How to Use Jev: Moderation with the Jev API in TypeScript
Blog post from OpenRouter
Jev is TypeSafe’s decision model for converting unstructured input into typed judgments with probabilities, allowing application code rather than the model to determine actions. Using a TypeScript marketplace-moderation example, the guide explains how to separate deterministic checks such as price limits and photo counts from semantic judgments such as prohibited items, off-platform transactions, category fit, contradictory descriptions, and condition accuracy. Developers provide Jev with a focused state object and independent choice, true-or-false “noul,” or ordered score questions, then validate the typed API response from OpenRouter’s Decisions API and apply a pure policy that publishes, holds for review, or rejects listings based on calibrated thresholds. The guide emphasizes writing literal, concrete criteria; including only relevant state and precomputed facts; routing uncertain or failed judgments to human review; and using labeled historical examples to test threshold choices without rerunning model inference. It concludes that this pattern can also support ticket routing, agent-tool controls, and content classification, while generative tasks still require a conventional language model.
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