index.js

var CryptLib = require('cryptlib'),
	crypt = CryptLib
	plainText = 'This is the text to be encrypted'
	// iv = _crypt.generateRandomIV(16), //16 bytes = 128 bit
    key = crypt.getHashSha256('4E645267556B58703273357538782F413F4428472B4B6250655368566D597133', 32), //32 bytes = 256 bits
    iv = "Vmr-uU5mA2_Zr_13"
    cypherText = "bvtkHfZiTsY0CX6QmHhCboBwXeY9RZVPpdhhdIy6aSwCTVI7YiEGha1aXTIKY4BocGdNIbWkreQHZcTk4WE6F2tQLoVyWERYCGZotbDzxxs="
	// cypherText = _crypt.encrypt(plainText, key, iv),
    originalText = crypt.decrypt(cypherText, key, iv);

    console.log(originalText)


//output
{
    "AppId": "hhhhhh85812",
    "emailId": "[email protected]"
}