Node.js guide: using JSON Schema to keep structured summarization portable

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The article argues that the portable unit in structured summarization is the JSON Schema contract, not the model request, so it should live in application code. Using an invoice extraction example, it recommends a minimal set of fields such as supplier, invoice number, currency, total, issue date, line items, and review reasons. Missing values are represented as null rather than zero, and checks like reconciliation and payability are handled by the application after parsing. The author describes an adapter boundary that returns untrusted strings instead of casting them to typed objects, which keeps endpoint changes separate from invoice rules. Three adapter styles are compared: SDK, REST, and self-hosted, each with different trade-offs.

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