JavaScript validation libraries

Packages in this category

• Zod: TypeScript-first schema validation with static type inference.
• Valibot: The modular and type-safe schema library for validating structural data.
• joi: Object schema validation
• yup: Dead simple Object schema validation
• @sinclair/typebox: Json Schema Type Builder with Static Type Resolution for TypeScript
• ajv: Another JSON Schema Validator
• arktype: TypeScript's 1:1 validator, optimized from editor to runtime
• superstruct: A simple and composable way to validate data in JavaScript (and TypeScript).
• Validator.js: Validation library inspired by Laravel's Validator

What to compare

• Review schema parsing, coercion, error formatting, and asynchronous-validation needs in the official API.
• Check whether the required declaration files are bundled and how the documented inference model fits your code.
• Look for explicit support for interchange formats or integrations rather than assuming all schema tools are interchangeable.
• Compare equivalent schema imports and retain peer-dependency exclusions when interpreting size measurements.

Example package specifications

zod

valibot

Category comparisons

• Zod vs Valibot