Question How do i get nbt tags

[DruideMante]

I'm working on a custom tool but i need to get tool tags to know that it is not just a simple pickaxe. How can i do that?

 

[RimeOrReason]

I don't know if there's a better way but you can use tr7zw's item nbt api, create a new NBTItem with the itemstack you have and then use hasTag and setString, setInt etc. methods according to what you need.
An example in kotlin:

val item = ItemStack(Material.HOPPER)
val nbtitem = NBTItem(item)
nbtitem.setString("collector", this::class.java.simpleName)
nbtitem.setString("material", material.name)
player.inventory.addItem(nbtitem.item)

An example in a listener to see if the tool has the tags:

@EventHandler
fun onPlace(event: BlockPlaceEvent) {
    if (event.isCancelled) return
    if (!event.itemInHand.hasItemMeta()) return
    val nbtitem = NBTItem(event.itemInHand)
    if (!nbtitem.hasTag("collector") || !nbtitem.hasTag("material")) return
    //whatever you want to do with the item
}

 

[Notro]

Hello, you could make NBT tags with tr7zw's item NBT api as already mentioned above, or you could use PersistentDataContainer which is built in by Paper in their api.
Both ways are great anyways.