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Minecraft NBT Specification

Reference: Minecraft Gamepedia

Tag Types

  • Byte
  • Short (signed 2 bytes Big Endian)
  • Int (signed 4 bytes Big Endian)
  • Long (signed 8 bytes Big Endian)
  • Float (signed 4 bytes IEEE 754-2008 Big Endian)
  • Double (signed 4 bytes IEEE 754-2008 Big Endian)
  • ByteArray (variable size of bytes)
  • String (string w/o 0-terminator)
  • List (list of tags of same type)
  • Compound (container for other tags)
  • IntArray (variable size of 4 bytes)
  • LongArray (variable size of 8 bytes)

Context Free Grammar

  • Name -> short_lit string

  • Compound -> 0a Name InnerCompound 00

  • InnerCompound -> Tag InnerCompound | epsilon

  • IntPayloadSize -> int_lit

  • TypeId -> 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 0a | 0b | 0c

  • Tag -> Byte | Short | Int | Long | Float | Double | ByteArray | String | List | Compound | IntArray | LongArray

  • Byte -> 01 Name byte_lit

  • Short -> 02 Name short_lit

  • Int -> 03 Name int_lit

  • Long -> 04 Name long_lit

  • Float -> 05 Name float_lit

  • Double -> 06 Name double_lit

  • ByteArray -> 07 Name IntPayloadSize ByteArrayList

  • String -> 08 Name ShortPayloadSize ByteArrayList

  • List -> 09 Name TypeId IntPayloadSize PayloadList

  • Compound -> 0a Name InnerCompound 00

  • IntArray -> 0b Name IntPayloadSize IntArrayList

  • LongArray -> 0c Name IntPayloadSize LongArrayList

  • ${i}ArrayList -> ${i} ${i}ArrayList | epsilon