NBTviewer

NBTviewer is a lightweight client-side NeoForge mod that displays NBT (SNBT) data directly in-game.

It is designed for modders, pack makers, and advanced players who want to inspect, debug, and understand data instantly — without commands or external tools.

Main Features

NBT directly in tooltips

• Displays the full SNBT of the hovered item directly in its tooltip

Entity NBT overlay

• Press N to toggle entity NBT display while looking at entities
• Displays key entity data directly on the player HUD
• Works seamlessly alongside item tooltips

Entity lock system

• Shift + L to lock the currently targeted entity
• Keeps displaying its NBT even when not looking at it anymore

Advanced entity NBT viewer

• Shift + O to open a clean and scrollable interface
• Better readability for large and complex NBT structures
• Includes a copy button for quick access

Hold SHIFT to show (optional)

• By default, NBT is only shown while holding SHIFT
• Optional hint line when SHIFT is not held

Syntax highlighting (HEX colors)

• Keys
• Strings
• Numbers
• Booleans
• Punctuation ({ } [ ] , :)
• Identifiers

All colors are configurable using HEX format (#RRGGBB).

Formatting modes

• Single-line: compact raw SNBT on one line
• Multi-line: formatted with indentation and line breaks

Includes safety limits to avoid excessively large tooltips.

Safe truncation & limits

• Maximum total character count
• Maximum line length
• Configurable indentation size

Tooltip scaling

• Auto-scale: adapts to NBT size and line count
• Manual scale: fixed size (ignored when auto-scale is enabled)

Copy NBT to clipboard

• Press CTRL + SHIFT + C to copy item SNBT
• Optional feedback:
  • Small popup confirmation
  • Optional local sound effects (client-side only)

Configuration

• SHIFT-only display
• Single-line or multi-line formatting
• Tooltip hint lines
• Tooltip size limits
• Indentation spacing
• Auto-scale or manual scale
• Clipboard popup and sounds
• Full HEX color customization

Multiplayer

• Client-side only
• No server installation required
• No network traffic
• Only affects local tooltips

Language Support

• English
• French
• German
• Spanish
• Italian
• Portuguese (Brazil)