1.pydantic / pydantic
Data validation using Python type hints
+380 stars
from 28,886 · score 5.94
Trending repositories
Ranked by Attention Score: stars gained over the last 30 complete days
48 repositories by Attention Score · Oct 4, 2026 – Nov 2, 2026 (UTC)
2.567-labs / instructor
structured outputs for llms
+134 stars
from 13,954 · score 4.91
3.react-hook-form / react-hook-form
📋 React Hooks for form state management and validation (Web + React Native)
+59 stars
from 44,839 · score 4.09
4.go-playground / validator
:100:Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
+40 stars
from 20,175 · score 3.71
5.open-circle / valibot
The modular and type safe schema library for validating structural data 🤖
+38 stars
from 9,016 · score 3.66
6.json-schema-org / json-schema-spec
The JSON Schema specification
+38 stars
from 5,167 · score 3.66
7.unionai-oss / pandera
A light-weight, flexible, and expressive statistical data testing library
+37 stars
from 4,470 · score 3.64
8.apple / pkl
A configuration as code language with rich validation and tooling.
+25 stars
from 11,530 · score 3.26
9.AfterShip / email-verifier
:white_check_mark: A Go library for email verification without sending any emails.
+20 stars
from 1,630 · score 3.04
10.typestack / class-validator
Decorator-based property validation for classes.
+19 stars
from 11,834 · score 3.00
11.validatorjs / validator.js
String validation
+18 stars
from 23,728 · score 2.94
12.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.
+10 stars
from 4,145 · score 2.40
13.hapijs / joi
The most powerful data validation library for JS
+9 stars
from 21,158 · score 2.30
14.python-jsonschema / jsonschema
An implementation of the JSON Schema specification for Python
+9 stars
from 4,985 · score 2.30
15.cakephp / cakephp
CakePHP: The Rapid Development Framework for PHP - Official Repository
+8 stars
from 8,781 · score 2.20
16.remult / remult
Full-stack CRUD, simplified, with SSOT TypeScript entities
+8 stars
from 3,206 · score 2.20
17.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
+7 stars
from 7,238 · score 2.08
18.marmelroy / PhoneNumberKit
A Swift framework for parsing, formatting and validating international phone numbers. Inspired by Google's libphonenumber.
+7 stars
from 5,386 · score 2.08
19.ealush / vest
Vest ✅ Declarative validations framework
+7 stars
from 2,662 · score 2.08
20.logaretm / vee-validate
✅ Painless Vue forms
+6 stars
from 11,254 · score 1.95
21.Respect / Validation
The most awesome validation engine ever created for PHP
+6 stars
from 6,029 · score 1.95
22.Propaganistas / Laravel-Phone
Phone number functionality for Laravel
+6 stars
from 3,034 · score 1.95
23.metosin / malli
High-performance data-driven data specification library for Clojure/Script.
+6 stars
from 1,769 · score 1.95
24.h2non / filetype
Fast, dependency-free Go package to infer binary file types based on the magic numbers header signature
+4 stars
from 2,299 · score 1.61
25.FirelyTeam / firely-net-sdk
The official Firely .NET SDK for HL7 FHIR
+4 stars
from 936 · score 1.61
26.asaskevich / govalidator
[Go] Package of validators and sanitizers for strings, numerics, slices and structs
+3 stars
from 6,200 · score 1.39
27.imbrn / v8n
☑️ JavaScript fluent validation library
+3 stars
from 4,138 · score 1.39
28.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.
+3 stars
from 834 · score 1.39
29.cinar / checker
Zero-dependency Go input validation, in-place normalization, and JSON Schema generation from struct tags.
+3 stars
from 52 · score 1.39
30.thedevsaddam / govalidator
Validate Golang request data with simple rules. Highly inspired by Laravel's request validation.
+2 stars
from 1,342 · score 1.10
31.Oudwins / zog
Go with Zod inspired simple schema validation
+2 stars
from 1,218 · score 1.10
32.fabian-hiller / modular-forms
The modular and type-safe form library for SolidJS, Qwik and Preact
+2 stars
from 1,210 · score 1.10
33.antonagestam / phantom-types
Phantom types for Python.
+2 stars
from 233 · score 1.10
34.mcs07 / MolVS
Molecule Validation and Standardization
+2 stars
from 187 · score 1.10
35.ianstormtaylor / superstruct
A simple and composable way to validate data in JavaScript (and TypeScript).
+1 stars
from 7,126 · score 0.69
36.vlucas / valitron
Valitron is a simple, elegant, stand-alone validation library with NO dependencies
+1 stars
from 1,597 · score 0.69
37.pallets-eco / wtforms
A flexible forms validation and rendering library for Python.
+1 stars
from 1,582 · score 0.69
38.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
39.taoensso / truss
Micro toolkit for Clojure/Script errors
+1 stars
from 330 · score 0.69
40.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
41.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
42.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
43.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
44.vertti / daffy
Lightweight DataFrame validation decorators for Pandas, Polars, Modin, and PyArrow. No custom types required.
+1 stars
from 59 · score 0.69
45.bids-standard / bids-validator
Validator for the Brain Imaging Data Structure
+1 stars
from 50 · score 0.69
46.chrieke / geojson-invalid-geometry
🗺️ List of GeoJSON invalid geometry issues with example files
+1 stars
from 50 · score 0.69
47.tiendc / go-validator
Intuitive validation library for Golang
+1 stars
from 33 · score 0.69
48.JunggiKim / java-refined
Refinement and functional value types for Java 8+
+1 stars
from 7 · score 0.69