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## Resource: About Errors

## Article: About Errors

## Article Link: https://dev.wix.com/docs/sdk/articles/work-with-the-sdk/about-errors.md

## Article Content:

# About Errors
Errors are a fundamental component of Wix's APIs, providing critical information and guidance when something goes wrong. 
Most of Wix's errors follow a standardized format, as described below.

## Error properties
| Property | Description | 
| :-------------- | :------- |  
| `message` | Textual description that provides a brief explanation of the error. |
| `details` | Additional contextual information about the error, including either `applicationError` or `validationError`. See the tables below. |

## Application error data
An application error occurs when the service business-logic decides to reject the request. This includes codes like `UNAUTHENTICATED`, `PERMISSION_DENIED`, `NOT_FOUND`, `ALREADY_EXISTS`, `ABORTED` and `RESOURCE_EXHAUSTED`.

| Property | Description | 
| :-------------- | :------- |    
| `code` | Identifier that categorizes and signifies the specific error. |
| `description` | Detailed explanation of why the error occurred. |
| `data` | Additional contextual information related to the error. |

### Examples
```json
{
  "message": "Payment failed",
  "details": {
    "applicationError": {
      "code": "NO_FUNDS",
      "description": "Payment declined due to insufficient funds",
      "data": {
        "availableFunds": 75.22
      }
    }
  }
}
```
```json
{
 "message": "Duplicate contact exists",
 "details": {
   "applicationError": {
     "code": "DUPLICATE_CONTACT_EXIST",
     "description": "Duplicate contact already exists",
     "data": {
       "duplicateContactId":"ca22360e-7f58-4613-bae6-a537f2791f84"
     }
   }
 }
}
```

## Validation error data
A validation error occurs when input data fails to meet predefined criteria or constraints set by the system. This type of error serves to enforce rules such as correct data formats, required fields, or value ranges. This includes rules like `OUT_OF_RANGE` and `INVALID_ARGUMENT`. Multiple violations may be returned in one response.

| Property | Description | 
| :-------------- | :------- |  
| `fieldViolations` | Array of validation issues found in individual fields. |
| `fieldViolations.field` | Field name. |
| `fieldViolations.description` | Detailed explanation of why the error occurred for the specified field. |
| `fieldViolations.violatedRule` | Specific rule or constraint that was violated by the input in the identified field. |
| `fieldViolations.ruleName` | Name of specific rule or constraint that was violated. For example, `"VALIDATION_ERROR"`.  |
| `fieldViolations.data` | Additional contextual information related to the field violation.  |


### Example
```json
{
  "message": "Not really valid",
  "details": {
    "validationError": {
      "fieldViolations": [
        {
          "field": "fieldA",
          "description": "Invalid musical note. Supported notes: [do,re,mi,fa,sol,la,ti]",
          "violatedRule": "CUSTOM",
          "ruleName": "INVALID_NOTE",
          "data": {
            "value": "FI"
          }
        },
        {
          "field": "fieldB",
          "description": "Field value out of range. Supported range: [0-20]",
          "violatedRule": "MAX",
          "data": {
            "threshold": 20
          }
        },
        {
          "field": "fieldC",
          "description": "Invalid phone number. Provide a valid phone number of size: [7-12]. Supported characters: [0-9, +, -, (, )]",
          "violatedRule": "FORMAT",
          "data": {
            "expected": "PHONE"
          }
        }
      ]
    }
  }
}
```

## System errors
A system error occurs when there's an exception in the system, the server is down, or some dependent service or database is down. These errors are sent empty by design.

### Example
```json
{
  "message": "",
  "details": {}
} 
```