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HTML

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>decrypt with Javascript</title>
	<script src='https://cdnjs.cloudflare.com/ajax/libs/fetch/2.0.2/fetch.min.js'></script>
	<script src='https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/core-min.js'></script>
	<script src='https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/cipher-core-min.js'></script>
	<script src='https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/aes-min.js'></script>
	<script src='https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/enc-base64-min.js'></script>
</head>
<body>

<script>
const key = '9ecd1c41431e6624';
const iv = '83ca97ad7a04c92b';
fetch('https://www.surveycake.com/webhook/v0/8aa7P/d8cc4036f4250ab5fb20e02eba994458')
	.then((res) => res.text())
	.then((dat) => {
		const cipherParams = CryptoJS.lib.CipherParams.create({
			ciphertext: CryptoJS.enc.Base64.parse(dat),
		});
		const decrypted = CryptoJS.AES.decrypt(
			cipherParams,
			CryptoJS.enc.Utf8.parse(key),
			{
				iv: CryptoJS.enc.Utf8.parse(iv),
			}
		);
   
   let result = JSON.parse( decrypted.toString(CryptoJS.enc.Utf8));
    
    document.write('完成，請看 F12 -> Console。');
		console.log(result);
	});
</script>

</body>
</html>