Output Validator

A model's JSON checked against its schema, with each problem on its field.

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Category
RAG & Evals
Access
Pro
Source
565 lines · one file
States
6 drawn
Added
12 Oct 2026

The decision inside it

Not valid JSON and not valid against the schema are different

A parse error shows the raw text and never a pretend tree; a schema error shows the parsed tree with the wrong fields marked.

When to use it

Use Output Validator to check a model's structured (JSON) output: valid or not, every problem with its path, the raw and formatted output, and a "request correction" action. validateOutput(raw, schema) builds the result for you.

Installation

How you get it

Paste this into Claude Code, Cursor, Codex or any coding agent. It installs the file and uses it as it is, instead of writing a new one.

Use Liro's Output Validator for this.
Install it: npx shadcn@latest add @liro/output-validator
(the @liro registry is set up in components.json, with LIRO_KEY in .env.local)
Import it from @/components/ui/output-validator.
Do not rewrite or restyle it. Pass my data through its props
and keep its built-in states.

For the full brief with every prop and the mistakes assistants usually make, use Copy prompt above. Pro components install through the @liro registry with your CLI token: see the Namespaced tab.

Usage

components/check-output.tsx
import { OutputValidator, validateOutput, type SchemaField } from "@/components/ui/output-validator";

const schema: SchemaField[] = [
  { path: "customer", type: "string", required: true },
  { path: "amount", type: "number", required: true },
];

export function CheckOutput({ raw, askAgain }: { raw: string; askAgain: () => Promise<void> }) {
  return <OutputValidator result={validateOutput(raw, schema, "Invoice")} schema={schema} onRequestCorrection={askAgain} />;
}

API reference

“Copy prompt” above puts a full brief on your clipboard, install command, dependencies, props, and the mistakes an assistant usually makes with this component.

Props

Read from the component’s own TypeScript interface when the site is built, so this table cannot drift from the file you install.

TypeNotes
resultStructuredOutputResult YesYour own validation result, or `validateOutput(raw, schema)` from this file.
schemaSchemaField[] NoThe fields the output should have, for the schema summary.
onIssueSelect(issue: ValidationIssue) => void No–
onCopyRaw() => void No–
onCopyFormatted() => void No–
onRequestCorrection() => void | Promise<void> NoAdds "Ask for a correction". May return a promise.
isCorrectingboolean NoA correction is being made, if you track it yourself.
correctionStructuredOutputResult NoThe corrected output, once you have it: shown beside the original.

Dependencies

npm packages

clsxframer-motionlucide-reacttailwind-merge

Liro foundations, installed alongside it

liro-themebadgebuttonsegmented-controltabs

States

All of them are drawn by the component. None is left for you to design.

  • Valid
  • Wrong fields
  • Problem selected
  • Not valid JSON
  • Correcting
  • Corrected

Accessibility

  • Keyboard reachable throughout, in visual order
  • Focus trapped in overlays, Escape closes them
  • Focus returns to whatever opened it
  • Live regions announce what changed, not that something did
  • Honours prefers-reduced-motion

Responsive behavior

  • Sizes to its container, not the viewport
  • Usable from 320px up
  • Pointer-based interaction, so trackpad and touch both work
  • No hover-only affordances

Used in a screenAll screens

ScreenPro

Evals

Decide whether a prompt version ships: a pass or block gate, pass rates, model checks and cases.