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clarify 415 vs 400 errors for request.json (#5827)

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ADITYA SAH 2026-01-25 08:16:56 +05:30 • committed by GitHub
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docs/patterns/javascript.rst
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@ -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 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 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 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 .. code-block:: javascript
@ -244,8 +245,9 @@ Receiving JSON in Views
Use the :attr:`~flask.Request.json` property of the Use the :attr:`~flask.Request.json` property of the
:data:`~flask.request` object to decode the request's body as JSON. If :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 the body is not valid JSON, a 400 Bad Request error will be raised. If
``application/json``, a 400 Bad Request error will be raised. the ``Content-Type`` header is not set to ``application/json``, a 415
Unsupported Media Type error will be raised.
.. code-block:: python .. code-block:: python