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Valibot

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Validate unknown data with confidence using this modular and type-safe schema library for TypeScript.

Developer ToolsTesting & QAAPI Tools
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Tracked since2026
0 reviews tracked

The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Significantly reduces bundle size compared to alternatives like Zod (up to 95%)

Biggest con

Relies on partners and sponsors for funding, which could impact long-term development if not sustained

TL;DR - Valibot

  • Type-safe schema library for TypeScript data validation.
  • Modular design for minimal bundle size through tree shaking.
  • Validates diverse TypeScript types at runtime.
Pricing: Free forever
Best for: Individuals & startups

What is Valibot?

Editorial review
Valibot is an open-source schema library for TypeScript designed to validate unknown data with a focus on bundle size, type safety, and developer experience. It allows developers to define schemas that describe structured data sets, similar to TypeScript type definitions, but with the crucial difference that Valibot schemas can be executed at runtime to guarantee the type safety of incoming data. This makes it ideal for scenarios where data originates from external sources and needs rigorous validation. The library's modular design is a core differentiator, enabling significant bundle size reductions through tree shaking and code splitting. This is particularly beneficial for client-side form validation and serverless environments where minimizing payload size is critical. Valibot supports validation for almost any TypeScript type, from primitive values to complex objects, and includes important validation and transformation helpers. It boasts 100% test coverage and offers a minimal, readable, and well-thought-out API to ensure a great developer experience.

Available on: Web

how we evaluateSourcevalibot.dev ↗

Pros & Cons

Pros

  • Significantly reduces bundle size compared to alternatives like Zod (up to 95%)
  • Ensures type safety of unknown data at runtime
  • Open source and free to use under the MIT License
  • Excellent developer experience due to well-designed API
  • Comprehensive test coverage for reliability

Cons

  • Relies on partners and sponsors for funding, which could impact long-term development if not sustained

Preview

Key Features

Fully type safe with static type inferenceModular API design for small bundle size (less than 700 bytes initially)Supports validation of almost any TypeScript typeIncludes important validation and transformation helpers100% test coverage for source codeMinimal, readable, and well-thought-out API

Pricing

Free

Valibot is completely free to use with no hidden costs.

View pricing

Is Valibot worth the price?

100/100

Valibot is entirely free, making its pricing exceptionally fair and generous compared to any market alternative.

This model is ideal for all developers and organizations looking for a robust schema validation library without any financial commitment.

Hidden Costs & Gotchas

No hidden costs; the library is open-source.

How Valibot Compares to Competitors

Compared to Zod, which is also free and open-source, Valibot offers a similar value proposition. Both provide powerful type-safe schema validation without any direct cost, making them highly competitive in the developer tool space.

Reviews

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Valibot FAQ

How does Valibot ensure data integrity from external sources?

Valibot allows developers to define executable schemas that validate incoming data at runtime. This process guarantees the type safety of information originating from external sources, ensuring it conforms to expected structures and types before being used in an application.

Which teams would benefit most from using Valibot?

Teams working on client-side applications or serverless environments would find Valibot particularly beneficial. Its focus on minimizing bundle size through a modular design helps optimize performance in these resource-sensitive contexts.

How is Valibot priced?

Valibot is open source and completely free to use under the MIT License. There are no paid plans or features, making it accessible for all developers without cost.

What kind of validation capabilities does Valibot offer?

Valibot supports validation for a wide range of TypeScript types, from basic primitive values to intricate object structures. It also includes essential validation and transformation helpers to manage diverse data requirements.

How does Valibot compare to Zod in terms of performance?

Valibot significantly reduces bundle size compared to alternatives like Zod, offering up to a 95% reduction. This is achieved through its modular design and effective tree shaking capabilities.

Can Valibot be used for API data validation?

Yes, Valibot is well-suited for API data validation as it falls under the API Tools category. It enables rigorous validation of unknown data, which is crucial when consuming or providing data through APIs to ensure type safety and correctness.

Source: valibot.dev

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