Wondering if there is something such as
https://live.blockcypher.com/btc/decodetx/ that you can download and run offline.
From what I understand it should be possible to do this offline since it doesn't need to fetch anything from the web and I only need to decode the transaction and not actually broadcast it yet.
Basically upgrading my wallet software and want some testing to be done offline. Let me know if there is something such as this on Github or if its possible to use Bitcoin core to perform this function.