What do browser cheats write on?

Question

Game development

In what language is it optimal and convenient to write cheats for browser games (like VK games)?

Answer 1

On tcpdump

Answer 2

Fiddler , for example.
Wireshark does not seem to allow changing traffic.
And injection by means of JS does not work well if the game uses anonymous functions. The whole game engine with all the data can be wrapped in an anonymous function - and fuck you get to them.