yup

Validate data against Yup schemas with chainable rules and TypeScript inference.

Updated Apr 12, 2026
One-click install
npx skills add https://github.com/gil00pita/lanify --skill yup-gil00pita
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: yup
Source: https://github.com/gil00pita/lanify/tree/main/.agents/skills/yup
Command: npx skills add https://github.com/gil00pita/lanify --skill yup-gil00pita

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Yup provides a fluent, chainable schema validation API for JavaScript and TypeScript, enabling robust form validation and type inference with minimal boilerplate. It helps ensure data integrity across client and server boundaries by defining explicit validation rules and schemas that can be reused across components.

Core Features & Use Cases

  • Fluent schema building with chainable validators for strings, numbers, booleans, dates, arrays, and objects.
  • Type inference via TypeScript to derive FormData types from schemas, plus integration with React Hook Form and Formik.
  • Schema composition, conditional validation, custom tests, and error handling for complex form validation scenarios.
  • Real-world use: validate user registration data, enforce password rules, and sanitize user input across a React app.

Quick Start

Define a Yup schema and validate a data object to ensure it matches the schema.

Frequently Asked Questions about yup

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate form data in React using a schema definition?

React form validation with Yup uses a fluent, chainable schema API to validate user input and enforce data integrity. It supports TypeScript type inference and integrates smoothly with React Hook Form and Formik to handle complex validation scenarios.

Can I derive TypeScript types from my validation schemas?

Yes, Yup provides TypeScript type inference to derive FormData types directly from defined schemas. This allows you to enforce data integrity and maintain strict type safety across client and server boundaries with minimal boilerplate.

Does Yup work with React Hook Form and Formik?

Yes, Yup integrates with React Hook Form and Formik to provide robust form validation. By defining explicit validation rules and schemas, it helps ensure data integrity across client and server boundaries and allows schema reuse across components.

How do I handle complex validation patterns like custom rules and conditional logic?

Yup handles complex validation patterns through schema composition, conditional validation rules, and custom tests. These features allow you to enforce specific password rules, validate user registration data, and manage error handling for complex form validation scenarios.

What is the best way to sanitize user input across a TypeScript app?

The best way to sanitize user input in TypeScript is by defining explicit validation schemas using a fluent, chainable API. This approach ensures data integrity across client and server boundaries by validating data objects and enforcing structured rules.

When should I not use a fluent schema validation library for forms?

You should avoid fluent schema validation if your project cannot accommodate external dependencies or does not require complex validation patterns. It is designed for robust data integrity scenarios requiring explicit rule definitions, schema composition, and TypeScript type inference.