remove deprecated json encoding parameter

CHANGES.rst

@@ -12,6 +12,7 @@ Unreleased
     -   The CLI does not pass ``script_info`` to app factory functions.
     -   ``config.from_json`` is replaced by
         ``config.from_file(name, load=json.load)``.
+    -   ``json`` functions no longer take an ``encoding`` parameter.
 
 
 Version 2.0.2

src/flask/json/__init__.py

@@ -1,10 +1,8 @@
 import dataclasses
 import decimal
-import io
 import json as _json
 import typing as t
 import uuid
-import warnings
 from datetime import date
 
 from jinja2.utils import htmlsafe_json_dumps as _jinja_htmlsafe_dumps
@@ -124,20 +122,7 @@ def dumps(obj: t.Any, app: t.Optional["Flask"] = None, **kwargs: t.Any) -> str:
         context for configuration.
     """
     _dump_arg_defaults(kwargs, app=app)
-    encoding = kwargs.pop("encoding", None)
+    return _json.dumps(obj, **kwargs)
-    rv = _json.dumps(obj, **kwargs)
-
-    if encoding is not None:
-        warnings.warn(
-            "'encoding' is deprecated and will be removed in Flask 2.1.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-
-        if isinstance(rv, str):
-            return rv.encode(encoding)  # type: ignore
-
-    return rv
 
 
 def dump(
@@ -159,23 +144,6 @@ def dump(
         deprecated and will be removed in Flask 2.1.
     """
     _dump_arg_defaults(kwargs, app=app)
-    encoding = kwargs.pop("encoding", None)
-    show_warning = encoding is not None
-
-    try:
-        fp.write("")
-    except TypeError:
-        show_warning = True
-        fp = io.TextIOWrapper(fp, encoding or "utf-8")  # type: ignore
-
-    if show_warning:
-        warnings.warn(
-            "Writing to a binary file, and the 'encoding' argument, is"
-            " deprecated and will be removed in Flask 2.1.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-
     _json.dump(obj, fp, **kwargs)
 
 
@@ -199,19 +167,6 @@ def loads(s: str, app: t.Optional["Flask"] = None, **kwargs: t.Any) -> t.Any:
         context for configuration.
     """
     _load_arg_defaults(kwargs, app=app)
-    encoding = kwargs.pop("encoding", None)
-
-    if encoding is not None:
-        warnings.warn(
-            "'encoding' is deprecated and will be removed in Flask 2.1."
-            " The data must be a string or UTF-8 bytes.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-
-        if isinstance(s, bytes):
-            s = s.decode(encoding)
-
     return _json.loads(s, **kwargs)
 
 
@@ -231,20 +186,6 @@ def load(fp: t.IO[str], app: t.Optional["Flask"] = None, **kwargs: t.Any) -> t.A
         file must be text mode, or binary mode with UTF-8 bytes.
     """
     _load_arg_defaults(kwargs, app=app)
-    encoding = kwargs.pop("encoding", None)
-
-    if encoding is not None:
-        warnings.warn(
-            "'encoding' is deprecated and will be removed in Flask 2.1."
-            " The file must be text mode, or binary mode with UTF-8"
-            " bytes.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-
-        if isinstance(fp.read(0), bytes):
-            fp = io.TextIOWrapper(fp, encoding)  # type: ignore
-
     return _json.load(fp, **kwargs)