# ByteCode

Represents system bytecode stored on-chain, identified by a kind tag and raw bytes.

## Import

```ts
import { SystemByteCode } from 'casper-js-sdk';
```

## Class

### `SystemByteCode`

| Property | Type | Description |
|---|---|---|
| `kind` | `string` | Bytecode type identifier (e.g. `"V1CasperWasm"`) |
| `bytes` | `HexBytes` | Raw bytecode |

#### Constructor

```ts
new SystemByteCode(kind: string, bytes: HexBytes)
```

#### Methods

```ts
byteCode.isEmpty(): boolean
byteCode.isV1CasperWasm(): boolean
byteCode.toString(): string
```

## Usage

```ts
// ByteCode is typically obtained from StoredValue
import { StoredValue } from 'casper-js-sdk';

const storedValue: StoredValue = /* from RPC */;

if (storedValue.byteCode) {
  const bc = storedValue.byteCode;
  console.log('Kind:', bc.kind);
  console.log('Is V1 Wasm:', bc.isV1CasperWasm());
  console.log('Empty:', bc.isEmpty());
}
```

## See Also

- [`StoredValue`](/types/stored-value) - Container that may hold `SystemByteCode`
- [`ContractWasm`](/types/contract-wasm) - WASM bytecode for user contracts