Recover from invalid model output You let Ax validate fields and retry with specific correction feedback. Your app can still distinguish generation errors, provider failures, and cancellation. typescript academy academy/topics/structured-validation-errors website/content-src/academy/course.mjs academy Recover from invalid model output
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TypeScript @ax-llm/ax
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Unit 3 · Build a reliable AI-powered feature

Recover from invalid model output

You let Ax validate fields and retry with specific correction feedback. Your app can still distinguish generation errors, provider failures, and cancellation.

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Worked example

See the idea in context

try { await program.forward(llm, input); } catch (error) { if (error instanceof AxGenerateError) report(error.details); }
  1. Run the program normally

    Most valid responses return through the usual typed path.

  2. Catch the specific failure

    AxGenerateError identifies a generation or validation failure you can report deliberately.

  3. Preserve useful details

    error.details gives logs and UI a concrete repair target.

Run itIn your own project
npm install @ax-llm/ax

import { ai, ax } from '@ax-llm/ax';

const llm = ai({ name: 'openai', apiKey: process.env.OPENAI_APIKEY! });
const classify = ax('review:string -> sentiment:class "positive, negative, neutral"');

const result = await classify.forward(llm, {
  review: 'Useful and boring in the best way.',
});

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- typescript src/examples/typescript/generation/axgen-openai.ts
Active practice

Show that you can use it

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