Use crypto subtle digest to create hash hex string

Hash.js

// 5 March 2022
// Using window.crypto.subtle.digest() 
// @param "sha-256" or other algorithm
// @param DataView with ArrayBuffer or just ArrayBuffer

// Not my own.

// Copy+paste+modified from
// https://stackoverflow.com/a/68545495

/**
 * @function Hex converts a Uint8Array to a hex string using the supplied algorithm.
 * @param {"SHA-1"|"SHA-256"|"SHA-384"|"SHA-512"} algorithm https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest
 * @param Uint8Array msgUint8
 * @returns Promise hexString
 */
async function Hex(algorithm, msgUint8) {
  // https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest#converting_a_digest_to_a_hex_string
  var hashBuffer = await crypto.subtle.digest(algorithm, msgUint8)
  var hashArray = Array.from(new Uint8Array(hashBuffer))

  // convert bytes to hex string
  return hashArray.map(function(b) {
    return b.toString(16).padStart(2, '0')
  }).join('');
}

/**
 * @function Hash passes data to the Hex function and returns a hex string using the supplied algorithm. Data may be a string or a Blob.
 * @param {"SHA-1"|"SHA-256"|"SHA-384"|"SHA-512"} algorithm https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest
 * @param {string|Blob} data
 * @returns Promise hexString
 */
async function Hash(algorithm, data) {
  
  if (data instanceof Blob) {
    var arrayBuffer = await data.arrayBuffer()
    var msgUint8 = new Uint8Array(arrayBuffer)
    
    return await Hex(msgUint8)
  }
  
  var encoder = new TextEncoder()
  var msgUint8 = encoder.encode(data)
  
  return await Hex(algorithm, msgUint8)
}


// Create a source
var source = {
  name: "test",
  value: "test"
}

// Convert to a string
var json = JSON.stringify(source)

var hash = await Hash('sha-256', json)
var hash2 = await Hash('sha-256', json)

console.log(hash)
console.log(hash2)
// 6287804eacecfa191e5761dfcbfbeb181bf20e52248fb71807f3801beba1a4f7

console.warn(hash === hash2)
// true