1.pydantic / pydantic
Data validation using Python type hints
+1,809 stars
from 27,457 · score 7.50
Trending repositories
Ranked by Attention Score: stars gained over the last 180 complete days
55 repositories by Attention Score · May 7, 2026 – Nov 2, 2026 (UTC)
2.567-labs / instructor
structured outputs for llms
+1,257 stars
from 12,831 · score 7.14
3.open-circle / valibot
The modular and type safe schema library for validating structural data 🤖
+509 stars
from 8,545 · score 6.23
4.react-hook-form / react-hook-form
📋 React Hooks for form state management and validation (Web + React Native)
+490 stars
from 44,408 · score 6.20
5.go-playground / validator
:100:Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
+424 stars
from 19,791 · score 6.05
6.apple / pkl
A configuration as code language with rich validation and tooling.
+307 stars
from 11,248 · score 5.73
7.json-schema-org / json-schema-spec
The JSON Schema specification
+262 stars
from 4,943 · score 5.57
8.unionai-oss / pandera
A light-weight, flexible, and expressive statistical data testing library
+201 stars
from 4,306 · score 5.31
9.typestack / class-validator
Decorator-based property validation for classes.
+134 stars
from 11,719 · score 4.91
10.Respect / Validation
The most awesome validation engine ever created for PHP
+118 stars
from 5,917 · score 4.78
11.validatorjs / validator.js
String validation
+99 stars
from 23,647 · score 4.61
12.AfterShip / email-verifier
:white_check_mark: A Go library for email verification without sending any emails.
+94 stars
from 1,556 · score 4.55
13.go-ozzo / ozzo-validation
An idiomatic Go (golang) validation package. Supports configurable and extensible validation rules (validators) using normal language constructs instead of error-prone struct tags.
+88 stars
from 4,067 · score 4.49
14.python-jsonschema / jsonschema
An implementation of the JSON Schema specification for Python
+71 stars
from 4,923 · score 4.28
15.logaretm / vee-validate
✅ Painless Vue forms
+63 stars
from 11,197 · score 4.16
16.metosin / malli
High-performance data-driven data specification library for Clojure/Script.
+59 stars
from 1,716 · score 4.09
17.hapijs / joi
The most powerful data validation library for JS
+57 stars
from 21,110 · score 4.06
18.Oudwins / zog
Go with Zod inspired simple schema validation
+53 stars
from 1,167 · score 3.99
19.marmelroy / PhoneNumberKit
A Swift framework for parsing, formatting and validating international phone numbers. Inspired by Google's libphonenumber.
+48 stars
from 5,345 · score 3.89
20.Propaganistas / Laravel-Phone
Phone number functionality for Laravel
+46 stars
from 2,994 · score 3.85
21.gookit / validate
⚔ Go package for data validation and filtering. support Map, Struct, Form data. Go通用的数据验证与过滤库，使用简单，内置大部分常用验证、过滤器，支持自定义验证器、自定义消息、字段翻译。
+45 stars
from 1,120 · score 3.83
22.cakephp / cakephp
CakePHP: The Rapid Development Framework for PHP - Official Repository
+44 stars
from 8,745 · score 3.81
23.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
+44 stars
from 7,201 · score 3.81
24.remult / remult
Full-stack CRUD, simplified, with SSOT TypeScript entities
+36 stars
from 3,178 · score 3.61
25.asaskevich / govalidator
[Go] Package of validators and sanitizers for strings, numerics, slices and structs
+26 stars
from 6,177 · score 3.30
26.wundergraph / graphql-go-tools
GraphQL Router / API Gateway framework written in Golang, focussing on correctness, extensibility, and high-performance. Supports Federation v1 & v2, Subscriptions & more.
+23 stars
from 814 · score 3.18
27.FirelyTeam / firely-net-sdk
The official Firely .NET SDK for HL7 FHIR
+22 stars
from 918 · score 3.14
28.ealush / vest
Vest ✅ Declarative validations framework
+21 stars
from 2,648 · score 3.09
29.h2non / filetype
Fast, dependency-free Go package to infer binary file types based on the magic numbers header signature
+20 stars
from 2,283 · score 3.04
30.pallets-eco / wtforms
A flexible forms validation and rendering library for Python.
