webargs

webargs is a Python library for declarative parsing and validation of HTTP request objects. It provides built-in support for popular web frameworks, including Flask, Django, Bottle, Tornado, Pyramid, Falcon, and aiohttp. Leveraging Marshmallow under the hood, it offers a consistent API for defining request arguments and handling validation errors across different frameworks. The library is actively maintained, with the current stable version being 8.7.1.