AddJsonOptions not found in ASP.NET Core 2.0

Question

I'm migrating my ASP.NET 1.1 project to 2.0:

Inside the Setup class, under the Configure method override I have:

services.AddMvc()
    .AddJsonOptions(options =>
        options.SerializerSettings.Converters.Add(new StringEnumConverter())
    );

The AddJsonOptions method is missing.

What happened to it? How can I get the same functionality?

It doesn't seem to have gone anywhere - It works in my ASP.NET Core 2.0 project. It's defined in [`MvcJsonMvcBuilderExtensions`](https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNetCore.Mvc.Formatters.Json/DependencyInjection/MvcJsonMvcBuilderExtensions.cs). — Kirk Larkin, Sep 05 '17 at 11:58
it's still there; make sure you're using the right packages and ns, `ctrl + .` is your friend — The Bearded Llama, Sep 05 '17 at 12:21
Had to still separately add `using Newtonsoft.Json.Serialization;` depending what you want to do next. In my case I wanted `AddJsonOptions(options => options.SerializerSettings.ContractResolver = new DefaultContractResolver());` but `DefaultContractResolver` is not recognized. Really annoying that you have to magically intuit the requirement for all these damn things in .NET. — mc01, May 10 '19 at 22:11

score 15 · Accepted Answer · edited Sep 05 '17 at 12:59

AddJsonOptions is defined in Microsoft.AspNetCore.Mvc.Formatters.Json nuget package.

If your project has a dependency to Microsoft.AspNetCore.All metapackage (in your .csproj: <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0"/> ) then you already have it. Otherwise, you may need to add that package directly.

After that do:

dotnet restore
check that you have using Microsoft.Extensions.DependencyInjection;

AddJsonOptions not found in ASP.NET Core 2.0

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