CamelCase not working in net core 6 web api

Question

I've migrated a web api application from net core 5 to 6 and changed NewtonSoft serializer by System.Text.Json. In my Startup.cs, I've configured Json serialization with the following code:

services.AddControllers(config =>
{
    config.RespectBrowserAcceptHeader = true;
    config.ReturnHttpNotAcceptable = true;
})
.AddJsonOptions(options =>
{
    options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles;
    options.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
    options.JsonSerializerOptions.WriteIndented = true;
})
.AddXmlDataContractSerializerFormatters();

This code is working only partially. WriteIndented is working fine (see screen capture below), but I can't get camelcase to work.

Any suggestions? Regards

Hello. The JsonNamingPolicy.CamelCase is used for PascalCase, for camelCase with lover first char, this might be helpfull: stackoverflow.com/questions/59559560/… — Klemikaze
– Klemikaze, Commented Jan 4, 2022 at 10:35
Hi @Klemikaze, you can check this docs: learn.microsoft.com/en-us/dotnet/standard/serialization/… — Jose L. Garcia
– Jose L. Garcia, Commented Jan 4, 2022 at 10:41
Can you share a minimal reproducible example? What does the type with {"Id" : 5, "Nombre": ""} look like? Is there any chance a custom converter is applied directly, or that the web api method is serializing manually? — dbc
– dbc, Commented Jan 4, 2022 at 14:07

Necip Sunmaz · Accepted Answer · 2022-03-08 22:18:29Z

5

After many tries I solved this problem. In latest version there is no default issue with "BaseController" but same issue with "ODataController".

The solution is;

services
.AddControllers(opt => opt.Filters.Add(typeof(ValidateModelAttribute)))
.AddJsonOptions(o => {
   o.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
   o.JsonSerializerOptions.DictionaryKeyPolicy = JsonNamingPolicy.CamelCase;
   o.JsonSerializerOptions.PropertyNameCaseInsensitive = true;
   o.JsonSerializerOptions.WriteIndented = true;
})
.AddOData(options => options.Select().Expand().Filter().OrderBy().SetMaxTop(32).Count());

1 Comment

Mike Over a year ago

I must be missing something... I don't see an answer here.

cortadillo0815 · Accepted Answer · 2023-02-28 14:07:24Z

0

Check your config. Maybe you are still using Newtonsoft somehow?

Being safe: configure both libraries...

services
.AddMvc()
.AddJsonOptions(options => {
    options.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
})
.AddNewtonsoftJson(options => {
    options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
    options.SerializerSettings.DateTimeZoneHandling = DateTimeZoneHandling.Utc;
    options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    // options.SerializerSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
});

answered Feb 28, 2023 at 14:07

cortadillo0815

495 bronze badges

Comments

Jeppe · Accepted Answer · 2024-03-31 08:09:33Z

0

In my case, I had the problem when POSTing to the server, e.g.:

{
   "myPropertyCamelCase": "..."
}

And got an error saying "MyPropertyCamelCase" was not set in the request, during model binding. The problem was a missing setter on the request property, e.g.

public MyPropertyCamelCase { get; }

should be

public MyPropertyCamelCase { get; set; }

Not sure if this is directly related.

answered Mar 31, 2024 at 8:09

Jeppe

2,3474 gold badges30 silver badges42 bronze badges

Comments

Emdadul Haque · Accepted Answer · 2022-06-05 12:37:28Z

-2

Simply add this in the program.cs file

using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;
using Newtonsoft.Json;
JsonConvert.DefaultSettings = () =>
 {
   var settings = new JsonSerializerSettings();
   settings.Converters.Add(new StringEnumConverter());
   settings.ContractResolver = new 
   CamelCasePropertyNamesContractResolver();
   return settings;
 };

answered Jun 5, 2022 at 12:37

Emdadul Haque

402 bronze badges

1 Comment

Rekesoft Over a year ago

The OP stated they are not using Newtonsoft.Json

user19616505 · Accepted Answer · 2022-07-25 09:36:49Z

-3

please try this way: Add option UseCamelCasing in NewtonsoftJson.

services.AddControllers()
                .AddNewtonsoftJson(options =>
                {
                    options.SerializerSettings.ContractResolver = new DefaultContractResolver();
                    options.UseCamelCasing(true); // additional line here
                });

answered Jul 25, 2022 at 9:36

user19616505

1

1 Comment

Wes Thompson Over a year ago

The question clearly states he replaced NewtonSoft with System.Text.Json.

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