How to serialize private fields in json-serializable?

Question

Minimal reproducible code:

@JsonSerializable()
class A {
  final int _x;
  A(int x) : _x = x;

  factory A.fromJson(Map<String, dynamic> json) => _$AFromJson(json);
}

Note:

I don't want to make my private field _x public or define a public x getter.

Answer 1

This PR addresses what you want: https://github.com/google/json_serializable.dart/pull/1256/files#diff-0acaf4c472e452d1e5d215a15fcd2266ccd02ab6abdfac0080c2fca845eb9096

You will be able to explicitly set includeFromJson and includeToJson on the private fields you want to include.

Example:

class X {   
  @JsonKey(includeFromJson: true, includeToJson: true)
  int _includeMeToTheJsonParsing;
}

It was merged November 30th. Latest package version is v6.5.4, released at October 25th. So you will need to wait a little bit if you want the official release. Otherwise, you can point directly to the latest commit if you need it ASAP.