Data Validation & Schemas Packages
Runtime data validation and schema-definition libraries for catching malformed input before it reaches your application logic (Zod, Pydantic, Valibot).
Packages in Data Validation & Schemas
Zod
TypeScript-first schema validation with static type inference and zero dependencies.
Pydantic
Data validation and settings management using Python type hints, backed by a Rust core.
@hookform/resolvers
Official React Hook Form adapters that plug 20+ schema-validation libraries — Zod, Yup, Joi, Valibot, ArkType and more — straight into useForm's resolver.
FastAPI
A modern, high-performance Python web framework for building APIs with automatic validation, serialization, and interactive docs.
Ajv
The fastest JSON Schema validator for Node.js and the browser, compiling schemas straight into executable validation code.
prop-types
Runtime type checking for React component props, warning in development when data doesn't match the declared shape.
packaging
Core Python utilities for versions, specifiers, markers, requirements, and metadata
ipaddr.js
A dependency-free JavaScript library for parsing, validating, and manipulating IPv4 and IPv6 addresses.
zod-to-json-schema
Converts Zod validation schemas into standard JSON Schema, ready for OpenAPI, OpenAI, and JSON Schema draft 7 consumers.
validator.js
A dependency-free library of 100+ string validators and sanitizers for Node.js and the browser.
jsonschema
The reference implementation of JSON Schema validation for Python, supporting every draft from 3 to 2020-12.
pydantic-settings
Type-safe application settings management for Python, built on Pydantic models.
ajv-formats
ajv-formats: JSON Schema Format Validators for Ajv v8+
class-validator
Decorator-based property validation for TypeScript and JavaScript classes, on both Node.js and the browser.
attrs
Python classes without boilerplate — generate init, repr, equality, and more from declarative field definitions.
