from

BufferConstructor.from

**from**(arrayBuffer, byteOffset?, length?): [Buffer](/references/product/variables/Buffer-1)

Allocates a new Buffer using an array of bytes in the range 0 – 255. Array entries outside that range will be truncated to fit into it.

import { Buffer } from 'node:buffer';

// Creates a new Buffer containing the UTF-8 bytes of the string 'buffer'.
const buf = Buffer.from([0x62, 0x75, 0x66, 0x66, 0x65, 0x72]);

If array is an Array-like object (that is, one with a length property of type number), it is treated as if it is an array, unless it is a Buffer or a Uint8Array. This means all other TypedArray variants get treated as anArray. To create a Buffer from the bytes backing a TypedArray, use Buffer.copyBytesFrom().

A TypeError will be thrown if array is not an Array or another type appropriate for Buffer.from() variants.

Buffer.from(array) and Buffer.from(string) may also use the internalBuffer pool like Buffer.allocUnsafe() does.

Parameters

arrayBufferWithImplicitCoercion<ArrayBuffer | SharedArrayBuffer>Required

byteOffsetnumber

lengthnumber

Returns

Buffer

BufferBufferRequired

Since

v5.10.0

**from**(data): [Buffer](/references/product/variables/Buffer-1)

Creates a new Buffer using the passed {data}

Parameters

dataUint8Array | readonly number[]Required

data to create a new Buffer

Returns

Buffer

BufferBufferRequired

**from**(data): [Buffer](/references/product/variables/Buffer-1)

Parameters

dataWithImplicitCoercion<string | Uint8Array | readonly number[]>Required

Returns

Buffer

BufferBufferRequired

**from**(str, encoding?): [Buffer](/references/product/variables/Buffer-1)

Creates a new Buffer containing the given JavaScript string {str}. If provided, the {encoding} parameter identifies the character encoding. If not provided, {encoding} defaults to 'utf8'.

Parameters

strWithImplicitCoercion<string> | &#123; [toPrimitive]: Method [toPrimitive] &#125;Required

encodingBufferEncoding

Returns

Buffer

BufferBufferRequired