Use generateObject to get structured data from an LLM with the AI SDK

LLMs often return free-form text, which can be hard to parse.
With the AI SDK, you can use generateObject to directly enforce a typed JSON schema — no more brittle regex or string parsing.

import { openai } from '@ai-sdk/openai';
import { generateObject } from 'ai';
import { z } from 'zod';

const result = await generateObject({
  model: openai('gpt-4.1'),
  schema: z.object({
    name: z.string(),
    age: z.number(),
  }), 
  prompt: "Extract the person's name and age: John is 42 years old.",
});

console.log(result.object);
// → { name: "John", age: 42 }

Why it’s great:

• Enforces strict structure with Zod
• No messy post-processing
• Safer integration with TypeScript

Use generateObject whenever you want predictable, typed data from an LLM.

Learn more about generateObject in the AI SDK documentation.