@fieldtest/core

Validate Markdown documents and data with any Standard Schema library (zod, valibot, arktype, ...).

npm install @fieldtest/core zod

import { check, checkDocument, formatIssues, parseDocument } from "@fieldtest/core";
import { z } from "zod";

// A document: front matter as data, body as an outline
const doc = parseDocument(text, { path: "posts/hello.md" });
const result = await checkDocument(doc, {
  frontmatter: z.object({ title: z.string(), date: z.string().date() }),
  outline: z.object({ lines: z.number().max(500) }),
});
if (!result.ok) console.error(formatIssues(result.issues));

// Any data
const r = await check(schema, record); // { ok: true, value } | { ok: false, issues }

• Front matter is parsed as YAML 1.2 data and never executed.
• Parsing never throws: invalid YAML is an issue with the file line.
• One dependency: yaml. Only validating data? import { check, formatIssues } from "@fieldtest/core/check" skips it, which matters for browser bundles.

API: docs/reference/api.md. Upgrading from 1.x: MIGRATING.md.

MIT