Lego Dimensions NFC213 Tag Generator

This project is a Node.js console application that generates the required HEX data to program replacement Toy Tags for the game Lego Dimensions using NFC213 tags.
The application takes the UID from a blank NFC213 tag and a Character or Vehicle ID, and produces the values that need to be written to the NFC tag so it can be used with the Lego Dimensions Toy Pad.

⚠️ This project is for educational purposes and to preserve access to Lego Dimensions, a game and hardware ecosystem no longer manufactured. You must supply your own NFC213 tags.

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Prerequisites

• Blank NFC213 tags
• The Smart NFC app (from the iOS App Store)
• Node.js installed on your computer

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Step 1 — Reading Your NFC213 Tag UID

1. Install and open Smart NFC on your iPhone.
2. Tap on Advanced and make sure the protocol is set to ISO 14443.
   • If you don’t do this, you may get an error that the tag does not contain an NDEF message.
3. Scan your blank NFC213 tag.
4. Scroll down to view the lines/blocks.
   • Copy the first 6 characters of line 1 (Block 00) and all 8 characters of line 2 (Block 01).
   • Combine them into your UID.
   • Drop the last 2 characters from line 1.
   • Example:

     Line 1 (0x00): ABCDEF01
     Line 2 (0x01): 2345678
     UID = ABCDEF2345678
     

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Step 2 — Running the Console Application

1. Clone or download this repository.
2. Install dependencies:

   git clone https://github.com/sys-MWell/lego-dimensions-nfc-writer.git
   cd lego-dimensions-nfc-writer
   

3. In your terminal, run the generator:

   node generator/generateToyTag.js
   

4. The console will prompt you:

   Enter NFC’s UID:
   

   • Enter the UID you obtained from Smart NFC.
5. Next, you’ll be prompted:

   Enter character or vehicle ID ([Character or Vehicle ID] or [C] for all Characters or [V] for all Vehicles):
   

   • Enter a valid Character or Vehicle ID.
   • IDs can be found in charactermap.json and vehiclemap.json.
6. The program will output the required page numbers and HEX values for your NFC tag.

   Example Output

   • For UID 1D0D830E960000 and Batman (ID = 1):

   ... [Page  35] [Page  36] [Page  37] [Page  38] ... [Page  43] 
   ... [    0x23] [    0x24] [    0x25] [    0x26] ... [    0x2B] 
   ... [00000000] [A4027C05] [33217F87] [00000000] ... [4574C79D]
   

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Step 3 — Writing to Your NFC213 Tag

1. In the Smart NFC app, open the blank tag again.
2. Update only the following lines with the generated values:
   • Line 35 (0x23)
   • Line 36 (0x24)
   • Line 37 (0x25)
   • Line 38 (0x26)
   • Line 43 (0x2B)
3. Rules:
   • Do not edit any other lines.
   • Only update one block at a time.
   • After entering new data, tap WRITE and scan the tag again.
   • Repeat until all changes are written.
4. Place the tag on the Lego Dimensions Toy Pad.
   • Your character/vehicle should appear in-game from the vortex!

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How Character and Vehicle Tag Codes Work

The data written to your tag determines whether it’s a character or vehicle:

• Line 35 (0x23): Always 00000000
• Lines 36–37: Based on Character/Vehicle ID
  • Characters: Derived from UID + Character ID → unique per tag
  • Vehicles:
    • Line 36 = based solely on Vehicle ID
    • Line 37 = always 00000000
• Line 38 (0x26): Identifies token type
  • Characters = 00000000
  • Vehicles = 00010000
• Line 43 (0x2B): Based solely on UID

Example — Vehicle (Bad Cop’s Police Car, Vehicle ID 1000)

Line 35 (0x23): 00000000
Line 36 (0x24): E8030000
Line 37 (0x25): 00000000
Line 38 (0x26): 00010000
Line 43 (0x2B): [Generated from UID]

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Credits

This project is built upon and inspired by community contributions:

• AlinaNova21 — node-ld.
• iroteta — Provided list_of_characters.json and list_of_vehicles.json.
• Reddit threads & tutorials:
  • NFC cloning using iOS
  • How to make NFC tags for Lego Dimensions
  • How to write Lego Dimensions NFC tags with MiFARE++ Ultralight
  • Chteupnin’s LD Project Discord — Community-driven support and development.
    • Discord invite
    • Chteupnin’s LD Generation Website

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Notes

• This project replicates the functionality of the now-defunct ldcharcrypto site.
• The console application does not emulate the official Toy Pad, but instead provides raw HEX for use with NFC writing apps like Smart NFC.
• The project was created as a learning experience in Node.js, debugging, and working with existing open-source code.