diff --git a/flow/record/jsonpacker.py b/flow/record/jsonpacker.py
index 344b5538..d971b818 100644
--- a/flow/record/jsonpacker.py
+++ b/flow/record/jsonpacker.py
@@ -49,12 +49,7 @@ def pack_obj(self, obj: Any) -> dict | str:
                 serial["_type"] = "record"
                 serial["_recorddescriptor"] = obj._desc.identifier
 
-            for field_type, field_name in obj._desc.get_field_tuples():
-                # Boolean field types should be cast to a bool instead of staying ints
-                if field_type == "boolean" and isinstance(serial[field_name], int):
-                    serial[field_name] = bool(serial[field_name])
-
-            return serial
+            return self.convert_basic_types(serial)
         if isinstance(obj, RecordDescriptor):
             return {
                 "_type": "recorddescriptor",
@@ -102,7 +97,19 @@ def unpack_obj(self, obj: Any) -> RecordDescriptor | Record | Any:
                 return RecordDescriptor._unpack(*data)
         return obj
 
-    def pack(self, obj: Record | RecordDescriptor) -> str:
+    def convert_basic_types(self, obj: Any) -> Any:
+        """Explicitly convert some basic types when packing to JSON."""
+        if isinstance(obj, fieldtypes.boolean):
+            return bool(obj)
+        if isinstance(obj, dict):
+            return {k: self.convert_basic_types(v) for k, v in obj.items()}
+        if isinstance(obj, list):
+            return [self.convert_basic_types(item) for item in obj]
+        return obj
+
+    def pack(self, obj: Record | RecordDescriptor | dict) -> str:
+        if isinstance(obj, dict):
+            obj = self.convert_basic_types(obj)
         return json.dumps(obj, default=self.pack_obj, indent=self.indent)
 
     def unpack(self, d: str) -> RecordDescriptor | Record:
diff --git a/tests/fieldtypes/test_boolean.py b/tests/fieldtypes/test_boolean.py
new file mode 100644
index 00000000..e3ee848f
--- /dev/null
+++ b/tests/fieldtypes/test_boolean.py
@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import pytest
+
+from flow.record.base import RecordDescriptor
+
+
+def test_boolean() -> None:
+    TestRecord = RecordDescriptor(
+        "test/boolean",
+        [
+            ("boolean", "booltrue"),
+            ("boolean", "boolfalse"),
+        ],
+    )
+
+    r = TestRecord(True, False)
+    assert bool(r.booltrue) is True
+    assert bool(r.boolfalse) is False
+
+    r = TestRecord(1, 0)
+    assert bool(r.booltrue) is True
+    assert bool(r.boolfalse) is False
+
+    assert str(r.booltrue) == "True"
+    assert str(r.boolfalse) == "False"
+
+    assert repr(r.booltrue) == "True"
+    assert repr(r.boolfalse) == "False"
+
+    with pytest.raises(ValueError, match="Value not a valid boolean value"):
+        TestRecord(2, -1)
+
+    with pytest.raises(ValueError, match="invalid literal for int"):
+        TestRecord("True", "False")
diff --git a/tests/fieldtypes/test_fieldtypes.py b/tests/fieldtypes/test_fieldtypes.py
index 46e9a392..6c6eb099 100644
--- a/tests/fieldtypes/test_fieldtypes.py
+++ b/tests/fieldtypes/test_fieldtypes.py
@@ -293,36 +293,6 @@ def test_dictlist() -> None:
     assert r.hits[1]["b"] == 4
 
 
-def test_boolean() -> None:
-    TestRecord = RecordDescriptor(
-        "test/boolean",
-        [
-            ("boolean", "booltrue"),
-            ("boolean", "boolfalse"),
-        ],
-    )
-
-    r = TestRecord(True, False)
-    assert bool(r.booltrue) is True
-    assert bool(r.boolfalse) is False
-
-    r = TestRecord(1, 0)
-    assert bool(r.booltrue) is True
-    assert bool(r.boolfalse) is False
-
-    assert str(r.booltrue) == "True"
-    assert str(r.boolfalse) == "False"
-
-    assert repr(r.booltrue) == "True"
-    assert repr(r.boolfalse) == "False"
-
-    with pytest.raises(ValueError, match="Value not a valid boolean value"):
-        r = TestRecord(2, -1)
-
-    with pytest.raises(ValueError, match="invalid literal for int"):
-        r = TestRecord("True", "False")
-
-
 def test_float() -> None:
     TestRecord = RecordDescriptor(
         "test/float",
diff --git a/tests/packer/test_json_packer.py b/tests/packer/test_json_packer.py
index 025b30d8..a6d94db1 100644
--- a/tests/packer/test_json_packer.py
+++ b/tests/packer/test_json_packer.py
@@ -93,6 +93,16 @@ def test_record_pack_bool_regression() -> None:
     # pack the json string back to a record and make sure it is the same as before
     assert packer.unpack(data) == record
 
+    # Make sure the same applies to an OrderedDict, which is how JsonRecordPacker is invoked for
+    # the Elastic adapter.
+    rdict = record._asdict()
+    data = packer.pack(rdict)
+    assert data.startswith('{"some_varint": 1, "some_uint": 0, "some_boolean": false, ')
+
+    # test that packer.pack has no side effects on rdict
+    assert rdict == record._asdict()
+    assert isinstance(rdict["some_boolean"], fieldtypes.boolean)
+
 
 def test_record_pack_surrogateescape() -> None:
     TestRecord = RecordDescriptor(