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Custom datatypes (like datetime) serialization to/from JSON.

Project description

Serialization of Python types to JSON done right.

No more errors like:

TypeError: datetime.datetime(...) is not JSON serializable

In addition to (de-)serialization of basic types (provided by simplejson), jsonplus provides support for exact (de-)serialization of other commonly used types, like: tuple/namedtuple, set/frozenset, complex/decimal.Decimal/fractions.Fraction, and datetime/date/time/timedelta.


jsonplus is available as Python package. To install, simply type:

$ pip install jsonplus


You can treat jsonplus as a friendly drop-in replacement for json/simplejson.

>>> import jsonplus as json
>>> x = json.loads('{"a":1,"b":2}')
>>> y = json.dumps(x, indent=4)
>>> z = json.pretty(x)


Let’s start with that beloved datetime.

>>> import jsonplus as json

>>> from datetime import datetime
>>> json.dumps({
...     "x": [4,3],
...     "t":
... })

>>> json.loads(_)
{u'x': [4, 3], u't': datetime.datetime(2013, 9, 6, 23, 38, 55, 819791)}

Similarly for other datetime.* types, like timedelta, date, and time:

>>> from datetime import timedelta, date, time
>>> print json.pretty({"dt": timedelta(0, 1234567, 123), "d":, "t":})
    "d": {
        "__class__": "date",
        "__value__": "2013-09-22"
    "dt": {
        "__class__": "timedelta",
        "__value__": {
            "days": 14,
            "microseconds": 123,
            "seconds": 24967
    "t": {
        "__class__": "time",
        "__value__": "23:33:16.335360"

Also, set and complex:

>>> json.dumps([set(range(3)), 1+2j])

>>> json.loads(_)
[set([0, 1, 2]), (1+2j)]

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