Generate Object With Structured Output

Sometimes you need the language model to return data in a specific format rather than free-form text. This example shows how to use Zod schemas to get structured JSON output from the model, making it easier to work with the response in your application.

import { Mastra } from '@mastra/core';
import { z } from 'zod';
 
const mastra = new Mastra();
 
const llm = mastra.LLM({
  provider: 'OPEN_AI',
  name: 'gpt-4o',
});
 
const recipeSchema = z.object({
  recipe: z.object({
    name: z.string(),
    ingredients: z.array(
      z.object({
        name: z.string(),
        amount: z.string(),
      }),
    ),
    steps: z.array(z.string()),
  }),
});
 
const result = await llm.generate('Generate a egusi recipe.', {
  output: recipeSchema,
});
 
console.log(JSON.stringify(result.object.recipe, null, 2));

View Example on GitHub

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