I Compared 6 TypeScript Validation Libraries. What Surprised Me 🤔

说明与用途

比较六种 TypeScript 验证库表明，选择取决于简洁性、包大小和功能需求。手写 guard 简单但难以扩展；is‑kit 提供可重用的谓词；Runtypes 提供完整的验证器对象；Valibot 提供模块化模式；Zod 提供生态系统优势；ArkType 和 typia 在类型推断和转换方面表现出色。

问题

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

结果

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.

工作流

• 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

证据

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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