How to Build a Typed Content Moderation Layer in Node.js Using JSON Schema

A software architecture guide outlines a content moderation pattern for Node.js applications where uploaded content stays in a pending state until a chat-completions-compatible adapter returns a locally validated JSON Schema result. The design separates responsibilities clearly: Node.js handles authentication, rate limits, and file inspection, while a moderation component receives only an item ID, normalized text, and an approved image reference. Text and image are evaluated together in a single decision envelope, since captions and visuals can alter each other's meaning. The system enforces a strict three-way outcome — allow, block, or review — where 'review' explicitly captures uncertainty, policy mismatches, or malformed responses rather than defaulting to approval. A runnable Python example is provided to illustrate the contract, though the pattern can be implemented in any language as long as the versioned decision object is preserved.