Displaying model state errors after ajax call on Razor views

var allErrors = ModelState.Values.SelectMany(v => v.Errors);

Then manually show errors. Get form validator:

var validator = $("form").validate();

Then check that your fields are initialized correctly, for example you can look here (optional step):

validator.settings.rules

validator.settings.messages

If everything is fine, then you could show error:

validator.showErrors({"Password": "Too simple!"});

Where Password is field name and Too simple! is error message.

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