install

Next, execute command.:

$ pip install vjson

How to use

You define an object using JSONSchema.:

>>> import vjson
>>> _json = vjson.ValidatedJSON({
... 'type': 'object',
... 'properties': {
...     'price': {'type': 'number'},
...     'name': {'type': 'string'},
...     },
... })

This object can dumps/loads()/dump()/load() the serializable object, as in the json module.:

>>> _json.loads('{"name" : "Eggs", "price" : 34.99}')
{'name': 'Eggs', 'price': 34.99}
>>> _json.dumps({"name": "Eggs", "price": 34.99})
'{"name": "Eggs", "price": 34.99}'

If you try to pass the data that violates the JSONSchema that was specified in the constructor, it raises a vjson.JSONValidationError.:

>>> _json.loads('{"name" : "Eggs", "price" : "34.99"}')
Traceback (most recent call last):
  File "/tmp/test/var/src/develop/vjson/src/vjson/__init__.py", line 32, in _wrap
    jsonschema.validate(data, schema)
  File "/tmp/test/env/lib/python3.4/site-packages/jsonschema/validators.py", line 478, in validate
    cls(schema, *args, **kwargs).validate(instance)
  File "/tmp/test/env/lib/python3.4/site-packages/jsonschema/validators.py", line 123, in validate
    raise error
jsonschema.exceptions.ValidationError: '34.99' is not of type 'number'

Failed validating 'type' in schema['properties']['price']:
    {'type': 'number'}

On instance['price']:
    '34.99'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/test/var/src/develop/vjson/src/vjson/__init__.py", line 34, in _wrap
    raise JSONValidationError(err)
vjson.JSONValidationError: '34.99' is not of type 'number'

Failed validating 'type' in schema['properties']['price']:
    {'type': 'number'}

On instance['price']:
    '34.99'
>>>