Top VALIDATION GitHub Repositories & Tools (2026)

TypeScript-first schema validation with static type inference

📋 React Hooks for form state management and validation (Web + React Native)

The most awesome validation engine ever created for PHP

Python Toolkit for Causal and Probabilistic Reasoning

Client Side Validations made easy for Ruby on Rails

:mailbox: Cross-language temporary (disposable/throwaway) email detection library. Covers 55 734+ fake email providers.

Date and time validation plugin for ActiveModel and Rails. Supports multiple ORMs and allows custom date/time formats.

PHP receipt validator for Apple iTunes, Google Play and Amazon App Store

RevenueCat SDK for Android & Jetpack Compose, easy in-app purchases and subscriptions.

The data-validation toolkit for enhanced dbt (data build tool) PR review

A PHP library for performing email addresses validation via SMTP

Simple Form plugin for ClientSideValidations

Batfish is a network configuration analysis tool that can find bugs and guarantee the correctness of (planned or current) network configurations. It enables network engineers to rapidly and safely evolve their network, without fear of outages or security breaches.

AtroPIM is a flexible, highly configurable, modular, open-source product information management (PIM) system that extends the AtroCore data management and system integration platform.

A library for using FluentValidation with Blazor EditForm components. Provides seamless integration between FluentValidation and Blazor forms with support for real-time validation, nested objects, async validation, and rule sets.

Pure Python HWPX automation: read, edit, generate, and validate documents without Hancom Office.

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

A configuration as code language with rich validation and tooling.

GraphQL Router / API Gateway framework written in Golang, focussing on correctness, extensibility, and high-performance. Supports Federation v1 & v2, Subscriptions & more.

:100:Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving