diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8549b016..b1c2a876 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -2,12 +2,18 @@ repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: 45ef068da5f21267bb2a7ec4a623092959f09ce5  # frozen: v0.14.14
     hooks:
-      - id: ruff
+      - id: ruff-check
       - id: ruff-format
   - repo: https://github.com/astral-sh/uv-pre-commit
     rev: 8afdb18d56d3bd3edea0c4ddde96965d6894f5f3  # frozen: 0.9.26
     hooks:
       - id: uv-lock
+  - repo: https://github.com/codespell-project/codespell
+    rev: 63c8f8312b7559622c0d82815639671ae42132ac  # frozen v2.4.1
+    hooks:
+      - id: codespell
+        additional_dependencies:
+          - tomli
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: 3e8a8703264a2f4a69428a0aa4dcb512790b2c8c  # frozen: v6.0.0
     hooks:
diff --git a/docs/patterns/javascript.rst b/docs/patterns/javascript.rst
index d58a3eb6..b97ffc6d 100644
--- a/docs/patterns/javascript.rst
+++ b/docs/patterns/javascript.rst
@@ -136,7 +136,8 @@ In general, prefer sending request data as form data, as would be used
 when submitting an HTML form. JSON can represent more complex data, but
 unless you need that it's better to stick with the simpler format. When
 sending JSON data, the ``Content-Type: application/json`` header must be
-sent as well, otherwise Flask will return a 400 error.
+sent as well, otherwise Flask will return a 415 Unsupported Media Type
+error.
 
 .. code-block:: javascript
 
@@ -244,8 +245,9 @@ Receiving JSON in Views
 
 Use the :attr:`~flask.Request.json` property of the
 :data:`~flask.request` object to decode the request's body as JSON. If
-the body is not valid JSON, or the ``Content-Type`` header is not set to
-``application/json``, a 400 Bad Request error will be raised.
+the body is not valid JSON, a 400 Bad Request error will be raised. If
+the ``Content-Type`` header is not set to ``application/json``, a 415
+Unsupported Media Type error will be raised.
 
 .. code-block:: python
 
diff --git a/pyproject.toml b/pyproject.toml
index 006b44ab..6722be86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -168,6 +168,9 @@ ignore = [
 force-single-line = true
 order-by-type = false
 
+[tool.codespell]
+ignore-words-list = "te"
+
 [tool.tox]
 env_list = [
     "py3.14", "py3.14t",
diff --git a/src/flask/app.py b/src/flask/app.py
index e0c193dc..0fc92728 100644
--- a/src/flask/app.py
+++ b/src/flask/app.py
@@ -358,7 +358,7 @@ class Flask(App):
                 f"{self.static_url_path}/<path:filename>",
                 endpoint="static",
                 host=static_host,
-                view_func=lambda **kw: self_ref().send_static_file(**kw),  # type: ignore # noqa: B950
+                view_func=lambda **kw: self_ref().send_static_file(**kw),  # type: ignore
             )
 
     def get_send_file_max_age(self, filename: str | None) -> int | None:
@@ -1568,7 +1568,7 @@ class Flask(App):
             except Exception as e:
                 error = e
                 response = self.handle_exception(ctx, e)
-            except:  # noqa: B001
+            except:
                 error = sys.exc_info()[1]
                 raise
             return response(environ, start_response)
diff --git a/src/flask/sansio/app.py b/src/flask/sansio/app.py
index 82349dae..0195b16c 100644
--- a/src/flask/sansio/app.py
+++ b/src/flask/sansio/app.py
@@ -530,7 +530,7 @@ class App(Scaffold):
         """
         return DispatchingJinjaLoader(self)
 
-    def select_jinja_autoescape(self, filename: str) -> bool:
+    def select_jinja_autoescape(self, filename: str | None) -> bool:
         """Returns ``True`` if autoescaping should be active for the given
         template name. If no template name is given, returns `True`.
 
diff --git a/src/flask/sessions.py b/src/flask/sessions.py
index c1d978d3..1841d882 100644
--- a/src/flask/sessions.py
+++ b/src/flask/sessions.py
@@ -107,7 +107,7 @@ class NullSession(SecureCookieSession):
             "application to something unique and secret."
         )
 
-    __setitem__ = __delitem__ = clear = pop = popitem = update = setdefault = _fail  # noqa: B950
+    __setitem__ = __delitem__ = clear = pop = popitem = update = setdefault = _fail
     del _fail