correct nonce/iv size for AES-GCM mode

I'm using AES in GCM mode to encrypt some data, but I'm using two different languages and libraries for encryption and decryption and they seem to have different vocabularies about what I need.

I'm encrypting with a Python library (Crypto). The encrypt_and_digest method takes a 128 bit key and a message and returns a 128 bit nonce, 128 bit tag, and a ciphertext.

(Encryption code taken from this example)

I'm decrypting with the default Node.js crypto library. That library expects a session key, a tag, and an IV. When I pass the nonce from the Python library as the IV, it gives me an “invalid iv size” error. Examples of the Node library seem to use a 12-character string as an IV.

My decryption code looks like this (taken from here):

var decipher = crypto.createDecipheriv(algorithm, password, nonce)
decipher.setAuthTag(encrypted.tag);
var dec = decipher.update(encrypted.content, 'hex', 'utf8')

What is the difference between IV and nonce for this scheme? How should I resolve this? Thanks!

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