Getting the hash of a file(request.integrity)

getIntegrity.js

const fs = require("fs");
const crypto = require("crypto");

// the file you want to get the hash
const stream = fs.createReadStream("xxx.ext");
const hash = crypto.createHash("sha256");
console.log("hash", hash);

hash.setEncoding("base64");

stream.on("end", function () {
  hash.end();
  console.log(hash.read()); // the desired sha256sum
});

// read all file and pipe it (write it) to the hash object
stream.pipe(hash);