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3.0.4 • Public • Published


A Node and Bun compatible buffer tool that permit easier binary manipulation.

License Version

Basic installation and usage

You can install this package by using your preferred node package manager (NPM, PNPM, Yarn, etc) or bun

npm install bufferutility # NPM
pnpm add bufferutility # PNPM
yarn add bufferutility # Yarn
bun add bufferutility # Bun

You can then start using the package by requiring it from your application as such:

import { BufferUtility } from 'bufferutility';

Common Usage

Create a new BufferUtility

import { BufferUtility } from 'bufferutility';

const buffer = new BufferUtility();

// <BufferUtility>

buffer[0] = 0xfa; // or buffer.writeByte(0xfa, 0);

// <BufferUtility fa>

console.log(buffer[0]); // or console.log(buffer.readByte(0));
// 250

Create a BufferUtility with different modules

BufferUtility actually have 3 modules you can use

  • Uint8ArrayModule (compatible with Node and Bun): It use an Uint8Array to store the data (default module).
  • NodeBufferModule (compatible with Node): It use a NodeJS Buffer to store the data.
  • FileSystemModule (compatible with Node and Bun): It use a file to store the data (permit "infinite" size).
// Uint8Array module
import { BufferUtility, Uint8ArrayModule } from 'bufferutility';

const Uint8Buffer = new BufferUtility([], {
  module: Uint8ArrayModule


console.log(Uint8Buffer.buffer) // Uint8Array(1) [ 15 ]

// Node Buffer module
import { BufferUtility, NodeBufferModule } from 'bufferutility';

const NodeBuffer = new BufferUtility([], {
  module: NodeBufferModule


console.log(NodeBuffer.buffer) // <Buffer 0f>

// File System module
import { BufferUtility, FileSystemModule } from 'bufferutility';

const FSBuffer = new BufferUtility("file.txt", {
  module: FileSystemModule


import { readFileSync } from 'fs';

console.log(readFileSync("file.txt", "utf8")) // data

// FSBuffer.buffer return the file descriptor

Function: BufferUtility


  • obj : <Object>
  • Returns : <boolean>

Returns true if obj is a BufferUtility, false otherwise.

const buf1 = new BufferUtility("a BufferUtility");
const buf2 = Buffer.from("a Node Buffer");

// true

// false

byteLength(string[, encoding])

See https://nodejs.org/api/buffer.html#buffer_static_method_buffer_bytelength_string_encoding

Class: BufferUtility

new BufferUtility([data[, opts]])

  • data : <String> | <Array> | <Buffer> | <Uint8Array> | <Number> A property determinate the value of the BufferUtility. Default: undefined (empty)
  • opts : <Object> Set of configurable options to set on the Buffer. Can have the following fields:
    • module : <Module> The module used by the Buffer. Default: <Uint8ArrayModule>.
    • maxArrayLength : <Number> The max length an ArrayBuffer can take. Default: buffer.kMaxLength.
    • returnAsBigIntIfOverflow: <Boolean> Return a BigInt for read functions if value is under Number.MIN_SAFE_INTEGER or greater than Number.MAX_SAFE_INTEGER. Default: true.
    • returnAsBigInt: <Boolean> Always return a BigInt for read functions (override returnAsBigIntIfOverflow). Default: false.
    • offset : <Number> The forced start offset of the buffer source. Default: 0.
    • length : <Number> The forced length of the buffer source. Default: buf.length.
  • Returns : <BufferUtility>

Create a new BufferUtility instance from data and opts properties

const buf1 = new BufferUtility(); // Empty buf
const buf2 = new BufferUtility("test"); // Buf with test in bytes
const buf3 = new BufferUtility(64); // Alloc 64 bytes
const buf4 = new BufferUtility([54, 76]); // Buf with bytes 54 and 76

More documentation

More documentation on this readme will come soon, they are approximately the same as the version 2. You can check them here https://github.com/pharuxtan/BufferUtility/blob/v2/README.md#bufferutility

read7BitEncodedInt/read7BitEncodedInt64/write7BitEncodedInt/write7BitEncodedInt64 is replaced by readULEB128/writeULEB128/readSLEB128/writeSLEB128

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