Asp.net core invalid JSON

Question

I have a problem sending a post request to my asp.net Server.

My Json looks like this:

{
     "Name":"NothingZeile224","FimDocument":"PHhkZjp4ZW5zY2hlbWEuMDEwMj4=","FimCodelistPicks":[]
}

And when I send it via a HttpRequestMessage in the Body to my Server I get this response:

{
    "errors": {
        "": [
            "Unexpected character encountered while parsing value: {. Path '', line 1, position 1."
        ]
    },
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "|1db3b81f-4ca934b691097e16."
}

If I delete the brace in my JSON so it looks like this:

"Name":"NothingZeile224","FimDocument":"PHhkZjp4ZW5zY2hlbWEuMDEwMj4=","FimCodelistPicks":[]

It works.

But I don't get why? Does someone have an idea?

Thank you

Edit:

This is my Server Code:

[Produces("application/json")]
    [ApiController]
    public class MainController : ControllerBase
    {
        [HttpPost]
        [Route("api/ConvertToCirali")]
        public async Task<string> ConvertToCirali([FromBody] string PostSendFim)
        {
            try
            {
                PostModel pm = (PostModel)Newtonsoft.Json.JsonConvert.DeserializeObject(PostSendFim);

                XDocument fim = XDocument.Parse(System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(pm.FimDocument)));

                string jsonOutput = Newtonsoft.Json.JsonConvert.SerializeObject(pm.FimCodelists);

                string MyContent = null;

                using (HttpClient client = new HttpClient())
                {
                    client.DefaultRequestHeaders.Add("Content-Type", "application/json");
                    using (HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "https://localhost:44398/api/FullCodelists"))
                    {
                        using (StringContent stringContent = new StringContent(Convert.ToBase64String(Encoding.UTF8.GetBytes(jsonOutput)), Encoding.UTF8, "application/json"))
                        {
                            request.Content = stringContent;
                            using (HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead))
                            {
                                MyContent = await response.Content.ReadAsStringAsync();
                            }
                        }
                    }
                }

                List<MongoCodelist> ReturnedCodelists = new List<MongoCodelist>();
                ReturnedCodelists = (List<MongoCodelist>)Newtonsoft.Json.JsonConvert.DeserializeObject(MyContent);

                FormatterFimToCirali fftc = new FormatterFimToCirali(fim, ReturnedCodelists);

                Debug.WriteLine("Hier steht der Text: " + fftc.CiraliFile.ToString());
                return Convert.ToBase64String(Encoding.UTF8.GetBytes(fftc.CiraliFile.ToString()));
            }
            catch (Exception ex)
            {
                return ex.ToString();
            }
        }
    }

Sorry if it looks a bit weird, it is for a converter for files from a game

Answer 1

You have declared your parameter as string, so you need to send it a JSON string, not a JSON object. This string is then deserialized in your code at

PostModel pm = (PostModel)Newtonsoft.Json.JsonConvert.DeserializeObject(PostSendFim);

You can skip a step and let the framework do the deserialization for you. Just change the parameter type to PostModel instead of string .