eznbt
v1.1.3
Published
Easy Minecraft NBT reading and writing
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eznbt
Easy Minecraft NBT reading and writing
Prerequisites
Make sure to use a node version that supports BigInts, they're used for the Long NBT Tag
Usage
Pretty much all you need to know is that PascalCase members of eznbt
are classes that can be used for both reading
and writing. Its constructors accept an object containing either a value
or buffer
property, from which the class
is then constructed. The instance will contain a value
and buffer
property.
For ease of use lowercase members of eznbt
can be used to construct classes like this: int(5)
(instead of
new Int({ value: 5 })
)
Writing stuff
import NBT from 'eznbt'
const { NBTString, string, rootcompound } = NBT
/* NBT files are usually implicitly in a compound. If this is the case you should use
* a named RootCompound. You name it by providing a [Symbol.for('NBTRootTagName')] string.
*/
const myCompound = rootcompound({
[Symbol.for('NBTRootTagName')]: 'rootTagName',
myStr: new NBTString({ value: 'hello' }),
// is equivalent to
myStr2: new NBT.String({ value: 'hello' }),
// is equivalent to
myStr3: string('hello'),
// is equivalent to
myStr4: 'hello'
})
myCompound.buffer // ready to send to your client/server
Reading stuff
import NBT from 'eznbt'
const { Compound } = NBT
const myBuffer = ... // a buffer you received. it is an nbt compound tag (as always)
const myCompound = new Compound({ buffer: myBuffer })
myCompound.value // yields the compound as an object. children are NBT Tag instances
myCompound.json // yields the compound as an object. children are JS types (number, string, bigint, etc.)
Reading and writing lists
Lists are special because they have one set type, which you will first have to pass to the List
or list
function.
import NBT from 'eznbt'
const { List, list, NBTString } = NBT
const myList = list(NBTString)('hello', 'world!') // creates a string-list
// When the type of the list is unknown, it can only be used to read stuff:
const { value } = new (List())({ buffer: myList.buffer })
Compound shorthands
The compound tag comes with a few handy shorthands
import NBT from 'eznbt'
const { int, compound } = NBT
const myCompound = compound({
myList: [int(5), int(6)], // creates an int-list
myLong: 5n, // creates a long
myStr: 'hello world!', // creates a string
// creates a compound
myCompound: {
myLongList: [5n, 6n, 7n] // creates a long-list
}
})
Compound vs RootCompound
Since generally all NBT files are implicitly in a compound tag, you should probably always use RootCompound for the outside object, and Compound otherwise
// RootCompound.json vs Compound.json
// RootCompound.json will put all values as a property of the root compound's name
rootcompound({ a: 1, b: 2, [Symbol.for('NBTRootTagName')]: 'hello!' }).json
/** {
* 'hello!': {
* a: 1,
* b: 2
* }
* }
*/
// Compound doesn't have a name so it won't be named
compound({ a: 1, b: 2 }).json
/** {
* a: 1,
* b: 2
* }
*/
Typescript
This package has been made using Typescript and ships with type declarations.