marshmallow is a library for converting complex application objects into simpler data structures and transforming incoming data into validated application values. It combines serialization, deserialization and validation through a common schema interface.
Schemas describe how individual fields should be processed and which restrictions should apply to their values. This is particularly useful for web APIs, where data must be converted between external representations and internal application objects while preserving predictable behaviour.
The library is independent of any particular object-relational mapper, database or web framework. Developers can use it with plain application classes and adapt it to different storage or transport mechanisms.
marshmallow also provides hooks for applying additional processing before or after serialization and deserialization. Complex structures can be represented through nested schemas, allowing data models to be assembled from smaller reusable definitions.
This is free and open source software.
Key Features
- Define declarative schemas using fields with configurable constraints.
- Deserialize input data into validated application values.
- Serialize application objects into dictionaries and other simple structures.
- Validate strings, numbers, dates, collections and other common data types.
- Define custom fields and application-specific validation functions.
- Represent nested objects using reusable schemas.
- Handle collections of records through the many option.
- Configure required fields, missing values and field defaults.
- Include, exclude or reject unknown input fields.
- Support partial updates where some required fields may be omitted.
- Use processing hooks to transform data before or after loading and dumping.
- Provide structured validation errors associated with individual fields.
Website: github.com/marshmallow-code/marshmallow
Support:
Developer: Steven Loria and contributors
License: MIT License
marshmallow is written in Python. Learn Python with our recommended free books and free tutorials.
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