hardening-forms-and-validation

Name: hardening-forms-and-validation
Availability: InStock
Author: somachak

Implements dual-side Zod validation with CSRF-protected Server Actions for forms.

Updated Apr 14, 2026

Search Tags:#zod #error-handling #ux #client-server #csrf #server-actions #form-validation

Ready to run

npx skills add https://github.com/somachak/claude-code-skills-db --skill hardening-forms-and-validation

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: hardening-forms-and-validation
Source: https://github.com/somachak/claude-code-skills-db/tree/main/skills/frontend/hardening-forms-and-validation
Command: npx skills add https://github.com/somachak/claude-code-skills-db --skill hardening-forms-and-validation

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Forms are a critical surface area that require robust client-side UX and secure server-side validation to prevent invalid submissions and data leaks.

Core Features & Use Cases

Client-side real-time validation for immediate feedback
Server-side validation with a single source of truth (Zod)
Server Actions with CSRF protection for robust, secure form submissions
Coverage for common flows such as login, signup, checkout, onboarding, and profile/settings management

Quick Start

Create a login form using a Zod schema on both client and server and submit via a Next.js Server Action with CSRF protection.

Frequently Asked Questions about hardening-forms-and-validation

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

FAQPage Schema

How do I validate forms on both client and server using a single source of truth?▼

Form validation across client and server boundaries requires a unified Zod schema acting as the single source of truth. This schema defines validation rules once, enabling real-time client-side UX feedback while ensuring secure server-side input handling.

How do I secure Next.js Server Actions against CSRF attacks during form submission?▼

Securing Next.js Server Actions against CSRF involves implementing POST requests via Server Actions with built-in CSRF protection. This approach hardens form submission endpoints, preventing cross-site request forgery and ensuring only legitimate form data is processed.

What is the best way to handle real-time form validation error messaging in React?▼

Real-time form validation error messaging in React relies on immediate client-side feedback driven by a Zod schema. This provides users with instant input validation results, correcting invalid submissions before they reach the server boundary.

Does this form hardening approach work for complex flows like checkout and onboarding?▼

Form hardening applies to complex flows including checkout, onboarding, login, and signup. By leveraging Zod schemas and Server Actions, it delivers robust validation and secure data handling for high-stakes user interactions.

Why do I need Zod for server-side validation instead of just checking client inputs?▼

Zod is needed for server-side validation because client-side checks are easily bypassed. Using a Zod schema as a single source of truth guarantees secure input handling and robust data integrity directly within Next.js Server Actions.

Can I use this form validation approach without Next.js Server Actions?▼

This form validation approach relies on Next.js Server Actions for secure POST submissions and CSRF protection. While the Zod schema can validate inputs independently, the secure server boundary handling requires a Next.js environment.