Globally ignore null values for all properties and subclasses (without JsonSerializerOptions)

[Joelius300]

Because IJSRuntime won't support customizable serialization there is currently no way of using JsonSerializerOptions with IgnoreNullValues = true. This seems like a functionality which shouldn't be missing as it leads to dead-ends really fast - but sadly the AspNetCore-team has confirmed that this is not planned and won't be added.

To work around this I thought of something like a JsonIgnoreNullValuesAttribute.

You could use the JsonIgnoreNullValuesAttribute on the whole class or single properties. Furthermore it would be nice to have something like a Recursive: bool-property on the JsonIgnoreNullValuesAttribute which would allow you to also ignore null-properties of a property in this class without adding the attribute to that class as well.

See the below example:

[JsonIgnoreNullValues(Recursive = true)]
class TopLevelClass
{
    public OtherClass NestedProperty {get; set;}
}

class OtherClass
{
    public string Name {get; set;}
    public int Level {get; set;}
}

void Serialize()
{
    var obj = new TopLevelClass 
    {
        NestedProperty = new OtherClass
        {
            Level = 2,
            Name = null
        }
    }

    // Serializing obj (without any options) would result in this json:
    /*
    {
        "NestedProperty": {
            "Level": 2
        }
    }
    */
}

It would probably be much better and simpler to add a new (optional) parameter to IJSRuntime.InvokeAsync of type JsonSerializerOptions but this sadly seems to not be possible.

EDIT: There is a pending feature request for IJSRuntime which I really hope gets accepted. Maybe JsonIgnoreNullValuesAttribute is still a feature which seems worth implementing but just so I'm clear, I would currently not need it if the other feature request passes.

As far as I know this serializer is still worked on so there will be many features added, right? In the roadmap there aren't many features listed that are currently being worked on. Am I looking in the wrong place or are these not publicly available?

Hello, I have the same problem as the previous user, because as I can change the behavior of the JSRuntime serialization to be able to indicate how I can do the realization, how to omit null properties, I am trying to use Google Maps and I have errors when I pass a serialized class that does not Nulls should appear and you are trying unexpected errors.
It would be necessary to implement an attribute to the libraru System.Text.Json that allows to indicate which elements to omit when they are null or to be able to modify the behavior of the serializer of the JSRuntime that it has by default, I do not understand that the serializer behavior cannot be modified.

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