How can I decrypt a HMAC?

Question

I can make an HMAC using the following:

var encrypt = crypto.createHmac(\"SHA256\", secret).update(string).digest(\'base64\');

I am trying

Answer 1

Clean-up of code for a Minimalist View and removal of clutter: note: IIFE runnable in node repl "As Is"

!function(){

const crypto = require("crypto");

// key 
var key = crypto.createHash("sha256").digest();


 // this is the string we want to encrypt/decrypt
 var secret = "ermagherd";

 console.log("Initial: %s", secret);

// create a aes256 cipher based on our password
var cipher = crypto.createCipher("aes-256-cbc", key);

// update the cipher with our secret string
cipher.update(secret);

// save the encryption 
var encrypted = cipher.final();

console.log("Encrypted: %s", encrypted);

// create a aes267 decipher based on our password
 var decipher = crypto.createDecipher("aes-256-cbc", key);

// update the decipher with our encrypted string
decipher.update(encrypted);

console.log("Decrypted: %s", decipher.final()); //default is utf8 encoding   final("utf8") not needed for default

}()

/*  REPL Output

            Initial: ermagherd
    Encrypted: T)��l��Ʀ��,�'
    Decrypted: ermagherd
    true
*/