How to Swap AI Models Behind One API Key Without Breaking Node.js Classification Data

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Developers using a single API key to route multiple AI models in Node.js services risk silently corrupting classification data if routing decisions overwrite previously accepted labels. The core principle is to treat every model change as a data migration, preserving taxonomy version, prompt, route, and model provenance alongside each stored result. A dedicated routing service should authenticate the single application credential, select adapters under policy, and keep upstream provider secrets in separate scopes — never exposing them to the calling application. Validators must confirm item identity, taxonomy version, and schema conformance before any result is written to storage, since well-formed JSON output is still untrusted until deterministically checked. The single-key pattern is a security and operations choice suited for teams that can manage credential rotation and audit retention, not a guarantee of semantic equivalence across models.

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