> ## Documentation Index
> Fetch the complete documentation index at: https://voltaire.tevm.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# Bytecode.from

> Universal constructor for creating bytecode from hex strings or Uint8Array

<Card title="Try it Live" icon="play" href="https://playground.tevm.sh?example=primitives/bytecode.ts">
  Run Bytecode examples in the interactive playground
</Card>

<Tabs />

## BytecodeLike Type

`BytecodeLike` is a union type accepting any input that can be coerced to bytecode:

```typescript theme={null}
type BytecodeLike =
  | Uint8Array
  | BrandedBytecode
  | Bytecode
  | Hex
  | string
```

### Accepted Types

**Uint8Array** - Raw byte arrays:

```typescript theme={null}
const bytes = new Uint8Array([0x60, 0x01])
const code = Bytecode(bytes)
```

**BrandedBytecode** - Branded bytecode (passed through):

```typescript theme={null}
const branded = Bytecode("0x6001")
const code = Bytecode(branded)  // No conversion
```

**Hex String** - With or without `0x` prefix:

```typescript theme={null}
const code1 = Bytecode("0x6001")
const code2 = Bytecode("6001")  // Also valid
```

<Warning title="String Interpretation">
  Strings without `0x` prefix may be treated as UTF-8 text, not hex. Always use `0x` prefix for hex strings.
</Warning>

### Usage in Function Signatures

Use `BytecodeLike` for flexible function parameters:

```typescript theme={null}
function analyzeBytecode(input: BytecodeLike): Analysis {
  const code = Bytecode(input)
  return code.analyze()
}

// All valid calls
analyzeBytecode("0x6001")
analyzeBytecode(new Uint8Array([0x60, 0x01]))
analyzeBytecode(Bytecode("0x6001"))
```

### Performance

**No conversion overhead** for `Uint8Array`, `BrandedBytecode`, and `Bytecode` (zero-copy).

**Conversion required** for strings (parses hex and allocates new Uint8Array).

For performance-critical code, prefer passing `Uint8Array` or `BrandedBytecode` directly.

## See Also

* [fromHex](/primitives/bytecode/fromhex) - Parse hex string directly
* [fromUint8Array](/primitives/bytecode/fromuint8array) - Create from Uint8Array directly