<ul><li>Marshmallow and SerializerMixin are used for data serialization in Python to convert model instances into JSON-friendly dictionaries.</li><li>SerializerMixin is simple and fast, suitable for prototyping or debugging, but can become messy when dealing with relationships or custom outputs.</li><li>Marshmallow allows developers to define schemas for explicit control over JSON serialization, providing features like automatic field generation, validation, and support for nested relationships.</li><li>For applications with complex data structures or specific needs, Marshmallow is a better option as it separates serialization logic from model logic and offers a consistent, readable structure.</li></ul>

Back-End Data Serialization in Python: A Practical Comparison of SerializerMixin and Marshmallow

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