One grounded Jev/Playwright core: typed SDK, persistent CLI, and MCP server with native browser operations and deterministic assertions.
Parallel semantic decisions. Deterministic Playwright effects. Explicit verification provenance.
Jev Browser combines native Playwright operations with Jev decisions over actual page elements. Use it instead of a Playwright MCP/CLI setup for browser automation, and instead of Stagehand for DOM-grounded act, observe, structured extract, and bounded agent workflows.
Native operations and assertions run without an AI key. Natural-language operations use the official TypeSafe SDK against hosted Jev by default, or any compatible System One endpoint configured with baseURL / JEVBASEURL. A custom endpoint does not require a Jev API key. The decision backend chooses supplied candidates; it does not generate executable JavaScript or selectors. The project is Apache-2.0 licensed; hosted services and model weights are not included.
日本語 · Migration guide · API · Semantic verification · Security · Verification
Node.js 22.15 or newer. Download the package from GitHub Releases, then install it into your project:
The release tarball includes compiled JavaScript, declarations, the DOM bundle, documentation, and examples. There is no postinstall browser download and no requirement for a global browser daemon. The package is distributed on GitHub Releases; a registry publication is not implied.
Use existing Playwright Locators, not another selector engine
actual: { locator, property: 'text' 'value' 'checked' 'attribute' } also works directly in assertSemantic / assertSemanticBatch. Exact values need no model configuration. Ambiguous targets, other Pages and caller-scope escapes are rej
From the project README.
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