Generate sha256 hash for a buffer - browser and node.js

sha256-hash-nodejs-browser.js

/*
 * Sometimes you want to hash stuff on the client and on the server to test if
 * data transmission is happening okay. These functions to that.
 */


// node.js
import crypto from 'node:crypto';

async function calculateHashForArrayBuffer(data: ArrayBuffer) {
  return calculateHashForBuffer(Buffer.from(data));
}
async function calculateHashForBuffer(data: Buffer) {
  const hash = crypto.createHash('sha256');
  hash.update(data);
  return hash.digest('hex');
}


// browser
async function calculateHash(data: BufferSource) {
  const hashBuffer = await window.crypto.subtle.digest('SHA-256', data);
  return Array.from(new Uint8Array(hashBuffer))
    .map((b) => b.toString(16).padStart(2, '0'))
    .join('');
}