greyblake/nutype

Health v2 · maintenance only

Adoption not part of the score

1761 stars · 34 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Nutype is a Rust procedural macro that enhances the newtype pattern with built-in sanitization and validation constraints. It guarantees that values cannot be instantiated without passing the defined checks, including during serde deserialization.

Use cases

• validate user input like usernames and emails in Rust
• enforce invariants on newtype wrappers
• sanitize and trim strings before storing them
• make invalid states unrepresentable with types
• validate data during serde deserialization
• define constrained numeric types with min/max bounds

When to choose

• you use Rust and want type-safe validated domain types
• you want validation enforced at construction time rather than scattered checks
• you need sanitization plus validation in one declarative macro
• you want invalid values rejected even through serde deserialization

When to avoid

• you need runtime-configurable validation rules
• your project is not in Rust
• you need validation across struct fields rather than single values
• you prefer schema-based validation libraries like validator with attribute macros on structs

Facets

library · maturity active

serialization type-system developer-tools developer-tools web-development programming-languages rust newtype validation sanitization proc-macro invariants type-safety serde

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