Converting object properties/values to string or json

Hi expert,

I want to convert class properties and values to string or json. For example:

class A{
  int id;
  String name;
  public A(){
    this.id = 10;
    this.name = "somebody";
  }
}

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The expected json string output is like:

{"id":10,"name":"somebody"}

or

id=10,name="somebody"