cadmium-docs-legacy/protocol-spec/protocol-errors.md

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# Protocol Errors
## Introduction
Mechanism of error processing included into protocol.
Adds into any type ID `:error` postfix.
## Message type identifiers
- `*:error`
## Use cases
*Request*:
```json
{
"id": "abcd",
"type": "incorrectMessageType",
"from": "@juliet@cadmium.im",
"to": "cadmium.im",
"payload": {
"test": "test"
}
}
```
*Response*:
```json
{
"id": "abcd",
"type": "incorrectMessageType:error",
"from": "cadmium.im",
"to": "@juliet@cadmium.im",
"payload": {
"errCode": 0,
"errText": "Incorrect type of message (type isn't implemented in the server)",
"errPayload": {}
}
}
```
## JSON Schema
**Payload**
```typescript
interface ErrorPayload {
/**
* Error code (defined in extensions, may be same per extensions)
*/
errCode: number,
/**
* Explanation of error in human-readable view
*/
errText: string,
/**
* Advanced error information (fields defined in extensions)
*/
errPayload: Map<K,V>
}
```