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An F1 racing game where TypeSafe's Jev picks the racing line and the pedals, and learns each corner's limit between laps
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- Last pushed
- Updated Sep 2026
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CommunityJev Demos & Experiments
Jev Grand Prix
Browser F1 game where Jev drives one car live from telemetry phrased as race-engineer words, choosing track aim, pedals, and a trouble probability while you can race it yourself.
- Stars
- 7
- Language
- JavaScript
- License
- MIT
- Published by
- Community
- Author
- enoyola
- Last verified
- Oct 2026
About this project
A racing game where TypeSafe's Jev drives an F1 car live, and you can race it. You need uv and a TypeSafe API key from console.typesafe.ai (Jev is in early access, so you may have to join the waitlist first). uv installs Python and the dependencies itself. Then open and press Start race. Tick Race Jev yourself to drive your own car with the arrow keys (C switches the camera). The default 8 laps lets you watch the race engineer find the limit of every corner.
Quoted from the project's README. Read the full README.
Used inJev for Software & DevTools
- Languages
- JavaScript
Highlights
- Sends telemetry-as-words and asks three questions in one request each cycle.
- Jev picks racing line and pedals; code handles steering and braking rates.
- Code-only timing loop walks per-corner target speeds from 80% to 130%.
- You can race the Jev car with arrows, camera key, and configurable laps.
Watch out
The race pauses when the tab hides and every race stops at 10 minutes, with the key kept in server-side .env so the browser never sees it. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
Direct wheel control weaved and left the track because a 0.27 s answer covers about 19 m at speed. Now Jev picks the line and pedals several times per second while code steers toward that line 120 times per second with brake-by-wire to corner speed.
Code times each corner zone per lap, compares options itself, then asks one faster, same, or slower question per corner. Each corner walks a ladder from 80% to 130% starting at 100%, with the panel showing history and next-lap plans.
Need uv and a TypeSafe key in .env, then uv run server.py and open port 8765. Press Start race, tick the race-Jev option to drive with arrows and C for camera, with 8 laps as the default.
Three questions in one request: track aim across far left to far right, pedal across full throttle to hard brake, and a noul trouble probability shown as a meter. Code executes the returned line plus pedals.
About 3.5 decisions a second at roughly 0.27 s each, so around $0.009 per lap and about $0.05 for a five-lap race, with the measured eight-lap run at $0.06 and a running total shown in the panel. The race pauses automatically when the tab is hidden and every race stops at 10 minutes. The key stays in .env on the server, so the browser never sees it.
Three things from the 8-lap run. Telling Jev about brief slides made it back off too much, so sector time is the honest signal instead. Overlapping option descriptions, such as normal meaning the fastest so far, which is always true after lap one, made it stick to one answer, and TypeSafe lists contradictory criteria as a known weak spot. And a level named maximum at 118 percent was read literally as the top, so naming levels by percentage fixed it.
Open http://localhost:8765/?film=1&laps=3&auto=1: it hides the controls, enlarges the readouts and starts the race by itself. Make the window tall and narrow, around 430 by 930, and the layout stacks into a phone-shaped view with the track on top and Jev's decisions underneath. To change circuit, trace a real layout into CONTROL in web/game.js; server.py holds the numbers-to-words step and the API call.
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