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Employer Identification Number validator and masker
OpenAPI 3 mock server. Validates SDKs against OpenAPI specs with clear error attribution.
Detect and validate credit card numbers.
An utility to validate events and responses using JSON Schemas
A simple react form validator inspired by Laravel validation.
mashup of lodash with checkit module
OpenAPI request, parameters, headers and response validator methods
A lightweight utility for validating Stacks (STX) addresses and transaction IDs with TypeScript support.
AdiaUI A2UI validator — JSON Schema structural validation plus catalog-aware semantic validation (component exists, props match YAML). Split out from the compose engine so non-compose tooling (tests, MCP validator tools, CI gates) can depend on validation
TypeScript definitions for vnu-jar
Library for checking spaces in files
JavaScript client for the System program
BIC (Business Identifier Code) format validator
Wallet address validator for Bitcoin and other Altcoins.
Validate OpenApi specifications against their JSON schema
Additional JSON-Schema keywords for Ajv JSON validator
[Mustache](https://www.npmjs.com/package/mustache) doesn't validate the data used in templates which means there is a low amount of safety when the data is managed/defined in another place or there are typos, e.g. for the following:
Validator component for Vue.js
Validate CSS via W3C's service
Syntactically validates bundle structure and signatures.
A package for validating slate objects
Check the markup validity of HTML files using the W3C validator
A module that offers validation and parsing for non-standard UIDL structures