : false,
  "vanillaBook" : false,
  "priority" : "NORMAL",
  "checkNBT" : true,
  "conditions" : {
    "values" : [ /* Conditions */ ]
  },
  "result" : { /* Result settings */ },
  "symmetry" : {
    "horizontal" : false,
    "vertical" : false,
    "rotate" : false
  },
  //Shape that represents the 3×3 grid.
  //Use spaces for empty slots. Rows and Columns, that are completely empty
  //can be left out.
  "shape" : [ "123", "456", "789" ],
  "ingredients" : {
    "<key_in_shape>": { /* Ingredient settings */ }
  }
}