The swiss army knife for binary data in JavaScript.

Usage no npm install needed!

<script type="module">
  import bytebuffer from '';


bytebuffer.js - The swiss army knife for binary data in JavaScript.">

A fast and complete ByteBuffer implementation using either ArrayBuffers in the browser or node Buffers under node.js, generated from a single source tree through MetaScript.

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  • Three API-compatible versions:
    • bytebuffer   Backing buffer: ArrayBuffer, Accessor: Uint8Array
    • bytebuffer-dataview   Backing buffer: ArrayBuffer, Accessor: DataView
    • bytebuffer-node   Backing buffer / Accessor: node Buffer
  • 8, 16, 32 and 64 bit (through long.js) signed and unsigned integers
  • 32 and 64 bit floats
  • Varints as used in protobuf (32 and 64 bit, zig-zag)
  • Base64, utf8, binary, hex and debug encodings
  • Handy string and debugging utilities
  • Big and little endianness
  • Relative and absolute zero-copy operations wherever possible
  • Transparent resizing when using unknown-length data
  • Chaining of all operations that do not return a specific value
  • Slicing, appending, prepending, reversing, flip, mark, reset, etc.


The library is compatible with CommonJS and AMD loaders and is exposed globally as dcodeIO.ByteBuffer if neither is available.

var ByteBuffer = require("bytebuffer");

var bb = new ByteBuffer()
            .writeIString("Hello world!")
console.log(bb.readIString()+" from bytebuffer.js");

In the browser, 64 bit integer support is optional and present only if Long.js has been loaded prior to bytebuffer.js.



Support for IE<10, FF<15, Chrome<9 etc.

  • Use bytebuffer-dataview with a polyfill (see)


Dretch (IE8 compatibility)


License: Apache License, Version 2.0 - Logo derived from W3C HTML5 Logos (CC A 3.0)