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Editorial Team
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Asked: 2026-06-02T10:04:35+00:00

Am I missing something? I am trying to return model validation errors from my

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Am I missing something? I am trying to return model validation errors from my web api update method like this

public void Update  public void UpdateModel(Models.Model entity) {
        ModelState.AddModelError("name","error");
        return;

However the JSON returned has no validation errors

For example in this article enter link description here

When I try to use a validation filter as in the previous article on this link I get the error Action xxxxx has one or more filters applied that do not derive from AuthorizationFilterAttribute. Only authorization filters are supported on DataController Insert/Update/Delete actions.

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1 Answer

  1. Editorial Team

    ModelState isnt accessible from your JSON, unless you specifically serialize it as such. It’s more used from the HtmlHelper extensions behind the scenes. If you’re attempting to update the UI as if the model state was marked as such, you’re going about it all wrong. You can either:

    1. Do a full post to the server and let it render the appropriate response
    2. Take the json you get back and then style the fields as appropriate for that response.
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