How to snake_case requests with minimal api?

[Wuerike]

Hi!

I'm writing an application that requires both request paramenters and response body to be in snake_case

With the following code I've managed to serialize the response, but it doesn't affect the request deserialization.

builder.Services.Configure<JsonOptions>(options =>
{
    options.SerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower;
});

Worth say that what I mean by request isn't the body, but the query parameters. At the endpoint I'm getting the query string with the AsParameters

I'm running 8.0.100-preview.6.23330.14

[moxplod]

Facing this exact issue today.

[davidfowl]

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/minimal-apis/responses?view=aspnetcore-9.0#configure-json-serialization-options-globally

[moxplod]

I actually realized that my issue was the query string working differently than the global serialization options. As that uses model binding vs json serialization options. When I changed everything to snake case the document changed the request parameter to snake case as well. But it doesn’t deserialize correctly.