JSONResult.SerializerSettings Must Be of Type System.Text.Json.JsonSerializerOptions

Environment

Product Version	14.0.20.219
Product	Progress® Telerik® Reporting
.Net Framework	.NET Core 3.0

Description

If the Telerik Reporting REST Service project is targeting .NET Core 3.0+ and is throwing the error JSONResult.SerializerSettings Must Be of Type System.Text.Json.JsonSerializerOptions

Solution

1. Add the NuGet Package, Microsoft.AspNetCore.Mvc.NewtonsoftJson

2. Append .AddNewtonsoftJson() to any of the following services configurations:

   services.AddControllers().AddNewtonsoftJson();
   services.AddControllersWithViews().AddNewtonsoftJson();
   services.AddRazorPages().AddNewtonsoftJson();
   

See Also

• ASP.NET Core 3.0+ Telerik Reporting REST Service