Is Dataannotation compatible with Json?

Question

Hello! I would like to know if Dataannotation is compatible with Json, because I am validating a form and I would like to ask the question. I am using Angular on the front and returning my object in Json format, I would like to validate the return of that json (the information that the user typed in the fields) using Dataannotation

That’s my method of adding:

[HttpPost]
public async Task<string> Add([FromBody]Sindicate objSindicate)
{
    return JsonConvert.SerializeObject(await _service.Add(objSindicate));
}

This is my class using Dataannotation.

public class SindicateValidator
{
    [Key]

    public Guid SindicateId { get; set; }

    [Required(ErrorMessage = "Nome obrigatório!")]
    [MaxLength(128, ErrorMessage = "Máximo {0} caracteres")]
    [MinLength(2, ErrorMessage = "Minímo {0} caracteres")]
    public string Name { get; set; }

    [Required(ErrorMessage = "Razão Social é obrigatório!")]
    [MaxLength(128, ErrorMessage = "Máximo {0} caracteres")]
    [MinLength(2, ErrorMessage = "Minímo {0} caracteres")]
    public string SocialReason { get; set; }

    [Required(ErrorMessage = "CNPJ é obrigatório!")]
    [DisplayFormat(DataFormatString = "{0:n2}", 
                    ApplyFormatInEditMode = true)]
    [MaxLength(14, ErrorMessage = "Máximo {0} caracteres")]
    public string CNPJ { get; set; }

    [Required(ErrorMessage = "Login é obrigatório!")]
    [MaxLength(128,ErrorMessage = "Máximo {0} caracteres")]
    public string Login { get; set; }

    [Required(ErrorMessage = "Senha é obrigatório!")]
    [MaxLength(8, ErrorMessage = "Máximo {0} caracteres")]
    public string Password { get; set; }

    [Required(ErrorMessage = "E-Mail é obrigatório!")]
    [MaxLength(128, ErrorMessage = "Máximo {0} caracteres")]
    [EmailAddress(ErrorMessage = "Preencha um E-mail válido!")]
    public string Email { get; set; }

    [ScaffoldColumn(false)]
    public DateTime DateCreated { get; set; }

    [ScaffoldColumn(false)]
    public bool Disable { get; set; }

    [ScaffoldColumn(false)]
    public DateTime? DateDisable { get; set; }

    [ScaffoldColumn(false)]
    public bool Deleted { get; set; }

    [ScaffoldColumn(false)]
    public DateTime? DateDeleted { get; set; }
}

Answer 1

To Controller will validate the input independent of Content-Type used, but it is important that the input is with the ratings.

Another point, the API by default will serialize the return to JSON, then there is no need to serializar the object previously.

[HttpPost]
public async Task<IHttpActionResult> Add([FromBody]SindicateValidator objSindicate)
{
    if (!ModelState.IsValid)
        return BadRequest(ModelState);
    var response = await _service.Add(objSindicate);
    return Ok(response);
}