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Built with Jev: how Fake / Real (fake-real.live) uses TypeSafe Jev to check claims against cited evidence.
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Fake / Real (made with Jev)
The production code behind fake-real.live, published so its Jev integration can be read and run: Firecrawl fetches a page, Gemini extracts up to five atomic claims, Tavily searches, and Jev decides which sources to read and whether each claim is supported, contradicted or unknown.
- Stars
- 1
- Language
- JavaScript
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- dansidanutz
- Last verified
- Oct 2026
- Languages
- JavaScript
- Platforms
- API
- Capabilities
- Open sourceRequires API key
Highlights
- The full Fake / Real application is closed source; this repo publishes the production Jev client and claim check so the integration can be read and run.
- Jev decides which Tavily results are worth reading (batched noul questions) and labels each claim supported, contradicted or unknown (one choice each).
- Evidence policy: 0.8 counts as evidence, the TypeSafe citation-check cookbook default; 0.7 to 0.8 is shown as likely and never counted.
- The client pins jev-1.13.0, retries only on 429, 503, 529 or network errors within the caller's time budget, and scrubs credentials from errors.
- Node 20 or newer and no dependencies: TYPESAFE_API_KEY=your-key node examples/check-claim.mjs sends one sample claim.
Quickstart
bash
TYPESAFE_API_KEY=your-key node examples/check-claim.mjsWatch out
Grounded on the full repo README and GitHub metadata read on 2026-10-15. The live site is closed source, so this entry covers only the published client, claim check and evidence policy; the walkthrough video's live scan ended without a verdict (its credit was returned), and the coffee reports in it are labelled saved examples with their original analysis times.
Questions about this entry
Short answers drawn from the linked project or page.
The production Jev client and claim check from Fake / Real, an English and Romanian evidence-review site, published so the integration can be read and run on its own. The full application is closed source; here you get lib/jev-client.js, lib/claim-check.js, lib/evidence-policy.js, docs and one runnable example.
Firecrawl retrieves the submitted page, Gemini extracts at most five short atomic claims, and Tavily searches for outside sources. Jev then decides which search results are relevant enough to read, labels each claim against the cited excerpts, picks the article's main assertion and grades evidence-quality criteria.
Deterministic code, not Jev. A REAL or FAKE stamp requires a confidently identified main claim backed by pages that were actually read. Jev never generates text here, and its confidence is treated as a signal, not as proof that a claim is true; Gemini writes the explanations.
A relation counts as evidence at 0.8 or above, the TypeSafe citation-check cookbook default recorded in lib/evidence-policy.js. Scores from 0.7 to 0.8 are shown as likely but never counted, so a marginal match cannot drive the public result.
You need Node 20 or newer and a TypeSafe API key; there are no dependencies to install. Run TYPESAFE_API_KEY=your-key node examples/check-claim.mjs and it sends one sample claim to Jev and prints the result. The key is read from the environment only and never committed.
lib/jev-client.js enforces size limits, retries only on 429, 503, 529 or network errors within the caller's time budget, scrubs credentials from error messages and validates Choice and Noul answers before the rest of the pipeline sees them.
A 49-second, 720p walkthrough with English narration: link entry, the live scan timer, Jev's evidence-checking role, a saved REAL example, a saved FAKE example and the linked sources. The live documentation scan shown in it ended without a verdict, and its credit was returned.
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