How to get Angular JSON serializer to ignore null values?

I have an object that I send using HttpClient who may have some null properties. I wonder if there are any build-in solution(s) in Angular that ensure that null properties are not serialized.

Lets take this model for instance:

export class Dummy {
  public constructor(
    public readonly foo: string,
    public readonly bar: string
  ) { }
}

And this service:

import { HttpClient } from '@angular/common/http';

export class DummyService {
  public constructor(private readonly httpClient: HttpClient) { }

  public dummyMethod(dummyObject: Dummy): Observable<any> {
    return this.httpClient.Post('https://api.dummy/v1/dummies', dummyObject)
  }
}

If dummyObject === new Dummy("FooValue", null) then I expect this JSON to be serialized: { "foo": "FooValue" }

Solution

In JSON, values must be one of the following data types:
a string
a number
an object (JSON object)
an array
a boolean
null

So it can't ignore null. But we can't see undefined here, so you can use it instead of null and serialised object will omit it.