nbt_types.md

NBT Types

Type ID	Type Name	MCP Class Name	Payload Size (Bytes)	Description
0	TAG_End	NBTTagEnd	0	Signifies the end of a TAG_Compound. It is only ever used inside a TAG_Compound, and is not named despite being in a TAG_Compound.
1	TAG_Byte	NBTTagByte	1	A single signed byte.
2	TAG_Short	NBTTagShort	2	A single signed, big endian 16 bit integer.
3	TAG_Int	NBTTagInt	4	A single signed, big endian 32 bit integer.
4	TAG_Long	NBTTagLong	8	A single signed, big endian 64 bit integer.
5	TAG_Float	NBTTagFloat	4	A single, big endian IEEE-754 single-precision floating point number.
6	TAG_Double	NBTTagDouble	8	A single, big endian IEEE-754 double-precision floating point number.
7	TAG_Byte_Array	NBTTagByteArray	...	A length-prefixed array of signed bytes. The prefix is a signed integer (thus 4 bytes).
8	TAG_String	NBTTagString	...	A length-prefixed modified UTF-8 string. The prefix is an unsigned short (thus 2 bytes) signifying the length of the string in bytes.
9	TAG_List	NBTTagList	...	A list of nameless tags, all of the same type. The list is prefixed with the Type ID of the items it contains (thus 1 byte), and the length of the list as a signed integer (a further 4 bytes). If the length of the list is 0 or negative, the type may be 0 (TAG_End) but otherwise it must be any other type. (The notchian implementation uses TAG_End in that situation, but another reference implementation by Mojang uses 1 instead; parsers should accept any type if the length is <= 0).
10	TAG_Compound	NBTTagCompound	...	Effectively a list of named tags. Order is not guaranteed.
11	TAG_Int_Array	NBTTagIntArray	...	A length-prefixed array of signed integers. The prefix is a signed integer (thus 4 bytes) and indicates the number of 4 byte integers.
12	TAG_Long_Array	NBTTagLongArray	...	A length-prefixed array of signed longs. The prefix is a signed integer (thus 4 bytes) and indicates the number of 8 byte longs.