[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Buffer](https://evolu.dev/docs/api-reference/common/Buffer) › hexToBytes

```ts
function hexToBytes(
  hex: string,
): Uint8Array<ArrayBufferLike> & Uint8Array<ArrayBuffer>;
```

Defined in: node\_modules/@noble/ciphers/utils.d.ts:305

Convert hex string to byte array. Uses built-in function, when available.

## Throws

On wrong argument types. [TypeError](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError)

## Throws

On wrong argument ranges or values. [RangeError](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RangeError)

## Example

Decode lowercase hexadecimal into bytes.

```ts
hexToBytes("cafe0123"); // Uint8Array.from([0xca, 0xfe, 0x01, 0x23])
```