Validation

Choose a tab to use the same library in the snippet and live demo. See the validation guide for installation.

Zod

import { Http, envelope } from "fetchzen";
import { z } from "zod";

const schema = z.object({ name: z.string().trim() });
const api = Http.create(`${location.origin}/api/examples/`, {
  cache: false, secure: false, preset: envelope,
});
const result = await api.get("echo", { params: { name: "Ada" }, schema });
console.log(result.payload.name);

Try this requestSchema validation

Request parameters

Name Require a number instead of a name (validation failure)

Only Run sends a request to this site's demo API. Use synthetic data only; do not send secrets or personal files. Uploads are counted, not stored.

Run Cancel

Ready. No request sent.

Result

Choose Run to see the response.

Event log

No events yet.

Valibot

import { Http, envelope } from "fetchzen";
import * as v from "valibot";

const schema = v.object({ name: v.pipe(v.string(), v.trim()) });
const api = Http.create(`${location.origin}/api/examples/`, {
  cache: false, secure: false, preset: envelope,
});
const result = await api.get("echo", { params: { name: "Ada" }, schema });
console.log(result.payload.name);

Try this requestSchema validation

Request parameters

Name Require a number instead of a name (validation failure)

Only Run sends a request to this site's demo API. Use synthetic data only; do not send secrets or personal files. Uploads are counted, not stored.

Run Cancel

Ready. No request sent.

Result

Choose Run to see the response.

Event log

No events yet.

What to notice

Try a name with surrounding spaces: the inferred payload contains the trimmed name, without the echo response’s extra fields. The numeric-name checkbox intentionally requires a number instead of a string to produce ERR_SCHEMA. The demo calls this site’s bounded echo endpoint; use your own base URL in an application.

Next: transforms or safe errors.