diff --git a/pandas/core/arrays/interval.py b/pandas/core/arrays/interval.py
index f9fbd7ada376e..a0319fe96896a 100644
--- a/pandas/core/arrays/interval.py
+++ b/pandas/core/arrays/interval.py
@@ -139,7 +139,6 @@
     )
 )
 class IntervalArray(IntervalMixin, ExtensionArray):
-    dtype = IntervalDtype()
     ndim = 1
     can_hold_na = True
     _na_value = _fill_value = np.nan
diff --git a/pandas/core/indexes/timedeltas.py b/pandas/core/indexes/timedeltas.py
index 29ed3c6b97318..ecadd11894bfb 100644
--- a/pandas/core/indexes/timedeltas.py
+++ b/pandas/core/indexes/timedeltas.py
@@ -176,7 +176,6 @@ def _join_i8_wrapper(joinf, **kwargs):
 
     _freq = None
 
-    _box_func = TimedeltaArray._box_func
     _bool_ops = TimedeltaArray._bool_ops
     _object_ops = TimedeltaArray._object_ops
     _field_ops = TimedeltaArray._field_ops
diff --git a/pandas/io/json/__init__.py b/pandas/io/json/__init__.py
index cbb4e37fae6a1..2382d993df96b 100644
--- a/pandas/io/json/__init__.py
+++ b/pandas/io/json/__init__.py
@@ -1,5 +1,12 @@
-from .json import dumps, loads, read_json, to_json  # noqa
-from .normalize import json_normalize  # noqa
-from .table_schema import build_table_schema  # noqa
+from pandas.io.json._json import dumps, loads, read_json, to_json
+from pandas.io.json._normalize import json_normalize
+from pandas.io.json._table_schema import build_table_schema
 
-del json, normalize, table_schema  # noqa
+__all__ = [
+    "dumps",
+    "loads",
+    "read_json",
+    "to_json",
+    "json_normalize",
+    "build_table_schema",
+]
diff --git a/pandas/io/json/json.py b/pandas/io/json/_json.py
similarity index 99%
rename from pandas/io/json/json.py
rename to pandas/io/json/_json.py
index f3f0f417acaab..1f0728ee96469 100644
--- a/pandas/io/json/json.py
+++ b/pandas/io/json/_json.py
@@ -23,8 +23,8 @@
 from pandas.io.formats.printing import pprint_thing
 from pandas.io.parsers import _validate_integer
 
-from .normalize import _convert_to_line_delimits
-from .table_schema import build_table_schema, parse_table_schema
+from ._normalize import convert_to_line_delimits
+from ._table_schema import build_table_schema, parse_table_schema
 
 loads = json.loads
 dumps = json.dumps
@@ -79,7 +79,7 @@ def to_json(
     ).write()
 
     if lines:
-        s = _convert_to_line_delimits(s)
+        s = convert_to_line_delimits(s)
 
     if isinstance(path_or_buf, str):
         fh, handles = _get_handle(path_or_buf, "w", compression=compression)
diff --git a/pandas/io/json/normalize.py b/pandas/io/json/_normalize.py
similarity index 99%
rename from pandas/io/json/normalize.py
rename to pandas/io/json/_normalize.py
index c09dc177ccbd1..a6fde86297a3d 100644
--- a/pandas/io/json/normalize.py
+++ b/pandas/io/json/_normalize.py
@@ -12,7 +12,7 @@
 from pandas import DataFrame
 
 
-def _convert_to_line_delimits(s):
+def convert_to_line_delimits(s):
     """
     Helper function that converts JSON lists to line delimited JSON.
     """
diff --git a/pandas/io/json/table_schema.py b/pandas/io/json/_table_schema.py
similarity index 100%
rename from pandas/io/json/table_schema.py
rename to pandas/io/json/_table_schema.py
diff --git a/pandas/tests/io/json/test_json_table_schema.py b/pandas/tests/io/json/test_json_table_schema.py
index 28c8837731ec1..7b0b9a523f9de 100644
--- a/pandas/tests/io/json/test_json_table_schema.py
+++ b/pandas/tests/io/json/test_json_table_schema.py
@@ -11,7 +11,7 @@
 from pandas import DataFrame
 import pandas.util.testing as tm
 
-from pandas.io.json.table_schema import (
+from pandas.io.json._table_schema import (
     as_json_table_type,
     build_table_schema,
     convert_json_field_to_pandas_type,
diff --git a/pandas/tests/io/json/test_normalize.py b/pandas/tests/io/json/test_normalize.py
index 82cd00c2d121d..d355e20c24e59 100644
--- a/pandas/tests/io/json/test_normalize.py
+++ b/pandas/tests/io/json/test_normalize.py
@@ -7,7 +7,7 @@
 import pandas.util.testing as tm
 
 from pandas.io.json import json_normalize
-from pandas.io.json.normalize import nested_to_record
+from pandas.io.json._normalize import nested_to_record
 
 
 @pytest.fixture
diff --git a/pandas/tests/io/json/test_readlines.py b/pandas/tests/io/json/test_readlines.py
index a99488509f336..821bf0287c6f1 100644
--- a/pandas/tests/io/json/test_readlines.py
+++ b/pandas/tests/io/json/test_readlines.py
@@ -7,7 +7,7 @@
 import pandas.util.testing as tm
 from pandas.util.testing import assert_frame_equal, assert_series_equal, ensure_clean
 
-from pandas.io.json.json import JsonReader
+from pandas.io.json._json import JsonReader
 
 
 @pytest.fixture