Replayable Node.js Content Moderation Contracts for JSON Chat Completions
Short answer: Treat content moderation as a typed authorization boundary: a Node.js upload should remain pending until a chat-completions-compatible adapter returns a locally validated JSON Schema result for the text and image together, while invalid, late, or unknown results go to review rather than silently becoming approval. This design keeps the model's job narrow. It classifies supplied…
Replayable Node.js content moderation contracts for JSON chat completions emphasize treating moderation as a typed authorization boundary. This approach maintains a narrow focus for the model by having it classify supplied content, while application policy ultimately decides on release. The flow consists of Node.js accepting and normalizing an upload, an internal Python gate building a multimodal request, an adapter performing the configured completion, local code validating the response, and the application committing allow, block, or review before persistence or publication.
The Node.js handler handles authentication, request limits, file inspection, and lifecycle state, while the moderation component receives an opaque item ID, normalized text, and an approved image reference. It starts in pending state and only transitions to allow upon successful validation. This design ensures that a slow classifier cannot compromise the database write or background publishing process.
Text and image should enter the decision envelope simultaneously, as their combined meaning is crucial. A harmless caption can alter the interpretation of an image, and vice versa. File signatures, decode limits, malware checks, and rate limits should still occur before inference. The three-way result of review should not be confused with allow; instead, it marks uncertainty, policy-version mismatch, malformed structured data, expired image references, or deadline issues.
A product lacking a human queue can reject the upload and allow a retry, but it must maintain distinction internally for operators to understand the reason behind the non-progression. The Python service is merely an implementation choice, not a protocol requirement. It works well within a notebook-to-production workflow since the same pure policy functions can run in an eval notebook and behind an internal endpoint.
A team can implement the contract entirely in Node.js; the critical artifact is the versioned decision object, not the language boundary.
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