I Compared 6 TypeScript Validation Libraries. What Surprised Me 🤔

Описание и применение

Сравнение шести библиотек валидации TypeScript показывает, что выбор зависит от требований к простоте, размеру пакета и функциональности. Handwritten guard прост, но не масштабируем; is‑kit обеспечивает переиспользуемые предикаты; Runtypes предоставляет полноценные валидаторы; Valibot — модульные схемы; Zod — экосистема; ArkType и typia — продвинутая типизация и трансформации.

Задача

Choosing a runtime validation library in TypeScript that balances simplicity, type safety, and feature set for JSON‑decoded data.

Результат

The comparison shows that no single library is best for all scenarios. Handwritten guards are simplest but hard to scale; is‑kit offers composable predicates; Runtypes provides richer validator objects; Valibot gives modular schemas; Zod offers ecosystem benefits; ArkType and typia excel in type inference and transformations. Developers should match library choice to specific needs such as bundle size, feature set, and integration requirements.

Рабочий процесс

• Define shared User type and runtime rules
• Implement validation with handwritten guard
• Implement with is‑kit predicates and struct
• Implement with Runtypes validator object
• Implement with Valibot strictObject and pipe
• Implement with Zod strictObject and refine
• Benchmark bundle size and runtime performance
• Analyze feature differences and trade‑offs

Доказательства

I implemented the same User validation with: a handwritten guard with a TypeScript predicate, is‑kit, Runtypes, Valibot, Zod, ArkType, typia

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Handwritten guard has a huge advantage: There is no extra model to learn

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safeParse() gives a small success/failure result around a guard

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Runtypes moves one level further. Instead of just a boolean predicate, you get a runtime validator object with several ways to consume it.

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Valibot is where the comparison starts looking more "schema-like".

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Zod does not expose a built‑in is() method, but this adapter can narrow input because this schema has no transforms.

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