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

HMAC is a MAC/keyed hash, not a cipher. It's not designed to be decrypted. If you want to encrypt something, use a cipher, like AES, preferably in an authenticated mode like AES-GCM.

The only way to "decrypt" is guessing the whole input and then comparing the output.