How can I increase the JSON deserialization MaxDepth limit in my ASP.NET Core webapp

Question

We're using ASP.NET Core 2.1 with .NET Framework 4.6.2.

We have a customer who needs to send up a rather largely nested json structure to our webapp.

When they make this call, we're outputting the following log and returning an error:

The reader's MaxDepth of 32 has been exceeded. Path 'super.long.path.to property', line 1, position 42111."

I've looked through the ASP.NET Core codebase, and have observed a couple of references to MaxDepth = 32 in the deserializer provided with the framework.

Is it possible to configure this to a different depth?

Answer 1

I have not tested this, but in Startup.cs you should be able to do something like this:

services.AddMvc().AddJsonOptions(options => {
    options.SerializerSettings.MaxDepth = 64;  // or however deep you need
});

Answer 2

You could also set depth you need directly in deserialization as shown in the following example:

JsonConvert.DeserializeObject< T >(json, new JsonSerializerSettings
{
    MaxDepth = //the value you need
});

Answer 3

If you are using .NET Core 3.1, try this in your startup.cs file. Make sure to install the Newtonsoft.Json package.

services.AddMvc().AddNewtonsoftJson(options =>
{
    options.SerializerSettings.MaxDepth = 64;
});