How to supply the GCM authentication tag to the OpenSSL command line tools?
Here's a NodeJS AES-GCM module. Or alternatively, you can use the OpenSSL library to write your own GCM decryption code, here's a quick tutorial.

The OpenSSL utility has historically not supported GCM encryption/decryption via command line parameters, likely due to the auth tag issue. I don't think that anything has changed since then, so you may want to take another approach.