isval

Composable runtime validators with inference.

Zero dependencies - ~2 KB gzipped - TypeScript - Node + Bun + browser

Install

bun add @knownasrazi/isval
npm install @knownasrazi/isval

Usage

import { string, number, boolean, array, object } from "@knownasrazi/isval";

const schema = object({
  name: string(),
  age: number(),
  tags: array(string()),
});

schema.parse({ name: "razi", age: 30, tags: ["a"] });
schema.safeParse({ name: 1 }); // { ok: false, errors: [...] }

array(number()).parse([1, 2, 3]);
string().safeParse(5); // { ok: false, errors: ["expected string"] }

API

| Export | Description | | --- | --- | | string() | Validator<string> | | number() | Validator<number> (rejects NaN) | | boolean() | Validator<boolean> | | array(el) | Validator<T[]> | | object(schema) | Validator<{ ... }> with inferred output |

Each exposes parse(value): T (throws TypeError) and safeParse(value): { ok, value|errors }.

Development

git clone https://github.com/knownasrazi/isval.git
cd isval
bun install
bun test
bun run build
bun run lint

License

MIT + Razi

isval - validate before you trust.