https://medium.com/@remarkablemark/how-to-generate-sha-256-hash-with-javascript-d3b2696382fd

browser-hash.js

function hash(string) {
  const utf8 = new TextEncoder().encode(string);
  return crypto.subtle.digest('SHA-256', utf8).then((hashBuffer) => {
    const hashArray = Array.from(new Uint8Array(hashBuffer));
    const hashHex = hashArray
      .map((bytes) => bytes.toString(16).padStart(2, '0'))
      .join('');
    return hashHex;
  });
}