Websocket Decryption

i need a small script/code that can decrypt incoming encrypted websocket messages (from a single url) through my laptop realtime. I am using wireshark for this. I can decrypt https data, but i couldn't decrypt websocket data. It is acceptable for me if you can do this only with wireshark or a sample software, or if you can write a small extension for wireshark, or if you can write a small software which works with wireshark. The language used for this is not important, you can use c, c++, c#, lua, python, js, or whatever you want. I will say the desired url for websocket decryption at private chat. Wireshark, Lua