Error validation [Answered]

   [Required]
    [MinLength(8, ErrorMessage = "Password too short")]
    [MaxLength(32, ErrorMessage ="Password too long")]
    public string Password { get; set; }

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "00-7e6431d39d15726ab988a4d46bcfec16-79d8864992a8a975-00",
    "errors": {
        "Password": [
            "Password too short"
        ]
    }
}

                return BadRequest(new {Errors = new {Email = new string[]{"That email is already registered."}}});

      var problemDetails = new ProblemDetails {
                    Detail = "Email already registered",
                };
                problemDetails.Extensions.Add("Errors", new List<Dictionary<string, string[]>> ()
                {
                   new Dictionary<string, string[]>() {{"Email", new string[]{ "Email is already registered"}}}
                });
                return BadRequest(problemDetails);