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Alternatives · Schema & validation

Alternatives to pydantic on PyPI

For validating untrusted input and shaping data. Below are packages that fill the same role — on PyPI, and across other ecosystems.

Cross-language equivalents

npm· JavaScript

TypeScript-first schema declaration and validation library with static type inference

MaintenanceHealthy

PopularityUnknown

Maintained. Maintained, actively maintained.

Dead simple Object schema validation

MaintenanceAging

PopularityUnknown

Aging — last published 8 months ago — check before adopting.

Object schema validation

MaintenanceHealthy

PopularityUnknown

Maintained. Maintained, actively maintained.

crates.io· Rust

A generic serialization/deserialization framework

MaintenanceAging

PopularityTop 1%

Aging — last published 8 months ago — check before adopting.

validatorv0.20.0

Common validation functions (email, url, length, ...) and trait - to be used with `validator_derive`

MaintenanceAging

PopularityTop 1%

Aging — last published over a year ago — check before adopting.

RubyGems· Ruby

dry-validationv1.11.1

Validation library

MaintenanceAging

PopularityWidely used

Aging — last published over a year ago — check before adopting.

Go· Go

github.com/go-playground/validator/v10vv10.30.3

No description provided.

MaintenanceHealthy

PopularityUnknown

Maintained. Maintained, actively maintained.

Maven· Java

jakarta.validation:jakarta.validation-apiv4.0.0-M1

No description provided.

MaintenanceAging

PopularityUnknown

Aging — last published 7 months ago — check before adopting.

NuGet· .NET

fluentvalidationv12.1.1

No description provided.

MaintenanceHealthy

PopularityUnknown

Maintained. Maintained, actively maintained.

These suggestions come from a hand-curated concept map of canonical packages per role. They’re intentionally narrow — only widely-adopted packages in each category. Phase 5 will add AI-generated alternatives.