1v1 Jev

How we reviewed this: we read the code at the pinned commit. Running it needs a game server and a browser client, so nothing here is a hands-on result.

What it does

1v1 Jev, by Emrick Garrett, is a server-authoritative browser shooter where you fight a bot whose decisions come from Jev. The server simulates at 60 Hz and sends snapshots at 20 Hz; the bot asks for a decision on a fixed interval, several times a second.

One request carries several Choices — locomotion, horizontal aim, vertical aim — with criteria written in the voice of the game:

As an aggressive MW2 quickscoper on Rust, pick locomotion. Prefer movement — do NOT camp or stand still.

and for aim: “Hitscan — aim at the enemy’s CURRENT bearing only, never lead a strafe.”

That’s the interesting part of the design: the model picks from a small set of discrete moves, and the server owns physics, hit detection and everything else. When a request fails, a heuristic controller takes over and the match continues — the error is logged, not surfaced as a stall.

What to know

There’s no licence file. And the call pattern is inherent to the genre: a decision several times a second, per bot, for every match anyone plays.

Verdict

A fun demonstration that typed decisions can drive something real-time if you keep the option set small and let code own the simulation. Ask the author for a licence before building on it.

For other real-time demos, see TypeSafe Mario and jev-drone.

See how it compares with other tools in Best Jev tools, tested hands-on.

Review updated Sep 20, 2026. Numbers quoted from the project are its author's own; we don't publish our own measurements of Jev.