How to return 400 response using the same format that Asp.Net Core validation uses?

Question

I use model validation in Asp.Net Core and it returns 400 errors like that:

{
    "errors": {
        "MyProperty": [
            "Error 1",
            "Error 2"
        ]
    },
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "0HLRTF1TPCO60:00000002"
}

I do have my custom validation that does not use Asp.Net core built-in mechanisms, but I'd like to generate the error in exact same format so that it would be easier for users to consume. I can of course just generate JSON myself, but I think there is some built-in API to generate such an error from model, though I cannot manage to find what should I call.

P.S. I want to do this in middleware

Ilya Chernomordik · Accepted Answer · 2019-12-11 15:34:50Z

3

I have figured out myself how this can be achieved:

var modelState = new ModelStateDictionary();
modelState.AddModelError("FieldName", "ErrorMessage");
var details = new ValidationProblemDetails(modelState);
details.Status = (int?) HttpStatusCode.BadRequest;
details.Extensions["traceId"] = context.TraceIdentifier;

The details can later be serialized to JSON.

answered Dec 11, 2019 at 15:34

Ilya Chernomordik

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