ASP.NET Core Binding case sensitivity

Question

I created CRUD controller. When creating a model, I need to use schema:

{ "id": int, "name": string }

But the controller also binds the schema

{ "Id": int, "Name": string }

How can I force the controller bind only lowercase version { "id": int, "name": string } ?

Answer 1

The default JsonSerializerOptions values for web apps is case-insensitive.

Taken from these docs (see the note):

By default, deserialization looks for case-sensitive property name matches between JSON and the target object properties. To change that behavior, set JsonSerializerOptions.PropertyNameCaseInsensitive to true:

Note

The web default is case-insensitive.

You want to configure the serializer to use PropertyNameCaseInsensitive = false in order to be case-sensitive.

You can configure the options in ConfigureServices method in Startup.cs:

services.AddControllers()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.PropertyNameCaseInsensitive = false;
    });

or in .NET 6 using minimal API:

builder.Services.Configure<JsonOptions>(options =>
{
    options.SerializerOptions.PropertyNameCaseInsensitive = false;
});