valext

Minimal helper for extracting typed, validated values from Valibot schemas.

Cloudflare Workers, Hono, and other runtime environments benefit from explicit contracts and clear validation flows. But valibot.safeParse() gives you nested boilerplate, and parsing logic often gets duplicated or abstracted too deeply.

valext embraces a simple idea:

✨ Extract values with structure and intent, without hiding what matters.

  const result = extract(schema).from(unknownValue, issues => console.warn(issues))

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Installation

  pnpm add @gambonny/valext

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Why valext?

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Example in Hono

import { validator } from 'hono/validator'
import { extract } from '@gambonny/valext'
import { signupSchema } from './schemas'

app.post(
  '/signup',
  validator('json', async (body, c) => {
    const { success, output } = extract(signupSchema).from(body, issues =>
      c.var.logger.warn('validation failed', { issues }),
    )

    return success ? output : c.text('Invalid input')
  }),
)

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API

extract(schema).from(input, onError?)

Returns:

{
  success: true;
  output: T;
  issues: undefined;
}

or:

{
  success: false;
  output: undefined;
  issues: ValibotFlattenedIssues;
}

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extract(schema).safe(input, onError?)

Exactly like valibot.safeParse(), but lets you pass a callback for flattened errors.

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extract(schema).parse(input)

Exactly like valibot.parse(). Will throw if input is invalid.

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Design Notes

• ✅ valext uses valibot.safeParse() under the hood.
• ✅ Errors are flattened with valibot.flatten().nested for easy rendering/logging.
• ✅ If you need raw nested issues, just use valibot.safeParse() directly — you’re not locked in.

Reminder: valext is not an abstraction layer — it’s a tool for making your intent clear at the point of use.

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License

MIT