# Reference: `sushi` Validate

The root validation module exposes promise result guards and shared zod schema helpers.

## Exports

| Export | Purpose |
|---|---|
| `isPromiseFulfilled` | Type guard for fulfilled `Promise.allSettled` results. |
| `isPromiseRejected` | Type guard for rejected `Promise.allSettled` results. |
| `hex` | Zod schema factory for `0x`-prefixed hex strings. |
| `sz` | Shared schema namespace. Includes `sz.hex` and `sz.evm`. |

## Hex schema

Use `hex()` or `sz.hex()` to validate `0x`-prefixed hex strings. Parsed values are lowercased and typed as viem `Hex`.

```ts twoslash
import { hex, sz } from 'sushi'

const data = hex().parse('0xABCDEF')
const same = sz.hex().parse('0xABCDEF')

data // '0xabcdef'
same // '0xabcdef'
```

Invalid values throw a zod error.

```ts
import { hex } from 'sushi'

hex().parse('abcdef') // throws: missing 0x prefix
```

## EVM schemas

`sz.evm` exposes the EVM schema helpers from `sushi/evm` through the root namespace.

```ts twoslash
import { sz } from 'sushi'

const address = sz.evm.address().parse(
  '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
)
```

Use `sushi/evm` directly when you only need EVM validation helpers. Use root `sz` when you are already working from the generic `sushi` entrypoint.

## Promise result guards

Use the promise settled-result guards when working with `Promise.allSettled`.

```ts twoslash
import { isPromiseFulfilled, isPromiseRejected } from 'sushi'

const results = await Promise.allSettled([
  Promise.resolve(1),
  Promise.reject(new Error('failed')),
])

const values = results.filter(isPromiseFulfilled).map((result) => result.value)
const errors = results.filter(isPromiseRejected).map((result) => result.reason)
```