How to get binary string from ArrayBuffer?

Question

What is the way to obtain binary string from ArrayBuffer in JavaScript?

I don\'t want to encode the bytes, just get the binary representation as String.

Tha

Answer 1

This has been made much simpler by additions to JavaScript in recent years – here's a one-line method to convert a Uint8Array into a binary-encoded string:

const toBinString = (bytes) =>
  bytes.reduce((str, byte) => str + byte.toString(2).padStart(8, '0'), '');

Example:

console.log(toBinString(Uint8Array.from([42, 100, 255, 0])))
// => '00101010011001001111111100000000'

If you're starting with an ArrayBuffer, create a Uint8Array "view" of the buffer to pass into this method:

const view = new Uint8Array(myArrayBuffer);
console.log(toBinString(view));

Source: the Libauth library (binToBinString method)