Gemini Structured Output With Zod in Next.js
Describe the JSON once in Zod, send z.toJSONSchema() to Gemini as responseJsonSchema, then validate the reply with safeParse and retry once with the errors.
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Coding tips and build notes by Mahir Faysal, a student web developer in Bangladesh: tested Python, HTML, CSS, JavaScript and PHP tutorials, plus notes from my Next.js and Gemini projects. Sample posts are marked and drafts stay in the admin area.
Describe the JSON once in Zod, send z.toJSONSchema() to Gemini as responseJsonSchema, then validate the reply with safeParse and retry once with the errors.
How I built Quizwright so the Gemini API key never reaches the browser: one Next.js server route, a server-only import, Zod checks and a single retry.
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