+17 stars
from 1,566 · score 2.89
31.ianstormtaylor / superstruct
A simple and composable way to validate data in JavaScript (and TypeScript).
+13 stars
from 7,114 · score 2.64
32.nobl9 / govy
Go validation library with functional API built on top of generics, statically typed and batteries included :fire:
+12 stars
from 43 · score 2.56
33.vlucas / valitron
Valitron is a simple, elegant, stand-alone validation library with NO dependencies
+10 stars
from 1,588 · score 2.40
34.marshmallow-code / webargs
A friendly library for parsing HTTP request arguments, with built-in support for popular web frameworks, including Flask, Django, Bottle, Tornado, Pyramid, webapp2, Falcon, and aiohttp.
+10 stars
from 1,401 · score 2.40
35.bids-standard / bids-validator
Validator for the Brain Imaging Data Structure
+10 stars
from 41 · score 2.40
36.fabian-hiller / modular-forms
The modular and type-safe form library for SolidJS, Qwik and Preact
+9 stars
from 1,203 · score 2.30
37.redux-form / redux-form
A Higher Order Component using react-redux to keep form state in a Redux store
+8 stars
from 12,464 · score 2.20
38.mcs07 / MolVS
Molecule Validation and Standardization
+8 stars
from 181 · score 2.20
39.imbrn / v8n
☑️ JavaScript fluent validation library
+7 stars
from 4,134 · score 2.08
40.didww / credit_card_validations
:credit_card: ruby gem for validating credit cards, generating credit card numbers, Luhn checks
+7 stars
from 262 · score 2.08
41.Mirkoddd / Sift
A Fluent Regex Builder for Java
+6 stars
from 88 · score 1.95
42.JunggiKim / java-refined
Refinement and functional value types for Java 8+
+6 stars
from 2 · score 1.95
43.thedevsaddam / govalidator
Validate Golang request data with simple rules. Highly inspired by Laravel's request validation.
+5 stars
from 1,339 · score 1.79
44.truemail-rb / truemail-go
🚀 Configurable Golang 📨 email validator/verifier. Verify email via Regex, DNS, SMTP and even more. Be sure that email address valid and exists.
+4 stars
from 132 · score 1.61
45.apiaryio / dreddArchived
Language-agnostic HTTP API Testing Tool
+3 stars
from 4,211 · score 1.39
46.checkout / frames-ios
Frames iOS: making native card payments simple
+3 stars
from 103 · score 1.39
47.sinanbozkus / FormHelper
ASP.NET Core - Transform server-side validations to client-side without writing any javascript code. (Compatible with Fluent Validation)
+2 stars
from 287 · score 1.10
48.antonagestam / phantom-types
Phantom types for Python.
+2 stars
from 233 · score 1.10
49.vertti / daffy
Lightweight DataFrame validation decorators for Pandas, Polars, Modin, and PyArrow. No custom types required.
+2 stars
from 58 · score 1.10
50.Meteor-Community-Packages / meteor-collection2
A Meteor package that extends Mongo.Collection to provide support for specifying a schema and then validating against that schema when inserting and updating.
+1 stars
from 1,015 · score 0.69
51.jagi / meteor-astronomy
Model layer for Meteor
+1 stars
from 600 · score 0.69
52.neuledge / engine-jsArchived
⚡️ Neuledge streamlines database modeling with clear data entity definitions, customizable validation, and advanced business-logic representation.
+1 stars
from 234 · score 0.69
53.rluders / httpsuite
A Go library to simplify request parsing, validation, and response handling in microservices, making code cleaner and more maintainable.
+1 stars
from 42 · score 0.69
54.fulldecent / github-pages-template
An opinionated starting point and build system for awesome, collaboratively-edited HTML websites
+1 stars
from 40 · score 0.69
55.mmontone / clavier
:heavy_check_mark: General purpose validation library for Common Lisp
+1 stars
from 27 · score 0.69