Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
All Packages
Category
Tags2
Sort:Used by Most Apps
Zod
TypeScript-first schema validation with static type inference and zero dependencies.
React Hook Form
Performant, flexible React forms built on hooks with minimal re-renders and built-in validation.
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.
Ajv
The fastest JSON Schema validator for Node.js and the browser, compiling schemas straight into executable validation code.
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.
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.
validator
Go struct and field validation using reflection-based tags, with cross-field, cross-struct, and nested slice/array/map diving support.
Formik
Formik: Build React Forms Without the Tears - Docs & Guide
Valibot
Modular, type-safe schema validation library with bundle sizes starting under 1KB
joi
The most powerful schema description language and data validator for JavaScript
email-validator
Robust email address syntax and deliverability validation for Python
@apidevtools/swagger-parser
Parses, validates, and dereferences Swagger 2.0 and OpenAPI 3.x specs in Node.js and browsers