blob2buffer and buffer2blob

blob.buffer.utils.js

const { Blob } = require('node:buffer');

/**
 * Converts a Buffer to a Blob.
 * 
 * @param {Buffer} buffer the Buffer to convert
 * @returns {Blob} the converted Buffer as a Blob
 */
function buffer2blob(buffer) {
  if (buffer instanceof Buffer === false) {
    throw new Error('not an instance of a Buffer')
  }
  return new Blob([buffer])
}

/**
 * Converts a Blob to a Buffer.
 * 
 * @param {Blob} blob the Blob to convert
 * @returns {Buffer} the converted Blob as a Buffer
 */
async function blob2buffer(blob) {
  if (blob instanceof Blob === false) {
    throw new Error('not an instance of a Blob')
  }

  const arrayBuffer = await blob.arrayBuffer()
  return Buffer.from(arrayBuffer, 'binary')
}