Controllers/MailController.cs

@@ -45,9 +45,14 @@ namespace rockfishCore.Controllers
 
 
         [HttpPost("reply/{account}/{id}")]
-        public JsonResult Reply([FromRoute] string account, [FromRoute] uint id, [FromBody] dtoReplyMessageItem m)
+        public ActionResult Reply([FromRoute] string account, [FromRoute] uint id, [FromBody] dtoReplyMessageItem m)
         {
-            if (string.IsNullOrWhiteSpace(m.composition))
+            if (!ModelState.IsValid)
+            {
+                return BadRequest();
+            }
+
+            if (m==null || string.IsNullOrWhiteSpace(m.composition))
             {
                 return Json(new { msg = "MailController:Reply->There is no reply text", error = 1 });
             }

Startup.cs

@@ -42,7 +42,7 @@ namespace rockfishCore
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
-            services.AddControllers();
+            services.AddControllers().AddNewtonsoftJson();
             services.AddDbContext<rockfishContext>(options =>
             {
                 options.UseSqlite(Configuration.GetConnectionString("rfdb")).EnableSensitiveDataLogging(false);
@@ -111,9 +111,8 @@ namespace rockfishCore
             app.UseRouting();
 
             app.UseAuthorization();
-
             app.UseEndpoints(endpoints =>
-            {
+            { 
                 endpoints.MapControllers();
 
             });

rockfishCore.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="jose-jwt" Version="2.5.0" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="3.1.4" />  
     <PackageReference Include="mailkit" Version="2.7.0" />
-    <!-- <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.4" /> -->
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.4" />
   </ItemGroup>
 
 </Project>