valibot downloads — last 12 months
Valibot is a modern, type-safe schema library designed for robust data validation and parsing. It addresses the common problem of ensuring data integrity, especially in web applications where data comes from untrusted sources like user input, API responses, or environment variables. By defining explicit schemas, Valibot allows developers to validate incoming data against these definitions, catching errors early and preventing unexpected behavior downstream.
The library's core philosophy centers around modularity, type safety, and an intuitive API. It aims to provide a developer experience that is both enjoyable and highly reliable, particularly for projects built with TypeScript. Its design prioritizes clear error messages and predictable outcomes, making it suitable for a wide range of developers, from individual contributors to larger teams.
Valibot's API is built around schema definition and transformation. Key functions include `object`, `string`, `number`, and `boolean` for defining structural types, alongside higher-order utilities like `array`, `nullable`, and `union` for complex data structures. It also features `parse` and `safeParse` for data validation, and `transform` for data manipulation, allowing for schema-driven data conversion.
Integration points for Valibot are broad, fitting seamlessly into modern JavaScript and TypeScript workflows. It's commonly used with frontend frameworks like React and Vue, and backend environments using Node.js. Its compatibility with build tools and package managers ensures easy adoption in existing projects. It can be effectively used alongside ORMs and data fetching libraries to validate data at various stages of an application.
With a minimal unpacked size of 1.8 MB and a gzipped bundle size of just 15.2 kB, Valibot is exceptionally lightweight. This focus on performance and small bundle size makes it an excellent choice for performance-sensitive applications and environments where payload size is critical. The library is actively maintained, indicating a good level of maturity and ongoing support.
- When defining and validating complex object structures with nested properties and custom validation rules.
- When integrating with frontend frameworks like React or Vue and needing to validate form inputs at runtime.
- When parsing and validating API responses to ensure they conform to expected shapes and types.
- When leveraging TypeScript's type system to enforce schema adherence during development and catch errors early.
- When building server-side applications with Node.js that require robust input validation for request payloads.
- When prioritizing a small bundle size without sacrificing powerful validation capabilities.
- If you only require extremely simple type checks for primitive values and don't need structural validation.
- If your project's validation needs are trivial and can be adequately met by basic JavaScript type guards or assertions.
- If you are in an environment with extremely severe JavaScript execution limitations where even a small library introduces significant overhead.
- If you prefer a more declarative, decorator-based approach to schema definition rather than a programmatic one.
- If your primary need is to generate frontend code from backend schemas, as Valibot focuses mainly on runtime validation and parsing.
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