marshmallow-code/marshmallow

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

7242 stars · 729 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

marshmallow is a lightweight, framework-agnostic Python library for converting complex objects to and from native Python datatypes using declarative schemas. It supports serialization, deserialization, and input data validation, commonly used to render objects to JSON for HTTP APIs.

Use cases

• validate incoming API request payloads in Python
• serialize ORM objects to JSON for a REST API
• deserialize JSON into typed app-level objects
• define reusable data schemas with nested fields
• sanitize and coerce untrusted input data types

When to choose

• you need framework-agnostic serialization and validation in Python
• you want lightweight schemas without a heavy dependency
• you need nested object serialization to and from JSON-friendly types

When to avoid

• you need high-performance binary serialization like protobuf or msgpack
• you want automatic schema generation from models with no manual field definitions
• you need Rust/C-level serde performance

Facets

library · maturity stable

serialization form-handling developer-tools apis web-development python cross-platform schema deserialization data-validation orm-agnostic data-engineering

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