JAVASCRIPT

nodejs write raw buffer to file

/*
	Using nodejs' fs module you can create a WriteStream
    to handle raw stream of bytes and buffers.
*/

const path = "path/to/the/file";

array = BigInt64Array(0);
buffer = Buffer.from(array.buffer)

fs.createWriteStream(path).write(buffer);

write buffer to file in node

fs = require('fs');
fs.writeFile('helloworld.txt', 'Hello World!', function (err) {
  if (err) return console.log(err);
  console.log('Hello World > helloworld.txt');
});

javascript buffer to file

  function bufferToFile(
    buffer,
    filename,
    type = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
  ) {
    let blob = new Blob([buffer], { type });
    const anchor = document.createElement('a');
    const url = URL.createObjectURL(blob);
    anchor.href = url;
    anchor.download = filename;
    document.body.appendChild(anchor);
    anchor.click();
    document.body.removeChild(anchor);
    URL.revokeObjectURL(url);
  }