Skip to content

docs: clarify 415 vs 400 errors for request.json #5827

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: main
Choose a base branch
from
Open

docs: clarify 415 vs 400 errors for request.json #5827

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
1c956cd
docs: clarify 415 vs 400 errors for request.json
adityasah104 Oct 9, 2025
28f4f2c
docs: clarify 415 vs 400 errors for request.json
adityasah104 Oct 9, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 4 additions & 5 deletions docs/patterns/javascript.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -134,9 +134,7 @@ in a Flask view.

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.
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 415 Unsupported Media Type error.

.. code-block:: javascript

Expand Down Expand Up @@ -244,8 +242,9 @@ 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

Expand Down