C#•16mo ago

❔ Change default behaviour of .NET Web API Validation Errors

Hi does anyone know how I can override the default problem details/validation error response .net gives when things like Guid and DateTime's are in an incorrect format?

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "00-9f2acabaefdccec268c6f8bc2594d0ba-bdd955faf7e6202a-00",
    "errors": {
        "command": [
            "The command field is required."
        ],
        "$.boardId": [
            "The JSON value could not be converted to System.Guid. Path: $.boardId | LineNumber: 0 | BytePositionInLine: 30."
        ]
    }
}

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "00-9f2acabaefdccec268c6f8bc2594d0ba-bdd955faf7e6202a-00",
    "errors": {
        "command": [
            "The command field is required."
        ],
        "$.boardId": [
            "The JSON value could not be converted to System.Guid. Path: $.boardId | LineNumber: 0 | BytePositionInLine: 30."
        ]
    }
}

I have implemented my own validation error responses but can't seem to avoid these type of ones firing^ Mine look like this:

{
    "status": 422,
    "message": "Validation errors occurred",
    "errors": [
        {
            "property": "BoardId",
            "message": "Board Id is required."
        }
    ]
}

{
    "status": 422,
    "message": "Validation errors occurred",
    "errors": [
        {
            "property": "BoardId",
            "message": "Board Id is required."
        }
    ]
}

FYI: my validation logic is driven by FluentValidation, I'm not using attributes etc.

3 Replies

blueberriesiftheywerecats•16mo ago

https://learn.microsoft.com/en-us/aspnet/core/mvc/advanced/custom-model-binding?view=aspnetcore-7.0

Custom Model Binding in ASP.NET Core

Learn how model binding allows controller actions to work directly with model types in ASP.NET Core.

blueberriesiftheywerecats•16mo ago

https://stackoverflow.com/questions/53697300/asp-net-core-customize-the-error-when-model-binding-fails

Stack Overflow

ASP.NET Core customize the error when model binding fails

I try to apply back end validation whenever empty or invalid values are send to ASP.NET Core Web API endpoint, but I can't figure out how to handle model binding failure errors. Getting this error

Accord•16mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Change default behaviour of .NET Web API Validation Errors