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==========
jsonschema
==========
``jsonschema`` is an implementation of `JSON Schema <http://json-schema.org>`_
for Python (supporting 2.6+ including Python 3).
.. code-block:: python
>>> from jsonschema import validate
>>> # A sample schema, like what we'd get from json.load()
>>> schema = {
... "type" : "object",
... "properties" : {
... "price" : {"type" : "number"},
... "name" : {"type" : "string"},
... },
... }
>>> # If no exception is raised by validate(), the instance is valid.
>>> validate({"name" : "Eggs", "price" : 34.99}, schema)
>>> validate(
... {"name" : "Eggs", "price" : "Invalid"}, schema
... ) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
ValidationError: 'Invalid' is not of type 'number'
Features
--------
* Full support for
`Draft 3 <https://python-jsonschema.readthedocs.org/en/latest/validate.html#jsonschema.Draft3Validator>`_
**and** `Draft 4 <https://python-jsonschema.readthedocs.org/en/latest/validate.html#jsonschema.Draft4Validator>`_
of the schema.
* `Lazy validation <https://python-jsonschema.readthedocs.org/en/latest/validate.html#jsonschema.IValidator.iter_errors>`_
that can iteratively report *all* validation errors.
* Small and extensible
* `Programmatic querying <https://python-jsonschema.readthedocs.org/en/latest/errors.html#module-jsonschema>`_
of which properties or items failed validation.
Release Notes
-------------
``v1.4.0`` adds a better interface for creating and extending validators in the
form of ``jsonschema.validators.create`` and ``jsonschema.validators.extend``.
The documentation is still a bit lacking in this area but it's getting there.
See the tests in ``jsonschema.tests.test_validators`` and the source code if
you'd like to try it out now.
It also fixes a number of issues with ref resolution, one for array indices
(#95) and one for improper handling of unknown URI schemes (#102).
Running the Test Suite
----------------------
``jsonschema`` uses the wonderful `Tox <http://tox.readthedocs.org>`_ for its
test suite. (It really is wonderful, if for some reason you haven't heard of
it, you really should use it for your projects).
Assuming you have ``tox`` installed (perhaps via ``pip install tox`` or your
package manager), just run ``tox`` in the directory of your source checkout to
run ``jsonschema``'s test suite on all of the versions of Python ``jsonschema``
supports. Note that you'll need to have all of those versions installed in
order to run the tests on each of them, otherwise ``tox`` will skip (and fail)
the tests on that version.
Of course you're also free to just run the tests on a single version with your
favorite test runner. The tests live in the ``jsonschema.tests`` package.
Community
---------
There's a `mailing list <https://groups.google.com/forum/#!forum/jsonschema>`_ for this implementation on Google Groups.
Please join, and feel free to send questions there.
Contributing
------------
I'm Julian Berman.
``jsonschema`` is on `GitHub <http://github.com/Julian/jsonschema>`_.
Get in touch, via GitHub or otherwise, if you've got something to contribute,
it'd be most welcome!
You can also generally find me on Freenode (nick: ``tos9``) in various
channels, including ``#python``.
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