Errors and error parameters, error response message

ErrorModel.json

[
  
    {
    "key": "fieldRequired",
    "message": "{{fieldName}} is required",
    "parameters": [
      {
        "name": "fieldName",
        "value": ""
      }
    ]
  },
  {
    "key": "fieldEqual",
    "message": "{{fieldName}} should match {{referenceValue}}",
    "parameters": [
      {
        "name": "fieldName",
        "value": ""
      },
      {
        "name": "referenceValue",
        "value": ""
      }
    ]
  }
]

ErrorResponse.json

{
  "valid": false,
  "errors": [
    {
      "key": "fieldRequired",
      "parameters": {
        "fieldName": "TheFirstField"
      }
    },
    {
      "key": "fieldRequired",
      "parameters": {
        "fieldName": "TheSecondField"
      }
    }
  ]
}