---
title: NSUndefinedKeyException userInfo Keys
framework: objectivec
role: collectionGroup
path: objectivec/nsundefinedkeyexception-userinfo-keys
---

# NSUndefinedKeyException userInfo Keys

These constants are keys into an NSUndefinedKeyException userInfo dictionary

## Overview

Overview For additional information see Key Value Coding Exception Names.

## Topics

### Constants

- [NSTargetObjectUserInfoKey](objectivec/nstargetobjectuserinfokey.md)
- [NSUnknownUserInfoKey](objectivec/nsunknownuserinfokey.md)

## See Also

### Constants

- [Key Value Coding Exception Names](objectivec/key-value-coding-exception-names.md)
- [NSKeyValueValidationError](foundation/nskeyvaluevalidationerror-swift.var.md)