# DEFAULT_CALLBACK_METADATA

**Kind:** Constant

**Source:** [`packages/websockets/context/ws-metadata-constants.ts`](https://github.com/nestjs/nest/blob/master/packages/websockets/context/ws-metadata-constants.ts#L3)

**Part of:** [Websockets](subsystem-packages-websockets)

## Definition

```ts
{
  [`${WsParamtype.ACK}:2`]: { index: 2, data: undefined, pipes: [] },
  [`${WsParamtype.PAYLOAD}:1`]: { index: 1, data: undefined, pipes: [] },
  [`${WsParamtype.SOCKET}:0`]: { index: 0, data: undefined, pipes: [] },
}
```

## Value

```ts
{
  [`${WsParamtype.ACK}:2`]: { index: 2, data: undefined, pipes: [] },
  [`${WsParamtype.PAYLOAD}:1`]: { index: 1, data: undefined, pipes: [] },
  [`${WsParamtype.SOCKET}:0`]: { index: 0, data: undefined, pipes: [] },
}
```