Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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Ajv
The fastest JSON Schema validator for Node.js and the browser, compiling schemas straight into executable validation code.
fast-xml-parser
Pure-JS XML parser, builder, and validator with no C/C++ bindings and no callbacks
validator.js
A dependency-free library of 100+ string validators and sanitizers for Node.js and the browser.
class-validator
Decorator-based property validation for TypeScript and JavaScript classes, on both Node.js and the browser.
Ink
React for CLIs — build and test interactive command-line apps using declarative, Flexbox-based components instead of manual stdout writes.
Valibot
Modular, type-safe schema validation library with bundle sizes starting under 1KB
@apidevtools/swagger-parser
Parses, validates, and dereferences Swagger 2.0 and OpenAPI 3.x specs in Node.js and browsers
micromark
The smallest 100% CommonMark-compliant markdown parser, with GFM and MDX support
express-validator
A chainable Express middleware that wraps validator.js to validate and sanitize incoming request data with minimal boilerplate.
validators
A Python library for validating strings — emails, URLs, IPs, and more — without defining a schema.
vee-validate
Template-based form validation library for Vue.js with Composition API support
why-did-you-render
Monkey-patches React to flag avoidable re-renders caused by unchanged props, state, or hooks.
jsonschema
A compliant, dependency-light Go library for compiling and validating JSON Schema across five draft versions, with rich hierarchical errors.
dom-to-image
Turn any DOM node into a PNG, JPEG, or SVG image using pure client-side JavaScript
Validator
Derive-macro struct validation for Rust, covering email, URL, length, range, and custom rules