Advanced Mode

Advanced Mode provides a full NBT tree editor.

It lets you view and edit all data components on an item.

Internally, it serializes the whole ItemStack via ItemStack.CODEC into a CompoundTag.

On save, it deserializes it back.

Layout

• Left sidebar: item info panel (item ID, stack count, component count)

• Right panel: NBT tree view

• Top bar: title, mode toggle (Easy/Advanced), search bar, action buttons

• Bottom status bar: status messages

Tree view

The NBT tree shows all components in a hierarchy:

• Compound {}: named children (curly braces)

• List []: ordered children (square brackets)

• Primitive tags: Byte, Short, Int, Long, Float, Double, String

• Array tags: ByteArray, IntArray, LongArray

Each tag type uses a different color:

Tag type	Color
Compound	White
List	Light blue
String	Green
Numbers (Byte/Short/Int/Long)	Gold / Yellow
Decimals (Float/Double)	Orange
Arrays	Cyan

Navigate the tree

Action	How
Select a node	Click it
Up/down navigation	Arrow keys (Up/Down)
Expand/collapse	Double-click, press E, or click the arrow
Expand all	Top bar: "Expand all"
Collapse all	Top bar: "Collapse all"

Edit values

1

Select a node

Select a tag node in the tree.

2

Open the editor

Double-click or press Enter to edit its value.

3

Validation rules

Input is validated based on tag type:

• String: any text

• Byte: integer -128 to 127

• Short: integer -32768 to 32767

• Int: integer -2,147,483,648 to 2,147,483,647

• Long: integer -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

• Float/Double: decimals

4

Apply or cancel

• Press Enter or click Confirm to apply.

• Press Esc to cancel.

Create new tags

1

Pick the target container

Select a Compound or List node.

2

Open the create menu

Click "+ New" in the top bar.

3

Choose the type

Pick a tag type from the dropdown.

4

Enter name and value

Enter the tag name (required for Compound children) and the value.

5

Done

Confirm to add the new tag.

Supported types: Byte, Short, Int, Long, Float, Double, String, ByteArray, IntArray, LongArray, List, Compound.

Delete tags

1

Select the tag

Select the tag you want to delete.

2

Delete

Press Delete or click the delete button.

3

Result

The tag and all of its children (if any) will be removed.

Search / filter

1

Start searching

Click the search icon, or type in the search bar.

2

Filter results

The tree filters to matching nodes.

3

Matching scope

Search matches:

• Keys: tag names

• Values: tag values

• Types: tag type names

4

Restore full tree

Clear the search to show everything again.

Sidebar info

The left sidebar shows:

• Item icon (rendered)

• Item ID (for example minecraft:diamond_sword)

• Stack count (for example x1)

• Component count (total)

Saving and tools

• Press Ctrl+S to save to the item (Creative only).

• Advanced Mode also provides Export and Import for NBT files.

• Use Copy NBT to copy the full tree as text.

Tips

• If you mess up, just close without saving.

  The original item stays unchanged.

• The tree is collapsed by default.

  Set treeExpandedByDefault: true to auto-expand.

• Switch back to Easy Mode anytime for common edits.