Gardien

Type-safe runtime schema validation and parsing

Node Package 📦

Features

Current features

100% TypeScript and ESM
No external dependencies
Rust-like patterns
Fully type-safe
Unit-tested
Zod-like syntax

Usage

Parsing a number

const value = Guard.asOrThrow(z.numberable().nonNegative(), "0x123")

Validating a complex record

import { Guard, z } from "@hazae41/gardien"

const RpcRequestGuard = z.record({
  jsonrpc: z.strong("2.0"),
  id: z.union([z.strong(null), z.number(), z.string()]),
  method: z.string(),
  params: z.optional(z.unknown())
} as const)

function onMessage(message: string) {
  const request = Guard.asOrThrow(RpcRequestGuard, JSON.parse(message) as unknown)

  if (request.method === "example")
    return void example(request)
  
  throw new Error("Unknown method")
}