Marshmallow

Marshmallow is an open-source Python library designed to simplify data validation and serialization. It allows developers to define schemas that specify the structure, types, and constraints of data, making it easier to validate input and transform complex data into formats suitable for storage or transmission. Used in web development and APIs, Marshmallow ensures data consistency and helps handle errors gracefully. Its clear, declarative syntax makes defining and managing data schemas straightforward, enhancing code readability and maintainability.