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copied!<h1>Updated for 2018</h1> <p>The original answer accommodated the way MongoDB "date" fields were represented as:</p> <p><code>{"$date": 1506816000000}</code></p> <p>If you want a generic Python solution for serializing <code>datetime</code> to json, check out <a href="https://stackoverflow.com/a/36142844/293064">@jjmontes' answer</a> for a quick solution which requires no dependencies.</p> <hr> <p>As you are using mongoengine (per comments) and pymongo is a dependency, pymongo has built-in utilities to help with json serialization:<br> <a href="http://api.mongodb.org/python/1.10.1/api/bson/json_util.html" rel="noreferrer">http://api.mongodb.org/python/1.10.1/api/bson/json_util.html</a></p> <p>Example usage (serialization):</p> <pre><code>from bson import json_util import json json.dumps(anObject, default=json_util.default) </code></pre> <p>Example usage (deserialization):</p> <pre><code>json.loads(aJsonString, object_hook=json_util.object_hook) </code></pre> <hr> <h2>Django</h2> <p>Django provides a native <code>DjangoJSONEncoder</code> serializer that deals with this kind of properly.</p> <p>See <a href="https://docs.djangoproject.com/en/dev/topics/serialization/#djangojsonencoder" rel="noreferrer">https://docs.djangoproject.com/en/dev/topics/serialization/#djangojsonencoder</a></p> <pre><code>from django.core.serializers.json import DjangoJSONEncoder return json.dumps( item, sort_keys=True, indent=1, cls=DjangoJSONEncoder ) </code></pre> <p>One difference I've noticed between <code>DjangoJSONEncoder</code> and using a custom <code>default</code> like this:</p> <pre><code>def default(o): if type(o) is datetime.date or type(o) is datetime.datetime: return o.isoformat() return json.dumps( item, sort_keys=True, indent=1, default=default ) </code></pre> <p>Is that Django strips a bit of the data:</p> <pre><code> "last_login": "2018-08-03T10:51:42.990", # DjangoJSONEncoder "last_login": "2018-08-03T10:51:42.990239", # default </code></pre> <p>So, you may need to be careful about that in some cases.</p>

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