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# NWProtocolFramer

A customizable network protocol for defining application message parsers.

```
class NWProtocolFramer
```

## Topics

### Implementing Framer Protocols

[`NWProtocolFramerImplementation`](/documentation/Network/NWProtocolFramerImplementation)

A protocol to which your classes can conform in order to implement a custom framing protocol.

[`NWProtocolFramer.Instance`](/documentation/Network/NWProtocolFramer/Instance)

An object that represents a single instance of your custom protocol running in a connection.

### Using Framers with Connections

[`NWProtocolFramer.Definition`](/documentation/Network/NWProtocolFramer/Definition)

A custom protocol definition you use to associate messages with protocol options.

[`NWProtocolFramer.Options`](/documentation/Network/NWProtocolFramer/Options)

A container you use to add your custom protocol to a connection’s protocol stack.

[`NWProtocolFramer.Message`](/documentation/Network/NWProtocolFramer/Message)

A message for a custom protocol, in which you can store arbitrary key-value pairs.


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