---
title: ignoreUnknownCharacters
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsdata/base64decodingoptions/ignoreunknowncharacters
---

# ignoreUnknownCharacters

Modify the decoding algorithm so that it ignores unknown non-Base-64 bytes, including line ending characters.

## Declaration

```swift
static var ignoreUnknownCharacters: NSData.Base64DecodingOptions { get }
```