blog: stream structured output end-to-end with useChat({outputSchema})#923
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KevinVandy merged 2 commits intoMay 14, 2026
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Announces the TanStack AI release that folds streaming structured output into useChat: pass a Zod schema, get a typed `partial` and `final` back. Covers the old glue (manual parsePartialJSON + onChunk + casts), the new hook shape, the type-system changes (StructuredOutputStream<T> + tagged variants for ApprovalRequestedEvent / ToolInputAvailableEvent), provider coverage (OpenAI / OpenRouter / Grok / Groq / Ollama), and framework parity across React / Vue / Solid / Svelte.
KevinVandy
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May 14, 2026
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Announces the TanStack AI release that folds streaming structured output into
useChat: pass a Zod schema, get a typedpartialandfinalback. Companion blog post for TanStack/ai#527.What's in the post
onChunk+useState+parsePartialJSON+ a manual cast.const { partial, final } = useChat({ outputSchema: PersonSchema }).StructuredOutputStream<T>with proper discriminated narrowing, taggedApprovalRequestedEventandToolInputAvailableEventvariants.Files
src/blog/streaming-structured-output.md— the post (~960 words).public/blog-assets/streaming-structured-output/header.png— cover image.Verified
oxfmt(pre-commit) ran clean on the post.tsc+oxlint(pre-commit) found no new issues. The lint warnings printed in the hook are pre-existing in unrelated files.