Buffers can be used for taking a string or piece of data and doing Base64 encoding of the result. For example:

> console.log(Buffer.from("Hello World").toString('base64'));
SGVsbG8gV29ybGQ=
> console.log(Buffer.from("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'))
Hello World

The Buffer constructor is a global object, so no require is needed. Buffers created with strings can take an optional encoding parameter to specify what encoding the string is in. The available toString and Buffer constructor encodings are as follows:

'ascii' - for 7 bit ASCII data only. This encoding method is very fast, and will strip the high bit if set.

'utf8' - Multi byte encoded Unicode characters. Many web pages and other document formats use UTF-8.

'ucs2' - 2-bytes, little endian encoded Unicode characters. It can encode only BMP(Basic Multilingual Plane, U+0000 - U+FFFF).

'base64' - Base64 string encoding.

'binary' - A way of encoding raw binary data into strings by using only the first 8 bits of each character. This encoding method is deprecated and should be avoided in favor of Buffer objects where possible. This encoding will be removed in future versions of Node.

function base64ToArrayBuffer(base64) {
    var binaryString = atob(base64);
    var bytes = new Uint8Array(binaryString.length);
    for (var i = 0; i < binaryString.length; i++) {
        bytes[i] = binaryString.charCodeAt(i);
    }
    return bytes.buffer;
}

function _arrayBufferToBase64( buffer ) {
    var binary = '';
    var bytes = new Uint8Array( buffer );
    var len = bytes.byteLength;
    for (var i = 0; i < len; i++) {
        binary += String.fromCharCode( bytes[ i ] );
    }
    return window.btoa( binary );
}

but, non-native implementations are faster e.g. https://gist.github.com/958841 see http://jsperf.com/encoding-xhr-image-data/6

jsPerf.com is jsPerf.app now: https://jsperf.app/encoding-xhr-image-data/51

Updated benchmarks: https://jsben.ch/wnaZC

try this

const slugId1 = 'YriU6QbcQj6xtdUUosJTxA==';
const slugId2 = 'Su7Zvq1vRca/teTNfEmfNQ==';
const SLUGID_SIZE = 16;

let buffer = Buffer.alloc(SLUGID_SIZE * 2);

buffer.write(slugId1, 0, SLUGID_SIZE, 'base64');
buffer.write(slugId2, SLUGID_SIZE, SLUGID_SIZE, 'base64');

console.log(buffer.toString('base64', 0, SLUGID_SIZE));
console.log(buffer.toString('base64', SLUGID_SIZE, SLUGID_SIZE * 2));

buffer.toString() - third argument is not length, it is end offset.