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Vercel AI SDK Middleware vs Genkit Middleware: A Hands-On Comparison

calendar_today May 15, 2026 person Xavier Portilla Edo domain dzone

Two of the most popular Gen AI frameworks in JavaScript/TypeScript, Vercel AI SDK and Genkit , both ship a middleware system to extend their model calls with cross-cutting behavior: logging, caching, RAG, retries, fallbacks, guardrails, tool approval, etc. On the surface they look very similar. In practice, they sit at different abstraction levels and embody different philosophies.

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