Using Flask jsonify with PyMongo Objects

Flask has a handy utility to return json encoded responses from its web controllers. I like to use mongodb for toy projects because its easy to set up and started with. Jsonify doesn't know what to do with PyMongo's ObjectID data types. Here's a drop in replacement I've found useful on a few projects.

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import json

def jsonifym(d):
    "jsonifier that works with mongo objects"
    return json.dumps(d, default=json_util.default)

def my_endpoint():
    return jsonifym(my_mongo_db_instance_object)

2014-05-03