1.pydantic / pydantic
Data validation using Python type hints
+900 stars
from 28,366 · score 6.80
Trending repositories
Ranked by Attention Score: stars gained over the last 90 complete days
54 repositories by Attention Score · Aug 5, 2026 – Nov 2, 2026 (UTC)
2.567-labs / instructor
structured outputs for llms
+452 stars
from 13,636 · score 6.12
3.react-hook-form / react-hook-form
📋 React Hooks for form state management and validation (Web + React Native)
+216 stars
from 44,682 · score 5.38
4.open-circle / valibot
The modular and type safe schema library for validating structural data 🤖
+213 stars
from 8,841 · score 5.37
5.go-playground / validator
:100:Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
+180 stars
from 20,035 · score 5.20
6.json-schema-org / json-schema-spec
The JSON Schema specification
+125 stars
from 5,080 · score 4.84
7.apple / pkl
A configuration as code language with rich validation and tooling.
+105 stars
from 11,450 · score 4.66
8.unionai-oss / pandera
A light-weight, flexible, and expressive statistical data testing library
+102 stars
from 4,405 · score 4.63
9.typestack / class-validator
Decorator-based property validation for classes.
+58 stars
from 11,795 · score 4.08
10.AfterShip / email-verifier
:white_check_mark: A Go library for email verification without sending any emails.
+58 stars
from 1,592 · score 4.08
11.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.
+48 stars
from 4,107 · score 3.89
12.validatorjs / validator.js
String validation
+45 stars
from 23,701 · score 3.83
13.python-jsonschema / jsonschema
An implementation of the JSON Schema specification for Python
+34 stars
from 4,960 · score 3.56
14.metosin / malli
High-performance data-driven data specification library for Clojure/Script.
+27 stars
from 1,748 · score 3.33
15.Propaganistas / Laravel-Phone
Phone number functionality for Laravel
+26 stars
from 3,014 · score 3.30
16.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
+21 stars
from 7,224 · score 3.09
17.hapijs / joi
The most powerful data validation library for JS
+20 stars
from 21,147 · score 3.04
18.logaretm / vee-validate
✅ Painless Vue forms
+19 stars
from 11,241 · score 3.00
19.cakephp / cakephp
CakePHP: The Rapid Development Framework for PHP - Official Repository
+19 stars
from 8,770 · score 3.00
20.marmelroy / PhoneNumberKit
A Swift framework for parsing, formatting and validating international phone numbers. Inspired by Google's libphonenumber.
+19 stars
from 5,374 · score 3.00
21.remult / remult
Full-stack CRUD, simplified, with SSOT TypeScript entities
+18 stars
from 3,196 · score 2.94
22.Oudwins / zog
Go with Zod inspired simple schema validation
+18 stars
from 1,202 · score 2.94
23.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.
+13 stars
from 824 · score 2.64
24.Respect / Validation
The most awesome validation engine ever created for PHP
+12 stars
from 6,023 · score 2.56
25.FirelyTeam / firely-net-sdk
The official Firely .NET SDK for HL7 FHIR
+11 stars
from 929 · score 2.48
26.ealush / vest
Vest ✅ Declarative validations framework
+9 stars
from 2,660 · score 2.30
27.h2non / filetype
Fast, dependency-free Go package to infer binary file types based on the magic numbers header signature
+9 stars
from 2,294 · score 2.30
28.asaskevich / govalidator
[Go] Package of validators and sanitizers for strings, numerics, slices and structs
+8 stars
from 6,195 · score 2.20
29.pallets-eco / wtforms
A flexible forms validation and rendering library for Python.
+7 stars
from 1,576 · score 2.08
30.ianstormtaylor / superstruct
A simple and composable way to validate data in JavaScript (and TypeScript).
+6 stars
from 7,121 · score 1.95
31.imbrn / v8n
☑️ JavaScript fluent validation library
+5 stars
from 4,136 · score 1.79
32.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.
+5 stars
from 1,406 · score 1.79
33.fabian-hiller / modular-forms
The modular and type-safe form library for SolidJS, Qwik and Preact
+5 stars
from 1,207 · score 1.79
34.thedevsaddam / govalidator
Validate Golang request data with simple rules. Highly inspired by Laravel's request validation.
+4 stars
from 1,340 · score 1.61
35.mcs07 / MolVS
Molecule Validation and Standardization
+4 stars
from 185 · score 1.61
36.vlucas / valitron
Valitron is a simple, elegant, stand-alone validation library with NO dependencies
+3 stars
from 1,595 · score 1.39
37.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。
+3 stars
from 1,162 · score 1.39
38.didww / credit_card_validations
:credit_card: ruby gem for validating credit cards, generating credit card numbers, Luhn checks
+3 stars
from 266 · score 1.39
39.patrickbr / gtfstidy
A tool for checking, sanitizing and minimizing GTFS feeds.
+3 stars
from 147 · score 1.39
40.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.
+3 stars
from 133 · score 1.39
+3 stars
from 118 · score 1.39
42.bids-standard / bids-validator
Validator for the Brain Imaging Data Structure
+3 stars
from 48 · score 1.39
43.JunggiKim / java-refined
Refinement and functional value types for Java 8+
+3 stars
from 5 · score 1.39
44.antonagestam / phantom-types
Phantom types for Python.
+2 stars
from 233 · score 1.10
45.Mirkoddd / Sift
A Fluent Regex Builder for Java
+2 stars
from 92 · score 1.10
46.vertti / daffy
Lightweight DataFrame validation decorators for Pandas, Polars, Modin, and PyArrow. No custom types required.
+2 stars
from 58 · score 1.10
47.tiendc / go-validator
Intuitive validation library for Golang
+2 stars
from 32 · score 1.10
48.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
49.jagi / meteor-astronomy
Model layer for Meteor
+1 stars
from 600 · score 0.69
50.valit-stack / Valit
Valit is dead simple validation for .NET Core. No more if-statements all around your code. Write nice and clean fluent validators instead!
+1 stars
from 319 · score 0.69
51.sinanbozkus / FormHelper
ASP.NET Core - Transform server-side validations to client-side without writing any javascript code. (Compatible with Fluent Validation)
+1 stars
from 288 · 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.boraseoksoon / Throttler
One Line to throttle, debounce and delay: Say Goodbye to Reactive Programming such as RxSwift and Combine.
+1 stars
from 166 · 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