Schema-First

Validate and convert OpenAPI specification via Marshmallow schemas to Marshmallow schemas.

Schema-First

Features

OpenAPI specification validate.
Convert OpenAPI schemas to Marshmallow schemas.

Installation

Recommended using the latest version of Python. Schema-First supports Python 3.14 and newer.

Install and update using pip:

$ pip install -U schema_first

Example

Create specification - openapi.yaml:

openapi: 3.1.1
info:
    title: Example API for testing Flask-First
    version: 1.0.1
paths:
    /endpoint:
        get:
            operationId: endpoint
            responses:
                '200':
                    content:
                        application/json:
                            schema:
                                properties:
                                    message:
                                        type: string
                                type: object
                    description: OK

Create script - main.py:

from pathlib import Path
from pprint import pprint

from schema_first.specification import Specification

spec_file = Path('openapi.yaml')
spec = Specification(spec_file)
spec.load()

pprint(spec.reassembly_spec)
print(
    'Marshmallow schema generated from OpenAPI schema',
    spec.reassembly_spec['paths']['/endpoint']['get']['responses']['200']['content'][
        'application/json'
    ]['schema'],
)

More example see to ./example folder.

Additional documentation

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