Structured Output with Zod: Type-Safe LLM Responses Across Providers
· 9 min read
You already use Zod to validate API responses. Now it's the contract layer between your app and LLMs. One schema gives you runtime validation, TypeScript inference, AND guaranteed structured output from GPT, Gemini, and Claude. Without it you're calling JSON.parse() on free text and praying the model didn't sneak in a markdown fence or an apologetic preamble.