Provider-agnostic core for Taiwan e-invoice: unified types, InvoiceProvider interface, validation schemas, and a MockProvider.

Grayhaven Nerve core: domain model, DSL builders, HIR types and schema, compiler interface, validation primitives.

MJML: the only framework that makes responsive-email easy

Blazing fast input validation and transformation ⚡

An implementation of the WHATWG URL Standard's URL API and parsing machinery

Wrap zod validation errors in user-friendly readable messages

Decorator-based property validation for classes.

runtime type checking and validation of untyped JSON data

OpenAPI 3 and 3.1 schema generator and validator for Hono, itty-router and more!

Dead simple Object schema validation

Validate JSON

Extended validation plugin adds support for writing GraphQL validation rules, that has access to all `execute` parameters, including variables.

React Hook Form validation resolvers: Yup, Joi, Superstruct, Zod, Vest, Class Validator, io-ts, Nope, computed-types, TypeBox, arktype, Typanion, Effect-TS and VineJS

A ridiculously light-weight argument validator (now browser friendly)

Node validation utility functions for Docusaurus packages.

A TypeScript library for creating strongly typed mock data factories using Faker.js for test data generation

TLDS list for domain validation

Runtime library to validate data against TypeScript interfaces

Official CLI for Kubb. Run kubb generate, kubb init, kubb validate, kubb studio, and kubb mcp to manage the full code generation lifecycle.

Runtime validation and processing of JavaScript types