validate

public class ModelValidationMiddleware
{
    private readonly RequestDelegate _next;

    public ModelValidationMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext context)
    {
        if (!context.Request.Path.StartsWithSegments("/api"))
        {
            await _next(context);
            return;
        }

        var modelState = context.Features.Get<Microsoft.AspNetCore.Mvc.ModelBinding.Validation.IValidationFeature>()?.ModelState;
        if (modelState != null && !modelState.IsValid)
        {
            var errors = modelState.Values.SelectMany(v => v.Errors.Select(e => e.ErrorMessage)).ToList();
            var response = new ApiResponse(false, "Model validation failed", errors: errors);
            context.Response.StatusCode = 400; // Bad Request
            context.Response.ContentType = "application/json";

            var responseText = JsonSerializer.Serialize(response);
            await context.Response.WriteAsync(responseText);
            return;
        }

        await _next(context);
    }
}