OData is returning Upper-case properties when filtering - reactjs

Question

I'm working on a project which has a front-end made in Reactjs + axios, and a backend with .NET Core 3.1 Web API which is configured to allow OData filtering.
Everything is working fine, but I only have one small problem.
If I consume, e.g: GET /api/questions without any OData filtering, I receive:
[
{
"id": "005b46c6-1811-42f2-b917-00178e916d2e",
"value": "List the requirements for Schedule III, IV, & V Prescriptions.",
"required": true,
"sequence": 0,
"questionType": {
"id": "4227e559-3b14-4e07-b90e-73151f723698",
"name": "Rating",
"value": "rating-question",
"description": "a question in where the user rates the answer"
},
"ratingSetting": {
"id": "5e6a883a-084d-4400-bdf2-78b97e2eba18",
"name": "Poor to Excellent",
"minValueText": "Poor",
"maxValueText": "Excellent",
"optionCount": 5
},
"answers": []
},
...
]
But if I perform some filtering, for example: GET /api/admin/questions?$select=id, value&$expand=questionType($select=name)&$expand=ratingSetting($select=name) the result contains an array where every property has changed to Upper-case:
[
{
"QuestionType": {
"Name": "Rating"
},
"RatingSetting": {
"Name": "Poor to Excellent"
},
"Id": "005b46c6-1811-42f2-b917-00178e916d2e",
"Value": "List the requirements for Schedule III, IV, & V Prescriptions."
},
...
]
As you can see, every property is upper case. This is causing me trouble when I try to bind the result object, because it's not the same question.id against question.Id, so I'm having an undefined exception in the front-end.
Is there any configuration that I have to perform in my backend to solve this?

Answer 1

Make sure you are using a contract resolver by specifying the appropriate NewtonSoftJsonOptions:
services.AddControllers(options =>
options.EnableEndpointRouting = false)
.AddNewtonsoftJson(options =>
{
options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
});

Answer 2

Install these libraries:
<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
<PackageReference Include="Microsoft.AspNetCore.OData.NewtonsoftJson" Version="8.0.4" />
Then add this in startup.cs or program.cs:
services.AddControllers().AddOData(options =>
{
options.EnableQueryFeatures(maxTopValue: 500);
})
.AddODataNewtonsoftJson()
.AddNewtonsoftJson(options =>
{
options.SerializerSettings.ContractResolver =
new CamelCasePropertyNamesContractResolver();
options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
});