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Browser automation with Jev (TypeSafe) as decision model
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- Last pushed
- Updated Oct 2026
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CommunityJev Demos & Experiments
Jev Browse — 0x7067
Browser agent that takes a goal and start URL, reads each page as a numbered control table, and has Jev pick one operation and target per step until done or stuck.
- Stars
- 4
- Language
- JavaScript
- License
- MIT
- Published by
- Community
- Author
- 0x7067
- Last verified
- Oct 2026
About this project
You give jev-browse a goal and a start URL, and it drives Chrome until the goal is done or it's stuck. On each step, TypeSafe's Jev reads a numbered table of what's on the page and picks one operation and one row. It never writes selectors, coordinates, or code, so every target it can name exists. A small LLM only runs for TYPETEXT, to write the text. Here it searches Google Flights for one-way flights from Zürich to London, at real speed. The bar at the bottom captions each action as it runs.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
- Languages
- JavaScript
Highlights
- Jev never writes selectors, coordinates, or code, so every named target already exists; a small LLM only writes TYPE_TEXT.
- Ships as a committed esbuild bundle, so Pi, Claude Code, Codex, OpenCode, MCP, and CLI run without building.
- Documented Google Flights run finished in 14,586 ms and 11 actions counted from the first page observation.
- Completion claims are rechecked against fresh observations, with optional regex expectations and an answer reviewer.
Watch out
Page text goes to outside model APIs and start URLs must be http or https; completion judgments can be wrong, so verify outcomes that matter. 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.
Selector scripts break when markup shifts. Here a fresh control table is built every step and Jev names an existing row plus one operation, with references to the real DOM nodes and frame offsets handled for clicks.
Nothing gets built. Every harness, from Pi and Claude Code to Codex, OpenCode, MCP or the CLI, runs bundled/, a committed esbuild bundle with the SDK inlined, so the real requirements are Node 22 or later and Chrome. JEV_PROVIDER selects typesafe or openrouter, defaulting to openrouter when its key is set; TYPESAFE_API_KEY or OPENROUTER_API_KEY covers the decision model, and TEXT_MODEL_API_KEY is only needed for TYPE_TEXT steps and written answers. A file:// start URL is refused because page text goes to outside model APIs.
It exits blocked after the step, call, and no-progress fuses trip. On a visible CAPTCHA it gets two actions, then stops with blocked/verification_required unless you passed --stop-at-challenge.
Supply --expect regexes for URL, text, state, or frames and all must match, which replaces model judgment. Without it a separate review checks fresh observations before DONE counts.
CLICK, DOUBLE_CLICK, TYPE_TEXT, SELECT, SCROLL_UP, SCROLL_DOWN, WAIT, DONE, BLOCKED, HOVER, CONTEXT_CLICK, DRAG, GO_BACK, GO_FORWARD, and PRESS_* for Enter, Tab, Escape, Backspace, Delete, the arrows, Home, End, PageUp, PageDown and Space. Key presses are real key events, so Enter-to-submit works. One Jev request answers the operation and every target question together, so a decision costs one round trip.
No. A snapshot collects visible controls, names, values and page text in one browser call and keeps references to the real DOM nodes. It reads open shadow roots and same-origin iframes with frame offsets, indexes password, date, time, range and file inputs a plain role mapping misses, types dates key by key, and sets files through DOM.setFileInputFiles without clicking. Heuristics only fill gaps and each is listed with its reason in docs/standards.md.
jev-browse --url ... --goal ..., with --engine cdp or agent-browser, --headed, --max-steps 60 by default, --expect, --stop-at-challenge and --trace. Step events stream to stderr as JSONL and stdout carries only the final result JSON; exit 0 is done, 2 is blocked, 1 is an error. A run also stops after three non-wait actions in a row that change nothing, or 10 seconds without progress.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
3GitHub stars
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