Marshmallow is the Python package that can serialize, deserialize and validate JSON data.

It's useful for web services when processing the incoming JSON data and responses in JSON format.

Installation

python3 -m venv .venv
source .venv/bin/activate
python3 -m pip install marshmallow
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Examples

Simple Example

This example demonstrates the following features:

  • Validation and deserialization using Schema.load().
  • Preprocess the input data using @post_load.
from marshmallow import Schema, fields, validate, post_load


class Person(Schema):
    name = fields.Str(required=True)
    gender = fields.Str(required=True, validate=validate.OneOf({"male", "female", "other"}))
    email = fields.Email(required=True)
    registration_datetime = fields.DateTime("%Y-%m-%dT%H:%M:%S%z")

    @post_load
    def convert_to_utc_datetime(self, data, **kwargs):
        data["registration_datetime"] = data["registration_datetime"].astimezone(datetime.timezone.utc)
        return data

person_schema = Person()
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>>> person_data = {"name": "Tommy", "gender": "male", "email": "tommy@example.com", "registration_datetime": "2022-07-06T08:00:00+08:00"}
>>> person_schema.load(person_data)

{'gender': 'male',
 'name': 'Tommy',
 'registration_datetime': datetime.datetime(2022, 7, 6, 0, 0, tzinfo=datetime.timezone.utc),
 'email': 'tommy@example.com'}
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>>> invalid_person_data = {"name": "Tommy", "gender": "mmale", "email": "tommy@example.com", "registration_datetime": "2022-07-06T08:00:00+08:00"}
>>> person_schema.load(invalid_person_data)

ValidationError: {'gender': ['Must be one of: female, other, male.']}
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# python # json
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