express-validation is a middleware that validates a request and returns a response with errors; if any of the configured validation rules fail.

File Type Validation Plugin for FilePond

Function argument validation for humans

TypeScript-first schema declaration and validation library with static type inference

Haraka plugin that validates and routes mail based on recipient domain or address

A collection of MCP test servers including working servers (ping, resource, combined, env-echo) and test failure cases (broken-tool, crash-on-startup)

No-dependencies, low-level, high-performance JIT code generation package for JavaScript

General purpose validation library for JavaScript

Create High Level Multi-Language Web Site [Fast and Easy]

File Size Validation Plugin for FilePond

This package provides utilities for creating schema for different types, along with serialization information.

Write Once, Observe Anywhere

Fork of the class-validator package. Decorator-based property validation for classes.

Core libraries to interact with SFDX projects, orgs, and APIs.

MJML: the only framework that makes responsive-email easy

Sanity template validator for remote templates

GraphQL Code Generator plugin to generate form validation schema from your GraphQL schema

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

Add-on to jQuery Validation to enable unobtrusive validation options in data-* attributes.

More powerful alternative to Animated library for React Native.