Will someone please tell me how to counter Jax on twisted treeline, because right now he just seems like the most op piece of **** ever created. Not ranting, but I would extremely appreciate it if someone would tell me how to counter him. Thanks.

1 word
/ff

only way to counter him

Gank him and/or buy Frozen heart and Randuins cut his damage down considerably as well. Jax gets strong with farm so keep pressure on him with ganks from the back. Even if it just sends him back it's a huge win for your team.

Teemo can give jax a really hard time if he is played well, blind keeps most of his burst from landing, too fast, and shroom wards. A good teemo will keep jax from ever farming. That being said, play ranked and ban him.

Teemp, Malphite, Nunu, Gragas, Singed.

Attack speed slows for days or people that can out run him.

Edit: lee Sin and Darius too

thank you very much guys, i appreciate the help. I will try some of these

you beat him by not playing TT

Its just the judgement of one's actions. Try playing Jax, the best way to understand how to counter a champion is to learn its limitations.