createFileHash.js

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

function createHash(file) {
  return new Promise((resolve, reject) => {
    const hash = crypto.createHash("sha256");
    const stream = fs.createReadStream(file);

    stream.on("data", (chunk) => {
      hash.update(chunk);
    });

    stream.on("end", () => {
      const hashHex = hash.digest("hex");
      console.log(`Hash Created: ${hashHex}`);
      return resolve(hashHex);
    });

    stream.on("error", (err) => reject(err));
  });
}

createHash("./MyDoc.md").catch(console.log);