How can I see the entity data of an existing item?

Question

I'm using Thaumcraft, which adds a bunch of new items. One in particular (research note) is useless without the correct NBT tags. Unfortunately, I don't know what the correct NBT tags look like.

How can I see the entity data of an existing item so that I can find the NBT tags I need?

Answer 1

In 1.13+, you can hold the item in your hand and type:

/data get entity @s SelectedItem

You can copy this from the output log, if you want to avoid retyping it all.

The corresponding /give command would be:

/give @s minecraft:enchanted_book{StoredEnchantments:[{lvl:1s,id:"minecraft:protection"}]}

(note how the extra NBT gets automatically placed inside the tag tag)

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In 1.8 to 1.12, you'll need to throw down the item in front of you and then type:

/entitydata @e[type=Item,r=3] {}

In chat you'll see all of the data of the item entity, which includes stuff like its motion and age. For the item itself, look at the tags inside the Item: compound tag, highlighted in green below:

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Alternatively, you can use an external program such as NBTExplorer to open up the world, then your player's inventory, then find the item you want to look at the tags of.

Answer 2

Just in case, as of ItemsAdder 3.4.1-r4, the following command should return entity data, including NBT, of an item currently being held by a player Player1:

/data get entity @p[name=Player1] SelectedItem

If it does not output anything in-game, you might want to try it on the server console.

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In case of ItemsAdder, CustomModelData should be possible to obtain via /iacustommodeldata <namespace>:<item> (as in items.yml of the corresponding resource pack). The range of the value ItemsAdder sets to auto-generated items is defined in the plugin's config.yml (as of v3.4.1-r4).

Related: https://itemsadder.devs.beer/plugin-usage/commands