form-validation

Implement client-side form validation rules with accessible error messaging.

1|Updated Jan 13, 2026
One-click install
npx skills add https://github.com/velcrafting/codex-skills --skill form-validation-velcrafting
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: form-validation
Source: https://github.com/velcrafting/codex-skills/tree/main/skills/frontend/form-validation
Command: npx skills add https://github.com/velcrafting/codex-skills --skill form-validation-velcrafting

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Implement consistent client-side form validation and accessible error UX across forms to reduce user friction and submission errors.

Core Features & Use Cases

  • Validation rules: required fields, format constraints, and value ranges aligned with repo conventions.
  • Accessible error messaging: inline errors with aria-describedby and screen-reader friendly text.
  • Submit safety: disable submit while processing and prevent duplicate submissions.
  • Use Case: Apply to a sign-up form to enforce password rules and real-time feedback.

Quick Start

Integrate the form-validation pattern into your frontend forms to apply standard rules and UX instantly.

Frequently Asked Questions about form-validation

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

FAQPage Schema
How do I implement client-side form validation with accessible error messaging?

Client-side form validation enforces required fields, format constraints, and value ranges with accessible error messaging using inline errors and screen-reader friendly text. It applies validation rules across route components to reduce user friction and submission errors.

What's the best way to prevent duplicate submissions on frontend forms?

Submit safety prevents duplicate submissions by disabling the submit button while processing. This client-side form validation pattern ensures users cannot trigger multiple concurrent submissions during async operations.

How do I map server errors to client-side form fields?

Client-side form validation maps server errors by aligning with existing repo conventions. It matches server validation responses to specific form fields, displaying accessible inline errors via aria-describedby for consistent UX.

How do I enforce password rules with real-time feedback in a sign-up form?

Form validation enforces password rules with real-time feedback by applying format constraints and value ranges to sign-up form fields. It provides immediate, accessible error messaging to guide users before submission.

Does form validation work without external dependencies?

Yes, client-side form validation works without external dependencies. It implements validation rules, accessible error UX, and submit safety directly within your frontend project, aligning with existing repo patterns rather than requiring additional libraries.

How do I align form validation rules with existing repo conventions?

Form validation aligns with repo conventions by mapping existing patterns across route components and form fields. It enforces required, format, and range constraints while ensuring the implementation satisfies established project standards for accessibility and submit safety.